Foods

34 pages, 1928 KB

Open AccessArticle

The Development and Testing of a Temporary Small Cold Storage System: Gas-Inflated Membrane Cold Storage

by Lihua Duan, Xiaoyan Zhuo, Jiajia Su, Xiaokun Qiu, Limei Li, Wenhan Li, Yaowen Liu and Xihong Li

Foods 2026, 15(2), 231; https://doi.org/10.3390/foods15020231 - 8 Jan 2026

Abstract

At present, conventional cold storage facilities in China are poorly suited to on-farm storage demands for agricultural produce, mainly due to their large spatial requirements, complex and labor-intensive installation procedures, limited portability, and insufficient coverage in rural areas. These limitations significantly contribute to [...] Read more.

At present, conventional cold storage facilities in China are poorly suited to on-farm storage demands for agricultural produce, mainly due to their large spatial requirements, complex and labor-intensive installation procedures, limited portability, and insufficient coverage in rural areas. These limitations significantly contribute to post-harvest losses of perishable crops such as cherry tomatoes. To address this challenge, the present study proposes a compact and temporary cold storage system—gas-inflated membrane cold storage (GIMCS)—which exploits the inherent safety, cost-effectiveness, ease of deployment, and adaptability of inflatable membrane structures. A series of mechanical performance tests, including tensile strength, pressure resistance, and burst tests, were conducted on PA/PE (Polyamide/Polyethylene) composite membranes. The optimal configuration was identified as a membrane thickness of 70 μm, a gas column width of 2 cm, and a PA/PE composition ratio of 35%/65%. Thermal performance evaluations further revealed that filling the inflatable structure with 100% CO₂ yielded the most effective insulation. Through structural optimization, a cotton-filled gas-inflated membrane cold storage system (CF-GIMCS) incorporating a dual insulation strategy—combining intra-membrane and extra-membrane insulation—was developed. This multilayer configuration significantly reduced conductive and convective heat transfer, resulting in enhanced thermal performance. A comparative evaluation between GIMCS and a conventional cold storage system of equivalent capacity was conducted over a 15-day storage period, considering construction cost, temperature uniformity, and fruit preservation quality. The results showed that the construction cost of GIMCS was only 38% of that of conventional cold storage. The internal temperature distribution of GIMCS was highly uniform, with a maximum horizontal temperature difference of 1.4 °C, demonstrating thermal stability comparable to conventional systems. No statistically significant differences were observed between the two systems in key post-harvest quality indicators, including weight loss and respiration rate. Notably, GIMCS exhibited superior performance in maintaining fruit firmness, with a hardness of 1.30 kg·cm⁻² compared to 1.26 kg·cm⁻² in conventional storage, indicating a potential advantage in shelf-life extension. Overall, these findings demonstrate that GIMCS represents an affordable, technically robust, and portable cold storage solution capable of delivering preservation performance comparable to—or exceeding—that of conventional cold storage. Its modularity, mobility, and ease of relocation make it particularly well suited to the operational and economic constraints of smallholder farming systems, offering a practical and scalable pathway for improving on-farm cold chain infrastructure. Full article

(This article belongs to the Special Issue Food Packaging and Preservation Technologies for Improving Fresh Product Shelf Life)

18 pages, 2961 KB

Open AccessArticle

Enhancing Spore Inactivation: Low-Intensity Pulsed Electric Field Combined with Ohmic Heating and Germinant Pretreatment

by Fei-Yue Xu, Hua-Xi Huang, Qing-Hui Wen, Lang-Hong Wang, Yan-Yan Huang and Man-Sheng Wang

Foods 2026, 15(2), 230; https://doi.org/10.3390/foods15020230 - 8 Jan 2026

Abstract

Bacterial spores, as one of the most resistant microbial forms, are difficult to completely eliminate through conventional heat treatments such as pasteurization, allowing them to persist in food and pose a significant threat to microbial safety. This study employed a “germination–inactivation” strategy to [...] Read more.

Bacterial spores, as one of the most resistant microbial forms, are difficult to completely eliminate through conventional heat treatments such as pasteurization, allowing them to persist in food and pose a significant threat to microbial safety. This study employed a “germination–inactivation” strategy to inactivate Alicyclobacillus acidoterrestris (AAT) spores using a germinant under low-intensity pulsed electric fields (PEFs). Analysis of germination curves identified 40 mM L-valine as the most effective germinant. Results showed that after 4-h incubation with 40 mM L-valine followed by 210 s of 0.18 kV/cm PEF treatment, the synergistic effect of electric field and ohmic heating (OH) reduced AAT spore counts by 1.73 log units. In contrast, the control group treated with the same PEF parameters without a germinant showed only a 0.54 log unit reduction. These findings indicate that germination agents significantly reduce spore resistance. Subsequent experiments confirmed that L-valine-treated AAT spores underwent pronounced structural disruption under the combined effects of the electric field and OH, leading to leakage of intracellular components such as nucleic acids and proteins. This phenomenon was verified via scanning electron microscopy (SEM) and laser confocal microscopy. Additionally, both ROS levels and ATPase activity in spores were substantially reduced, further indicating that the combined electric field and OH synergistically disrupted the spore’s external structure and internal macromolecules, leading to spore death. Thus, low-intensity PEF assisted by spore germination agents offers an energy-efficient and effective inactivation method, opening new avenues for spore inactivation research. Full article

