Search Results (518)

This study explored the enhancement of exopolysaccharide (EPS) production by Ganoderma lucidum through bidirectional liquid fermentation, employing Clinacanthus nutans (Burm. f.) Lindau leaves as a medicinal substrate. The optimal concentration of C. nutans leaf powder was determined to be 6 g/L, resulting in a significant increase in both mycelial biomass (61.78%) and EPS yield (116.6%). Structural analyses indicated that the EPS supplemented with C. nutans underwent notable modifications. Fourier-transform infrared spectroscopy suggested the introduction of potential carbonyl groups and a shift in glycosidic linkage configuration. Monosaccharide composition analysis revealed a significant transition from a glucose-dominated profile in the control to a galactose-rich, more diverse profile, including uronic acids and amino sugars, in the experimental group. High-performance gel permeation chromatography demonstrated a transformation from a low, homogeneous molecular weight (4.7 kDa) to a heterogeneous, bimodal distribution featuring a prominent high-molecular-weight fraction (38.5 kDa). Consequently, the modified EPS exhibited significantly enhanced antioxidant activities, with scavenging rates for DPPH, hydroxyl, and ABTS radicals increasing to 55.5%, 35.1%, and 88.0%, respectively, at a concentration of 2 mg/mL. These findings demonstrate that C. nutans is an effective supplement for modulating the fermentation process of G. lucidum, not only boosting EPS production but also tailoring its structural characteristics to obtain polysaccharides with superior bioactivities, highlighting its potential in functional food and nutraceutical applications. Full article

Yam polysaccharides are promising functional food ingredients, but the systematic understanding of how cultivar and processing synergistically determine their structure and functionality is still lacking. This study systematically investigated how hot water extraction, enzymatic hydrolysis, and extrusion puffing affect the structural and functional properties of polysaccharides from two major cultivars (Dioscorea opposite cv. Tiegun and Dioscorea esculenta cv. Gaozhou). Enzymatic extraction increased yield (1.39–1.77-fold) and solubility, while hot water extraction favored purity. The monosaccharide composition was strongly cultivar-dependent, with Tiegun polysaccharides containing higher mannose levels. Extrusion puffing of Gaozhou polysaccharide improved solubility by 33.3% but induced depolymerization and aggregation, modifying colloidal and functional behaviors. Multivariate analysis revealed that processing methods primarily governed macromolecular architecture and colloidal properties, whereas cultivar determined chemical composition. These findings establish a processing–structure–property framework, enabling the tailored production of yam polysaccharides: Tiegun yam with enzymatic extraction for high bioactivity, and Gaozhou yam with extrusion puffing for superior solubility. Full article

Flesh mealiness, a textural disorder in apples, reduces storage quality and consumer acceptance. The ‘Delicious’ and ‘Fuji’, prominent apple cultivars in China, exhibit contrasting susceptibility to mealiness, though the underlying mechanisms remain unclear. This study compared cytological, physiological and cell wall metabolic changes between mealy ‘Oregon Spur II Delicious’ and non-mealy ‘Miyazaki Spur Fuji’ during ambient storage. Toluidine blue staining and scanning electron microscopy revealed that ‘Delicious’ exhibited larger intercellular spaces and cell separation in contrast to ‘Fuji’. This observation aligns with the earlier onset of mealiness in ‘Delicious’: its mealiness degree increased from 3.06% at harvest to 19.62% after 28 d of storage (a 6.4-fold rise), whereas that of ‘Fuji’ only increased from 2.13% to 3.90% (1.8-fold). This pronounced increase in ‘Delicious’ was accompanied by a significant increase in air space volume and a reduction in expressible juice. Furthermore, the occurrence of mealiness in ‘Delicious’ involved a sharp increase in respiration rate and ethylene production, alongside rapid declines in firmness and starch content. Notably, there was a substantial accumulation of water-soluble pectin (WSP) and chelator-soluble pectin (CSP) in ‘Delicious’, whereas the content of Na₂CO₃-soluble pectin (NSP) remained consistently lower. Monosaccharide composition analysis confirmed significantly reduced arabinose and galactose levels across pectin fractions (WSP, CSP, and NSP) in ‘Delicious’. Correspondingly, immunofluorescence labeling showed a pronounced degradation of arabinan and galactan within the side chains of rhamnogalacturonan-I (RG-I). In addition, the activities of pectin methylesterase, α-L-Arabinofuranosidase, and β-D-Galactosidase remained significantly elevated in ‘Delicious’. Collectively, these findings demonstrate that cultivar differences in flesh mealiness are attributable to divergent physiological senescence and cell wall disassembly processes. Full article

Immunodeficiency is a global health concern, partly due to disrupted rhythms and drugs. Marine glycopeptides, with immunomodulatory and intestinal barrier protective activities, show great potential in dietary supplements and functional foods. Here, a marine glycopeptide, SC2-3, with a molecular weight of 5061 Da, was isolated and purified from Nereis succinea. Monosaccharide composition, NMR data, amino acid composition analysis, and SDS-PAGE analyses identified SC2-3 as a glycopeptide. The N-glycome results of SC2-3 collected by MALDI-TOF-MS revealed that SC2-3 contains fucosylated N-glycans with shorter glycan chains compared to human-derived N-glycans. SC2-3 exerted a significant immune-enhancing effect on macrophages in vitro. In vivo, in cyclophosphamide-induced immunocompromised mice, SC2-3 at different concentrations elevated organ indices, blood cell counts, and serum levels of IL-1β, TNF-α, and IL-6, while repairing cyclophosphamide-damaged/atrophied tissues. Mechanistically, SC2-3 induced the differentiation of RAW264.7 cells toward an M1-like activation profile, significantly promoting the release of NO and ROS, upregulating the secretion of pro-inflammatory cytokines (IL-1β, TNF-α, and IL-6), and activating the TLR4/NF-κB signaling pathway. Additionally, SC2-3 upregulated intestinal epithelial tight junction proteins and normalized the overexpression of MUC-2, thereby maintaining intestinal barrier integrity. These findings indicated the potential efficacy of the glycopeptide SC2-3 derived from natural marine sources in immunomodulation and protection of intestinal health. Full article

Background: Traditionally, wild jujube (Ziziphus jujuba Mill. var. spinosa (Bunge) Hu ex H. F. Chou) has been used to nourish the heart, calm the spirit, and arrest spontaneous sweating. Modern research confirms its broad pharmacological activities, including antioxidant, anti-inflammatory, neuroprotective, and cognitive-enhancing effects. This study aims to isolate and characterize the structure of jujube polysaccharides and evaluate their protective effects against oxidative stress damage in neural stem cells (NSCs). Methods: We successfully isolated and purified a novel pectin polysaccharide (ZJP-2) from wild jujube. Its structure was characterized in detail using high-performance liquid chromatography coupled with multi-angle laser light scattering and refractive index detection (HPLC-MALS-RI), high-performance anion exchange chromatography (HPAEC), gas chromatography–mass spectrometry (GC-MS), and nuclear magnetic resonance (NMR) spectroscopy. Results: Structural analysis revealed that ZJP-2 is a pectin heteropolysaccharide with a molecular weight of approximately 67.93 kDa. Its monosaccharide composition primarily includes galac-turonic acid (GalA), arabinose (Ara), rhamnose (Rha), galactose (Gal), and glucose (Glc). The backbone consists of α-GalA and rhamnose-galacturonic acid-I (RG-I) domains linked by (1→4)-glycosidic bonds. NMR spectroscopy further confirmed its glycosidic bond types. In activity assessment, our study demonstrated that ZJP-2 significantly alleviated DMNQ-induced oxidative stress damage in C17.2 neural stem cells. Its protective effect was achieved by reducing intracellular reactive oxygen species (ROS) levels and upregulating the mRNA expression of antioxidant genes associated with the signaling axis (p < 0.05). Moreover, ZJP-2 suppressed DMNQ-induced overexpression of Nestin and NeuN (p < 0.05), contributing to the maintenance of NSCs’ undifferentiated state and functional homeostasis. Conclusions: In conclusion, ZJP-2 possesses distinct structural characteristics and significant neuroprotective potential, supporting its development as a natural functional food or dietary supplement for preventing oxidative stress-related neural damage. Full article

Chicory (Cichorium intybus L.) is a widely used nutritional and medicinal plant, whose roots are an important commercial source of inulin, while the aerial parts are often discarded during industrial processing. This study systematically compared chicory polysaccharides (CPs) extracted from aerial parts (CP-A) and roots (CP-R) with respect to their compositional features and cytoprotective effects in an oxygen–glucose deprivation/reperfusion (OGD/R)-induced H9c2 cell injury model. CP-A and CP-R differed in molecular weight distribution and monosaccharide composition, with CP-R exhibiting a higher molecular weight and fructose content. Despite these differences, both fractions significantly improved cell viability and reduced oxidative and biochemical injury markers. Integrated proteomic and transcriptomic analyses indicated that CP-A and CP-R were associated with the modulation of stress-responsive signaling networks, prominently involving oxidative stress-linked MAPK/NF-κB pathways. These findings demonstrate comparable cytoprotective activities of polysaccharide-rich fractions from roots and aerial parts and support the valorization of chicory aerial biomass as a potential source of functional ingredients for cardiovascular health. Full article