(This article belongs to the Special Issue Advances in Thermal and Non-Thermal Processing: Focus on Food Quality Changes)

21 pages, 2625 KB

Open AccessArticle

Enhancing the Signature Rose Aroma of Kluyveromyces marxianus-Fermented Milk Beer via Adaptive Laboratory Evolution

by Chen Xing, Youming Tan, Xinchi Jiang, Wenlu Li, Qihao Wang, Zihao Liu, Hong Zeng and Yanbo Wang

Foods 2026, 15(2), 229; https://doi.org/10.3390/foods15020229 - 8 Jan 2026

Abstract

Milk beer, a modern Chinese dairy beverage, is usually fermented by the co-culture of lactic acid bacteria (LAB) and Kluyveromyces marxianus (K. marxianus), with the latter known for its ability to produce aroma compounds. However, the accumulation of lactic acid produced [...] Read more.

Milk beer, a modern Chinese dairy beverage, is usually fermented by the co-culture of lactic acid bacteria (LAB) and Kluyveromyces marxianus (K. marxianus), with the latter known for its ability to produce aroma compounds. However, the accumulation of lactic acid produced by LAB can inhibit the growth of K. marxianus, which inevitably hinders the diversity and intensity of flavor compounds in milk beer. In this study, adaptive laboratory evolution (ALE) was applied to the parental strain Kluyveromyces marxianus CICC1953 (Km-P) under different concentrations of lactic acid to obtain an evolved strain Km-ALE-X20 with enhanced acid tolerance and increased titer of phenylethyl alcohol, which has a floral, rose-like aroma. Km-ALE-X20 demonstrated a 16-fold increase in OD₆₀₀ and a 28-fold increase in phenylethyl alcohol production compared with Km-P in chemically defined medium (CDM) containing 20 g/L lactic acid. Comparative genomics analysis suggested that mutated genes CTA1, TSL1, ERG2 were related to enhanced acid tolerance, while ARO8, ARO9, FKS2 were related to increased production of aroma compounds. Furthermore, Km-ALE-X20-fermented milk beer showed 33.87% and 32.43% higher production in alcohol and ester compounds than that of Km-P-fermented milk beer. Interestingly, sensory analysis showed that while Km-ALE-X20-fermented milk beer had higher sensory scores for rose and fruity aroma attributes, Km-P-fermented milk beer possessed a more balanced aroma profile. This paper highlights the first application of ALE to enhance the signature rose aroma of K. marxianus-fermented milk beer and provides an efficient framework for ALE-based breeding of aroma-producing food microorganisms. Full article

(This article belongs to the Section Food Microbiology)

19 pages, 2403 KB

Open AccessArticle

Glutamine Modulates mVOC Biosynthesis in Streptomyces alboflavus Through a gluR-Dependent Signaling Pathway and Enhances Its Inhibitory Activity Against Aspergillus flavus

by Wangqiang Li, Mingguan Yang, Zehua Dong, Tong Liu, Xiuyu Liu, Dan Liu, Chengfang Ding, Laifeng Lu, Wentao Ding, Zhenjing Li, Huanhuan Liu, Zhifang Wang, Qingbin Guo and Changlu Wang

Foods 2026, 15(2), 228; https://doi.org/10.3390/foods15020228 - 8 Jan 2026

Abstract

Aspergillus flavus and its aflatoxins pose serious threats to human and animal health, negatively affecting agricultural productivity and the global economy. Although chemical preservatives are widely used, their effectiveness remains limited by increased fungal resistance and environmental concerns, highlighting the need for sustainable [...] Read more.

Aspergillus flavus and its aflatoxins pose serious threats to human and animal health, negatively affecting agricultural productivity and the global economy. Although chemical preservatives are widely used, their effectiveness remains limited by increased fungal resistance and environmental concerns, highlighting the need for sustainable alternatives. Microbial volatile organic compounds (mVOCs) represent a promising biocontrol strategy. Here, we investigate how glutamine regulates mVOC biosynthesis in Streptomyces alboflavus TD-1 and enhances its antifungal activity against A. flavus. Antifungal assays showed that supplementation with 40 mM glutamine significantly enhanced inhibitory activity, leading to 69.0% inhibition of conidial germination and 64.5% inhibition of mycelial biomass. Transcriptome profiling identified 283 differentially expressed genes, including the two-component system regulator gluR, which was strongly upregulated. CRISPR/Cas9-mediated disruption of gluR confirmed its regulatory role. Specifically, the mutant strain produced reduced levels of antifungal mVOCs, such as dimethyl trisulfide and o-anisidine, and exhibited diminished inhibition of A. flavus. Collectively, these findings demonstrate that exogenous glutamine enhances the mVOC-mediated suppression of A. flavus by S. alboflavus TD-1 through nutrient-sensing and transcriptional regulation of volatile biosynthesis. Although aflatoxin levels were not quantified in this study, the enhanced growth inhibition and the identified mVOC shifts provide a mechanistic basis for future studies that directly quantify aflatoxin production under storage-relevant conditions. Full article

(This article belongs to the Section Food Quality and Safety)

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15 pages, 3127 KB

Open AccessArticle

Optimization of the Probiotic Fermentation Process of Ganoderma lucidum Juice and Its In Vitro Immune-Enhancing Potential

by Dilireba Shataer, Xin Liu, Yanan Qin, Jing Lu, Haipeng Liu and Liang Wang

Foods 2026, 15(2), 227; https://doi.org/10.3390/foods15020227 - 8 Jan 2026

Abstract

Fermented products have recently garnered substantial interest in both research and commercial contexts. Although probiotic fermentation is predominantly practiced with dairy, fruits, vegetables, and grains, its application to dual-purpose food-medicine materials like Ganoderma lucidum has been comparatively underexplored. In this study, Ganoderma lucidum [...] Read more.

Fermented products have recently garnered substantial interest in both research and commercial contexts. Although probiotic fermentation is predominantly practiced with dairy, fruits, vegetables, and grains, its application to dual-purpose food-medicine materials like Ganoderma lucidum has been comparatively underexplored. In this study, Ganoderma lucidum fermented juice (GFJ) served as the substrate and was fermented with five probiotic strains. The optimal inoculation ratios—determined by employing a uniform design experiment—were as follows: Bifidobacterium animalis 6.05%, Lacticaseibacillus paracasei 9.52%, Lacticaseibacillus rhamnosus 6.63%, Pediococcus pentosaceus 21.38%, and Pediococcus acidilactici 56.42%. Optimal fermentation parameters established by response surface methodology included 24 h of fermentation at 37 °C, a final cell density of 5 × 10⁶ CFU/mL, and a sugar content of 4.5 °Brix. Experiments with RAW264.7 macrophages revealed that GFJ significantly promoted both phagocytic activity and nitric oxide (NO) secretion, indicating enhanced immune characteristics as a result of fermentation. Untargeted metabolomics profiling of GFJ across different fermentation stages showed upregulation of functional metabolites, including polyphenols, prebiotics, functional oligosaccharides, and Ganoderma triterpenoids (GTs)—notably myricetin-3-O-rhamnoside, luteolin-7-O-glucuronide, raffinose, sesamose, and Ganoderma acids. These increments in metabolic compounds strongly correlate with improved functional properties in GFJ, specifically heightened superoxide dismutase activity and immunomodulatory capacity. These results highlight an effective approach for developing functionally enriched fermented products from medicinal fungi, with promising applications in functional food and nutraceutical industries. Full article

(This article belongs to the Section Food Nutrition)

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16 pages, 1943 KB

Open AccessArticle

Evaluation of the Sensory and Textural Properties of Cheese-Containing Frankfurters Available on the Polish Market

by Kacper Kozłowski, Michał Piątek, Mirosława Krzywdzińska-Bartkowiak and Agnieszka Bilska

Foods 2026, 15(2), 226; https://doi.org/10.3390/foods15020226 - 8 Jan 2026

Abstract

The increasing trend in the consumption of milk and dairy products, as well as meat and meat-derived products, may be one of the factors contributing to the growing popularity of cheese-added frankfurters, which combine these two product categories. The aim of this study [...] Read more.

The increasing trend in the consumption of milk and dairy products, as well as meat and meat-derived products, may be one of the factors contributing to the growing popularity of cheese-added frankfurters, which combine these two product categories. The aim of this study was to compare the textural, colour, and sensory properties of commercially available cheese-containing frankfurters using instrumental measurements and descriptive sensory analysis. The study focused on ready-to-eat products with naturally varying formulations to identify measurable differences in quality attributes and explore potential associations between composition and product characteristics. Instrumental methods were applied, including texture profile analysis (TPA), the Warner–Bratzler shear force test (WBSF), and CIE L*a*b* colour measurement, along with quantitative descriptive analysis. The results confirmed significant differences between the samples in terms of texture and flavour. Notably, Sample B showed the highest shear force (2.91 N), while Sample C exhibited the lowest (1.82 N). Samples A and D, both containing 12% processed cheddar cheese, had the highest b* values (30.1 and 22.4, respectively), which corresponded to their more intense yellow colour and higher scores for cheese flavour. The addition of cheese had a beneficial effect on product acceptability; however, the final outcome depended on the form and amount of cheese, as well as other ingredients. These findings suggest that cheese may serve as a valuable additive to homogenised meat products, enhancing sensory appeal without compromising technological quality. Future studies will compare different cheese types and concentrations and include consumer testing on a larger sample. Full article

(This article belongs to the Special Issue Nutritional and Health Quality of Traditional and Innovative Processed Meats)

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18 pages, 9001 KB

Open AccessArticle

Nanoparticles for Synergistic Delivery of Curcumin and Quercetin Based on Zein and Sodium Caseinate: Preparation, Characterization, and Intestinal Absorption

by Yingxi Li, Renli Shi, Zhiyue Xu, Tianyi Huang, Sitong Wang, Yaxin Sang, Marcos A. Neves, Wenlong Yu and Xianghong Wang

Foods 2026, 15(2), 225; https://doi.org/10.3390/foods15020225 - 8 Jan 2026

Abstract

The purpose of the study was to characterize the basic structure of nanoparticles (Zein-CS-Cur-Que) embedded in curcumin and quercetin, realize the synergistic antioxidant of dietary polyphenols, and improve the transmembrane transport rate and bioavailability of curcumin. The oral delivery system Zein-CS-Cur-Que developed based [...] Read more.