Bamboo shoot polysaccharides possess promising bioactivities, but their high molecular weight and complex branched structures limit their functional efficacy. In this study, bamboo (Phyllostachys edulis) shoots were fermented with Monascus purpureus ATCC16426 to obtain a novel neutral polysaccharide (FBSP-1). Monosaccharide composition analysis indicated that FBSP-1 comprised glucose (Glc), xylose (Xyl), arabinose (Ara), galactose (Gal), and mannose (Man). Glycosidic linkage and nuclear magnetic resonance (NMR) spectroscopy data revealed that the backbone of FBSP-1 mainly consisted of →2)-α-Manp-(1→, →4)-α-Glcp-(1→, →3)-β-Xylp-(1→, →3)-α-Araf-(1→ and →2)-α-Araf-(1→. Compared with unfermented polysaccharide BSP-1, fermentation markedly altered the monosaccharide profile, increasing Glc, Xyl and Man, decreasing Ara and Gal, and reducing the molecular weight. In H₂O₂-treated Caco-2 cells, FBSP-1 significantly alleviated oxidative damage by reducing intracellular reactive oxygen species (ROS) and malondialdehyde (MDA) levels, while enhancing the activities of superoxide dismutase (SOD) and glutathione reductase (GR), demonstrating pronounced antioxidant protective effects. Overall, this study demonstrates that Monascus fermentation is an effective strategy for the structural remodeling of bamboo shoot polysaccharides, enabling the enhancement of their antioxidant functionality and supporting their potential application as functional ingredients in plant-based antioxidant foods. Full article

Finger Citron (Citrus medica L. var. sarcodactylis Swingle) holds significant potential as both a culinary ingredient and a traditional medicinal remedy; however, its precise molecular mechanisms of action remain largely unexplored. This study investigates the anti-inflammatory properties of Finger Citron extract (FCE) in RAW 264.7 macrophages stimulated by lipopolysaccharide (LPS). Using UPLC-ESI-QTF-MS, we analyzed the extract’s composition, revealing a rich presence of polyphenols and polysaccharides, with hesperidin, melitidin, and hesperetin as the predominant polyphenolic compounds. Additionally, the study elucidated the monosaccharide composition profile of polysaccharides in the extract. Furthermore, Finger Citron extract markedly suppressed the production of key inflammatory mediators, including TNF-α, IL-6, and NO. The inhibition of protein phosphorylation levels of inhibiting the mitogen-activated protein kinase (MAPK) and nuclear factor kappa-B (NF-κB) signaling was also observed, indicating that the anti-inflammatory effects of Finger Citron extract may involve the NF-κB and MAPK signaling pathway. Given these findings, Finger Citron extract has the potential to act as a natural product with anti-inflammatory activity. Full article

In this study, ultrasound-assisted extraction (UAE) of Adenophora triphylla root polysaccharides (ATRPs) was optimized using response surface methodology (RSM), and the physicochemical and functional properties of the resulting polysaccharides were investigated. A Box–Behnken Design (BBD) was applied to optimize the UAE conditions for ATRPs. The optimal UAE conditions for ATRPs with the maximum extraction yield were an extraction temperature of 34 °C, an extraction time of 41 min, and a solvent-to-solid ratio of 34 (mL/g). Under these conditions, the maximum extraction yield of UAE-ATRPs (12.46%) was significantly higher than that obtained by water extraction without sonication (WE-ATRPs, 9.76%). The results of monosaccharide composition showed that WE-ATRPs and UAE-ATRPs were heteropolysaccharides, mainly composed of glucose. In addition, FT-IR and ¹H-NMR analyses indicated that both ATRPs had α-pyranose-type glycosidic structures. The optimal UAE process reduced the glucose content from 57.70% to 53.87% relative to WE-ATRPs. Moreover, UAE-ATRPs exhibited lower solution viscosity and improved the emulsifying properties relative to WE-ATRPs. Both ATRPs also exhibited anti-inflammatory activity by inhibiting nitric oxide synthesis. In summary, our findings suggest that UAE is an effective approach for improving the extraction yield and functional properties of ATRPs, highlighting their potential applications in the food industry. Full article