The purpose of the study was to characterize the basic structure of nanoparticles (Zein-CS-Cur-Que) embedded in curcumin and quercetin, realize the synergistic antioxidant of dietary polyphenols, and improve the transmembrane transport rate and bioavailability of curcumin. The oral delivery system Zein-CS-Cur-Que developed based on the synergistic encapsulation of curcumin and quercetin using the anti-solvent method with corn alkyd-soluble proteins and sodium caseinate possessed varying nanoparticle sizes (173.96–191.03 nm) and good dispersibility (PDI < 0.17), and relied on electrostatic interactions, hydrogen bonding, and hydrophobic interactions to successfully encapsulate curcumin (94.62%) and quercetin (73.75%). The results showed that Zein-CS-Cur-Que enhanced the stability and antioxidant activity of curcumin, and increased the bioaccessibility (nearly 2-fold) and rate of translocation (nearly 2-fold) of curcumin in the gastrointestinal tract significantly. Therefore, the nanocomposite system developed in this study is crucial for the development of functional foods and dietary supplements, providing effective insights into the synergy of polyphenol interactions. Full article

(This article belongs to the Special Issue Potential Health Benefits of Plant Food-Derived Bioactive Compounds: 2nd Edition)

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13 pages, 646 KB

Open AccessArticle

Quality Assessment and Physicochemical Characteristics of Commercial Frozen Vegetable Blends Available on the Polish Market

by Joanna Markowska, Anna Drabent and Natalia Grzybowska

Foods 2026, 15(2), 224; https://doi.org/10.3390/foods15020224 - 8 Jan 2026

Abstract

Frozen vegetables are increasingly valued for their nutritional stability and year-round availability. This study provides a comprehensive assessment of twenty commercially available frozen vegetable blends obtained from retail markets in Poland. Analyses included physicochemical parameters, instrumental measurements of texture, color (CIEL*a*b*), and evaluation [...] Read more.

Frozen vegetables are increasingly valued for their nutritional stability and year-round availability. This study provides a comprehensive assessment of twenty commercially available frozen vegetable blends obtained from retail markets in Poland. Analyses included physicochemical parameters, instrumental measurements of texture, color (CIEL*a*b*), and evaluation of technological quality. The pH values ranged from 4.40 to 7.46, total acidity from 0.034 to 0.322 g/100 g, and dry matter content from 5.02 to 42.97%. The observed variability was mainly attributable to vegetable type and remained consistent with values reported for fresh produce, indicating that industrial freezing largely preserves chemical characteristics. Texture differed markedly between vegetable types, with hardness values ranging from 6 to nearly 100 N, while color parameters remained within typical ranges for blanched and frozen vegetables, suggesting effective pigment stability and enzyme inactivation. In contrast, substantial variability was observed in technological quality. Mechanical fragmentation exceeded acceptable limits in 30% of samples, and complete clumping of vegetable pieces (100%) was observed. Additional defects included frostbite and color deviations, and health-condition defects were observed. These results highlight considerable heterogeneity in frozen vegetable blends and emphasize the need for stricter control of raw materials, processing conditions, and cold-chain management to ensure consistent quality and consumer safety. Full article

(This article belongs to the Section Food Quality and Safety)

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20 pages, 901 KB

Open AccessArticle

Explainable Transformer-Based Modelling for Pathogen-Oriented Food Safety Inspection Grade Prediction Using New York State Open Data

by Omer Faruk Sari, Mohamed Bader-El-Den and Volkan Ince

Foods 2026, 15(2), 223; https://doi.org/10.3390/foods15020223 - 8 Jan 2026

Abstract

Foodborne pathogens remain a major public health concern, and the early identification of unsafe conditions is essential for preventive control. Routine inspections generate rich textual and structured data that can support real-time assessment of pathogen-related risk. The objective of this study is to [...] Read more.

Foodborne pathogens remain a major public health concern, and the early identification of unsafe conditions is essential for preventive control. Routine inspections generate rich textual and structured data that can support real-time assessment of pathogen-related risk. The objective of this study is to develop an explainable transformer-based framework for predicting food safety inspection grades using multimodal inspection data. We combine structured metadata with unstructured deficiency narratives and evaluate classical machine learning models, deep learning architectures, and transformer models. RoBERTa achieved the highest performance (F1 = 0.96), followed by BiLSTM (F1 = 0.95) and LightGBM (F1 = 0.92). SHapley Additive exPlanations (SHAP) analysis revealed linguistically meaningful indicators of pathogen-related hazards such as temperature abuse, pests, and unsanitary practices. The findings demonstrate that transformer-based models, combined with explainable AI (XAI), can support pathogen-oriented monitoring and real-time risk assessment. This study highlights the potential of multimodal AI approaches to enhance inspection efficiency and strengthen public health surveillance. Full article

(This article belongs to the Special Issue Machine Learning-Driven Strategies for Pathogen Detection and Food Safety Management)

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32 pages, 2496 KB

Open AccessArticle

Intercultural Dialogue Begins at the Dining Table: A Unilateral Kosovo Perspective on Turkish–Kosovar Fusion Cuisine

by Ceyhun Uçuk, Çağın Çevik, Onurcan Arman and Charles Spence

Foods 2026, 15(2), 222; https://doi.org/10.3390/foods15020222 - 8 Jan 2026

Abstract

Fusion cuisine blends ingredients, cooking techniques, and flavours from different cultures, yet little is known about how it is perceived within the context of gastrodiplomacy. This study explores perceptions of fusion cuisine at a multicultural gastrodiplomacy event held in Kosovo, where the participants [...] Read more.

Fusion cuisine blends ingredients, cooking techniques, and flavours from different cultures, yet little is known about how it is perceived within the context of gastrodiplomacy. This study explores perceptions of fusion cuisine at a multicultural gastrodiplomacy event held in Kosovo, where the participants first sampled Turkish–Kosovar fusion dishes during tasting sessions and subsequently completed an online questionnaire designed to assess their experience. In this event, participants attended structured tasting activities in Prizren and Pristina, where they sampled dishes combining elements of both culinary traditions, and then completed an online structured questionnaire consisting of 5-point Likert-type items evaluating their fusion cuisine preferences. The study was conducted in Kosovo as part of a unilateral gastrodiplomatic initiative. A total of 451 participants responded to an online questionnaire, which included fusion cuisine preference scores and metaphorical descriptions of their culinary experiences. A key contextual characteristic of this study is that data were collected exclusively during a fusion cuisine event held in Kosovo, with participation from a multinational audience who attended the event. Therefore, the sample reflects diverse cultural backgrounds within a single-location setting. The results indicate that younger, highly educated, and higher-income participants exhibited significantly greater openness to culinary diversity. These findings advance the state of knowledge by demonstrating that public reception of gastrodiplomacy is stratified by socioeconomic factors rather than defined solely by national background. Practically, this implies that effective fusion-based diplomacy requires targeted strategies to bridge demographic gaps and ensure broader social inclusivity, rather than relying on a one-size-fits-all approach. Full article

(This article belongs to the Section Sensory and Consumer Sciences)

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20 pages, 5261 KB

Open AccessArticle

Preparation of Chitosan Composite Film Loaded with Chlorogenic Acid–Chitosan Oligosaccharide Nanoparticles and Its Application in Preservation of Pleurotus geesteranus

by Ning Xu, Liru Luo, Fang Wu, Dan Luo, Liguo Feng and Huan Lu

Foods 2026, 15(2), 221; https://doi.org/10.3390/foods15020221 - 8 Jan 2026

Abstract

To reduce the environmental impact of plastic packaging in the edible fungi supply chain, this study developed an edible natural chitosan composite film loaded with chlorogenic acid–chitosan oligosaccharide nanoparticles (CGA/COS NPs). The effects of CGA/COS NPs as additives on the structure and overall [...] Read more.

To reduce the environmental impact of plastic packaging in the edible fungi supply chain, this study developed an edible natural chitosan composite film loaded with chlorogenic acid–chitosan oligosaccharide nanoparticles (CGA/COS NPs). The effects of CGA/COS NPs as additives on the structure and overall performances of chitosan-based films were systematically studied, and the application effect of nanoparticles/chitosan (NPs/CS) composite films in the preservation of Pleurotus geesteranus was explored. The results showed that the NPs had good compatibility with the film matrix, filled the voids of the chitosan matrix, enhanced the comprehensive performance of the film, and significantly improved the antioxidant activity of the film (DPPH free radical scavenging activity increased from 16.95% to 76.47%). Among all the films, the 5%NPs/CS composite film performed the best, not only having stronger barrier properties against moisture, oxygen, and ultraviolet rays, but also having the best thermal stability and mechanical properties, which can effectively extend the shelf life of Pleurotus geesteranus. This study developed a high-performance edible composite film, which provides a new path of great value for solving the preservation problem of perishable agricultural products such as Pleurotus geesteranus and promoting the innovative development of the green food packaging industry. Full article

(This article belongs to the Section Food Packaging and Preservation)

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18 pages, 10204 KB

Open AccessArticle

Evolution of Jiang-Flavor Daqu’s Characteristics During Different Storage Stages and Influence on Simulated Brewing Fermentation

by Zihan Chen, Han Wang, Chongchao Wu, Xing Zheng, Guida Zhu, Jing Yu, Qiuxiang Tang and Ping Song

Foods 2026, 15(2), 220; https://doi.org/10.3390/foods15020220 - 8 Jan 2026

Abstract

Daqu quality plays a crucial role in the entire fermentation process of Baijiu. There is no empirical evidence for a scientific consensus on the storage period of Jiang-flavor Daqu and its quality evaluation. This study took Jiang-flavor Daqu from a liquor enterprise in [...] Read more.

Daqu quality plays a crucial role in the entire fermentation process of Baijiu. There is no empirical evidence for a scientific consensus on the storage period of Jiang-flavor Daqu and its quality evaluation. This study took Jiang-flavor Daqu from a liquor enterprise in Sichuan Province as the research object. It explored the changes in physicochemical indexes, microbial communities, and volatile flavor substances of the Daqu within 0–180 days of storage. Combined with simulated brewing experiments, it analyzed the effects of different storage periods of Daqu on fermented grain fermentation and the base wine quality and clarified the metabolic differences between Daqu stored for 30 days and 180 days by means of metabolomics. The results showed that the saccharification power and fermentation power of Daqu first increased and then stabilized, reaching 205 mg/g·h and 0.71 g/g·72, respectively, at 180 days. The microbial diversity first increased and then decreased, with Virgibacillus and Oceanobacillus alternately serving as the dominant bacteria. The flavor substances were more abundant within 60 days of storage, while the content of pyrazine compounds was the highest at 180 days. The wine yield of Daqu stored for 30 days was 2.26 times that of Daqu stored for 180 days. The brewing stage had the greatest impact on metabolites, and flavonoid synthesis was the key metabolic pathway. This study provides theoretical support for the scientific storage of Jiang-flavor Daqu and the standardization of its quality. Full article

(This article belongs to the Special Issue Brewing Microorganisms in Fermented Foods: Physiological Characteristics, Succession Patterns and Metabolic Functions)

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16 pages, 284 KB

Open AccessArticle

Nutritional Properties of Edible Flowers from Five Pumpkin (Cucurbita sp.) Species

by Małgorzata Stryjecka, Monika Jaroszuk-Sierocińska, Anna Kiełtyka-Dadasiewicz, Barbara Krochmal-Marczak and Tomasz Cebulak

Foods 2026, 15(2), 219; https://doi.org/10.3390/foods15020219 - 8 Jan 2026

Abstract

Edible pumpkin flowers represent a promising but still underutilized source of nutrients and bioactive compounds. Despite their traditional culinary use in various regions of the world, comprehensive studies comparing the nutritional and chemical composition of flowers from different Cucurbita species are limited. This [...] Read more.

Edible pumpkin flowers represent a promising but still underutilized source of nutrients and bioactive compounds. Despite their traditional culinary use in various regions of the world, comprehensive studies comparing the nutritional and chemical composition of flowers from different Cucurbita species are limited. This study conducted a detailed chemical analysis of flowers from five pumpkin species: Cucurbita maxima (giant pumpkin), C. pepo (summer squash), C. moschata (butternut squash), C. ficifolia (fig-leaf gourd), and C. argyrosperma (cushaw squash). The analyses included the determination of basic nutritional components, amino acids, minerals, vitamins, and fatty acid profiles using standard analytical methods (AOAC, ISO, and HPLC). Significant interspecific differences were observed. The flowers of butternut squash exhibited the highest protein and fat contents, while the flowers of cushaw squash contained the largest amounts of dietary fiber and total sugars. Flowers of giant pumpkin were distinguished by their elevated contents of vitamin C and β-carotene. Amino acid analysis revealed a rich protein profile, particularly in cushaw squash, characterized by high lysine and cysteine levels, whereas fig-leaf gourd contained the greatest amounts of leucine and isoleucine. The fatty acid composition was dominated by oleic, stearic, and myristic acids, while a considerable proportion of linoleic acid (PUFA) indicated potential health benefits, such as anti-inflammatory effects. Mineral analysis showed that giant pumpkin was richest in potassium, summer squash in zinc, and butternut squash in calcium and sodium. The findings confirm that pumpkin flowers are a valuable source of nutrients and bioactive compounds. Their composition highlights their potential as functional food ingredients and as raw materials for use in the dietary, food, and pharmaceutical industries. Further studies on bioavailability and antioxidant capacity are recommended to better define their nutritional and functional value. Full article

(This article belongs to the Special Issue Fruits and Vegetables: Physicochemical Properties, Product Development and Health Benefits)

21 pages, 13341 KB

Open AccessArticle

Metabolomics and Transcriptomics Analyses Explore the Genes Related to the Biosynthesis of Antioxidant Active Ingredient Isoquercetin

by Liyan Cui, Jiaoli Yang, Rui Yuan, Shuting Wang, Zhennan Ma, Defu Wang and Yanbing Niu

Foods 2026, 15(2), 218; https://doi.org/10.3390/foods15020218 - 8 Jan 2026

Abstract

Astragalus membranaceus is a model of traditional ‘homologous nature of medicine and food’. Its stems and leaves have been proven to have a variety of biological activities. In this study, high-throughput sequencing technology was used to sequence transcriptomics and metabolomics A. membranaceus stems [...] Read more.

Astragalus membranaceus is a model of traditional ‘homologous nature of medicine and food’. Its stems and leaves have been proven to have a variety of biological activities. In this study, high-throughput sequencing technology was used to sequence transcriptomics and metabolomics A. membranaceus stems and leaves at different growth stages (flowerless stage, flower bud stage, flowering stage, green fruit stage, mature fruit staged, and withering stage), and a regulation analysis was conducted on its differentially expressed genes and differentially accumulated metabolites. The results showed that five hub genes, PAL, CHI, AMIE, CAD, and PRX, were found to play a central regulatory role in flavonoid biosynthesis. The combined analysis of transcriptomics and metabolomics constructed a flavonoid metabolic regulatory network during the growth and development of A. membranaceus stems and leaves. At the same time, based on the significant antioxidant activity of isoquercitrin, three genes that may be related to isoquercitrin biosynthesis were screened, namely IF7MAT, FG3, and UGT78D2. The results of this study provide insights into the biosynthesis and comprehensive development and utilization of flavonoids in A. membranaceus. Full article

(This article belongs to the Section Plant Foods)

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18 pages, 273 KB

Open AccessArticle

A Conjoint Analysis of Consumer Preferences on Shiitake Mushrooms: A Case Study of the Republic of Korea

by Changjun Lee and Kidong Kim

Foods 2026, 15(2), 217; https://doi.org/10.3390/foods15020217 - 8 Jan 2026

Abstract

Shiitake mushrooms (Lentinula edodes) are widely consumed as a key health food in the Republic of Korea. However, they face declining production value and consumption, necessitating a shift from production-focused research to an understanding of consumer demand. The aim of this [...] Read more.

Shiitake mushrooms (Lentinula edodes) are widely consumed as a key health food in the Republic of Korea. However, they face declining production value and consumption, necessitating a shift from production-focused research to an understanding of consumer demand. The aim of this study was to quantify Korean consumers’ trade-offs among key shiitake attributes and to derive actionable marketing strategies to expand domestic consumption. We conducted an online survey (n = 500) to quantify consumer utility for four key attributes: cap size (two levels), cap color (two levels), origin (two levels: domestic (Korean) and imported (Chinese)), and price (four levels per 500 g). The results identified price as the most important attribute (relative importance = 46.41%), followed by origin (19.85%), cap color (17.10%), and cap size (16.64%). Utility analysis (part-worths) revealed a distinct dual preference: consumers value both low-priced shiitake (KRW 4000 (USD 2.9)/500 g) for personal consumption and high-priced options (KRW 13,000 (USD 9.5)/500 g) for gifting. Consumers showed a clear preference for dark-colored caps, while the aggregate-level utility difference between origin levels was small. A Logit model simulation indicated the highest predicted shares for profiles priced at KRW 13,000 (15.9%) and KRW 4000 (15.7%), consistent with a polarized value–premium structure. These findings indicate that Korean producers should adopt a dual strategy: developing low-cost products to stimulate general consumption while simultaneously marketing high-quality, dark-colored, domestically produced shiitake as premium gift items, thereby establishing effective food choice strategies in a competitive market. Although the empirical setting is the Republic of Korea (with ‘Chinese’ included only as an imported-origin level representing the main foreign competitor), the findings speak to broader specialty-food contexts where import competition and dual-purpose purchasing (everyday use vs. gifting) shape attribute trade-offs. Full article

(This article belongs to the Special Issue Consumer Behavior and Food Choice—4th Edition)

21 pages, 1209 KB

Open AccessReview

Intelligent Discrimination of Grain Aging Using Volatile Organic Compound Fingerprints and Machine Learning: A Comprehensive Review

by Liuping Zhang, Jingtao Zhou, Guoping Qian, Shuyi Liu, Mohammed Obadi, Tianyue Xu and Bin Xu

Foods 2026, 15(2), 216; https://doi.org/10.3390/foods15020216 - 8 Jan 2026

Abstract

Grain aging during storage leads to quality deterioration and significant economic losses. Traditional analytical approaches are often labor-intensive, slow, and inadequate for modern intelligent grain storage management. This review summarizes recent advances in the intelligent discrimination of grain aging using volatile organic compound [...] Read more.

Grain aging during storage leads to quality deterioration and significant economic losses. Traditional analytical approaches are often labor-intensive, slow, and inadequate for modern intelligent grain storage management. This review summarizes recent advances in the intelligent discrimination of grain aging using volatile organic compound (VOC) fingerprints combined with machine learning (ML) techniques. It first outlines the biochemical mechanisms underlying grain aging and identifies VOCs as early and sensitive biomarkers for timely determination. The review then examines VOC determination methodologies, with a focus on headspace solid-phase microextraction coupled with gas chromatography-mass spectrometry (HS-SPME-GC-MS), for constructing volatile fingerprinting profiles, and discusses related method standardization. A central theme is the application of ML algorithms, including Partial Least Squares Discriminant Analysis (PLS-DA), Support Vector Machines (SVM), Random Forest (RF), and Convolutional Neural Networks (CNN)) for feature extraction and pattern recognition in high-dimensional datasets, enabling effective discrimination of aging stages, spoilage types, and grain varieties. Despite these advances, key challenges remain, such as limited model generalizability, the lack of large-scale multi-source databases, and insufficient validation under real storage conditions. Finally, future directions are proposed that emphasize methodological standardization, algorithmic innovation, and system-level integration to support intelligent, non-destructive, real-time grain quality monitoring. This emerging framework provides a promising powerful pathway for enhancing global food security. Full article

(This article belongs to the Special Issue Anti-Food Fraud: Technologies in Food Safety, Quality and Traceability)

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16 pages, 968 KB

Open AccessArticle

Odor-Active Compound Stability in Mango Peel Side-Streams: Insights for Valorization and Waste Minimization

by Rodrigo Oliver-Simancas, María Consuelo Díaz-Maroto, Álvaro Fernández-Ochoa, María Soledad Pérez-Coello and María Elena Alañón

Foods 2026, 15(2), 215; https://doi.org/10.3390/foods15020215 - 8 Jan 2026

Abstract

Comprehensive characterization of the mango peel volatilome is essential to revealing its aromatic potential and enabling its revalorization as a natural flavoring. The volatile profile of Mangifera indica L. var. Osteen peels at three ripening stages (green, ripe, overripe) was analyzed before and [...] Read more.

Comprehensive characterization of the mango peel volatilome is essential to revealing its aromatic potential and enabling its revalorization as a natural flavoring. The volatile profile of Mangifera indica L. var. Osteen peels at three ripening stages (green, ripe, overripe) was analyzed before and after thermal drying (45 °C, 18 h): an unavoidable stabilization step for valorization applications. HS–SPME/GC–MS enabled the identification of 76 volatile compounds across different key aroma-contributing families: monoterpenes, sesquiterpenes, alcohols, aldehydes, ketones, esters, furanics and norisoprenoids. The ripening stage significantly influenced the qualitative and quantitative volatilome in fresh samples but drying heavily reduced those differences. Multivariate analyses confirmed that the drying process is the dominant factor shaping the stabilized peels’ volatilome. These findings underscore the industrial relevance of this side-stream: regardless of ripening stage, mango peels can be uniformly stabilized to be upcycled into aroma-rich ingredients. It simplifies raw material sourcing and supports food waste revalorization strategies in flavor and fragrance developments. Full article

(This article belongs to the Special Issue Food Products and By-Products: Deep Processing and Comprehensive Utilization)

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13 pages, 510 KB

Open AccessArticle

Effects of Low-Frequency Solid-State Microwave Cooking on the Quality Properties of Beef Meat

by Gönül Çavuşoğlu Kaplan and Ebru Fıratlıgil

Foods 2026, 15(2), 214; https://doi.org/10.3390/foods15020214 - 8 Jan 2026

Abstract

Solid-state microwave technology has emerged as an alternative to conventional magnetron-based microwave systems due to its precise frequency control and potential to improve heating uniformity. The objective of this study was to evaluate the effects of solid-state microwave cooking at 912–913 MHz on [...] Read more.

Solid-state microwave technology has emerged as an alternative to conventional magnetron-based microwave systems due to its precise frequency control and potential to improve heating uniformity. The objective of this study was to evaluate the effects of solid-state microwave cooking at 912–913 MHz on the quality characteristics of beef steak and minced beef in comparison with conventional oven cooking and traditional microwave cooking (2450 MHz). Meat samples were cooked to an internal temperature of 75 °C, and cooking time, weight loss, moisture content, lipid oxidation (TBARS), total soluble protein (TSP), color attributes, and texture properties were evaluated. Solid-state microwave cooking resulted in shorter cooking times compared to conventional oven cooking. However, it caused significantly higher cooking loss in beef steak (48.1%) compared to conventional (34.8%) and microwave cooking (42.4%) (p ≤ 0.05). In minced beef, solid-state microwave cooking led to significantly higher TBARS values (1.56 mg MDA/kg) than conventional cooking (1.07 mg MDA/kg) (p ≤ 0.05), indicating increased lipid oxidation. No significant differences were observed among cooking methods for total soluble protein content and several texture parameters (p > 0.05). Solid-state microwave cooking produced improved color development compared to traditional microwave cooking. Overall, solid-state microwave cooking shows potential advantages in processing time and color formation; however, increased cooking loss and lipid oxidation indicate that optimization of processing conditions is necessary to limit undesirable quality changes. Full article

(This article belongs to the Special Issue Advanced Food Processing Technologies and Approaches: 2nd Edition)

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19 pages, 1300 KB

Open AccessArticle

Supercritical Fluid CO₂ Extraction of Essential Oil from Spearmint Leaves Dried by Vacuum Drying with a Desiccant

by Rustam Tokpayev, Zair Ibraimov, Khavaza Tamina, Bauyrzhan Bukenov, Bagashar Zhaksybay, Amina Abdullanova, Yekaterina Chshendrygina, Kanagat Kishibayev and Luca Fiori

Foods 2026, 15(2), 213; https://doi.org/10.3390/foods15020213 - 7 Jan 2026

Abstract

The essential oil (EO) of Mentha spicata L. (spearmint) exhibits pronounced biological activity, making it valuable for applications in agrochemistry as an insecticidal agent, in perfumery and cosmetics, and as a natural preservative in the food industry. However, maintaining the integrity and yield [...] Read more.

The essential oil (EO) of Mentha spicata L. (spearmint) exhibits pronounced biological activity, making it valuable for applications in agrochemistry as an insecticidal agent, in perfumery and cosmetics, and as a natural preservative in the food industry. However, maintaining the integrity and yield of EO during post-harvest processing and extraction remains a key technological challenge. This study aimed to enhance the vacuum-drying (VD) process of spearmint using calcium chloride as a desiccant and to optimize the conditions of supercritical CO₂ extraction (SC-CO₂), including EO separation and the evaluation of its solubility under dynamic extraction conditions. The incorporation of calcium chloride into the VD process reduced drying duration by 21.1% and processing costs by 31.0%, while increasing EO yield by 11%. A decrease in separator pressure from 70 to 10 bar during SC-CO₂ extraction resulted in nearly a threefold increase in EO yield by minimizing the loss of volatile constituents. The solubility of spearmint EO in supercritical CO₂ was successfully described by the Chrastil model and correlated with carvone solubility. The maximum total phenolic content (72.3 ± 2.2 mg gallic acid equivalent per gram) was observed at a CO₂ density of 353.91 kg/m³. The solubility of EO was studied directly using the plant matrix under dynamic conditions. Full article

(This article belongs to the Special Issue Plant Essential Oils: Extraction, Characterization, Biological Activities, and Their Applications in Foods)

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