Background/Objectives: Aging is accompanied by profound alterations in gut microbiota composition, reduced microbial diversity, and impaired metabolic resilience. Dietary polysaccharides with different structures exhibit varying efficacy in alleviating these age-related disorders. In this study, we aimed to extract and characterize polysaccharides from white kidney bean (Phaseolus vulgaris L.) cotyledon using different methods and to evaluate their fermentation behavior by the elderly gut microbiota. Methods: White kidney bean cotyledon polysaccharides were extracted using ultrasound-assisted acid (WKBC-P1), alkaline (WKBC-P2), and chelator (WKBC-P3) methods. Ex vivo fermentation of WKBC-P1, WKBC-P2, and WKBC-P3 was performed using pooled fecal microbiota from the elderly aged 65–70 years old. Results: Monosaccharides profiling revealed that WKBC-P1 and WKBC-P3 were rich in arabinose, whereas WKBC-P2 contained high levels of glucose. Molecular weight analysis indicated that acidic extraction led to smaller, more fragmented polysaccharides, while chelating extraction produced the highest molecular weight and most uniform fractions. Ex vivo fecal fermentation showed that WKBC-P1 and WKBC-P2 significantly increased the relative abundance of Bifidobacterium and Bacteroides_H while suppressing potentially harmful Proteobacteria. Correspondingly, both fractions induced robust production of short-chain fatty acids (SCFAs), while reducing branched short-chain fatty acids (bSCFAs), indicating a metabolic shift toward carbohydrate fermentation rather than protein catabolism. Conclusions: Overall, these findings demonstrate that acidic and alkaline extractions yield fractions that most effectively support beneficial microbial growth and SCFAs generation in aging microbiota. This knowledge might indicate that white kidney bean cotyledon polysaccharides represent promising prebiotic candidates for maintaining gut homeostasis and metabolic health in elderly populations. Full article

The present study investigated the cultivation of Pleurotus columbinus on alternative substrates derived from spent mushroom substrate combined with spent coffee grounds or wheat straw, with or without supplementation with wheat bran and soybean flour, in comparison to conventional wheat straw. All substrates were evaluated for their effects on the nutritional composition, amino acid profile, lipid, carbohydrate contents and bioactive compounds of the harvested carposomes. Protein content ranged from 15.6 to 21.4% w/w. Methionine was identified as the first limiting amino acid and the essential amino acid index was up to 60.9%. Carbohydrate content exceeded 63.3% w/w in all samples, with glucose identified as the major monosaccharide. Lipid content was low (1.7–3.4% w/w), with polyunsaturated fatty acids predominating. Ash content ranged from 5.7 to 6.3% w/w and the energy value varied between 36.2 and 37.1 kcal/100 g f.w. Bioactive compounds, including β-glucans (35.9–44.4% w/w) and ergosterol (3.3–4.7 mg/g d.w.), along with their metabolites, were successfully quantified. Non-supplemented substrates enhanced β-glucan levels; most of them were further isolated, whereas lovastatin was not detected in any sample. Overall, P. columbinus cultivated on alternative substrates exhibited improved nutritional quality and higher bioactive compound content compared to conventional cultivation, demonstrating the potential of agro-industrial by-products as sustainable substrates for high-value mushroom production. Full article

Non-starch polysaccharides, the primary structural component of dietary fiber, play critical roles in metabolic and digestive health through multiple physiological mechanisms, yet their composition in Mediterranean aromatic plants remains poorly characterized, limiting the development of novel functional food ingredients. This study provides the first comprehensive NSP profiling of 22 populations across three Tunisian Satureja species (S. nervosa, S. graeca, and endemic S. barceloi), using enzymatic analysis, gas chromatography, and multivariate statistics. Total non-starch polysaccharides reached exceptional levels (21.5 ± 3.0 g/100 g dry weight (DW)), with several populations exhibiting unprecedented soluble fiber proportions exceeding 50%, including population SG4 achieving 79.7%. Monosaccharide analysis revealed uronic acid dominance (42.9–52.5% of total NSP), indicating pectin-rich cell walls with distinct functional properties. Principal component analysis (explaining 61.5–84.9% of variance) demonstrated that populations cluster by fiber chemotype rather than taxonomic classification. Hierarchical and K-means clustering identified three distinct clusters in the soluble and total fiber fractions, with uronic acid-dominated populations (SG4, SB, SG18, SN8) and arabinose–xylose enriched populations (SN13, SN12, SN22, SG21) as extreme chemotypes. Intraspecific variation (coefficient of variation, CV: 14.0–50.0%) substantially exceeded interspecific differences. These findings establish Tunisian Satureja as an exceptional functional fiber source and demonstrate that population-level chemical screening outperforms taxonomic classification for developing nutraceuticals targeting cholesterol reduction, glycemic control, and gut microbiome modulation. Full article

To investigate the effect of a polysaccharide-based composite film (ASC) composed of Alpinia oxyphylla polysaccharide (its molecular weight was approximately 4.07 kDa, and the monosaccharide composition was predominantly glucose and galacturonic acid), sodium alginate, and calcium chloride on the storage quality of shrimp surimi, this study compared the preservation efficacy of the ASC film with that of treatments using chitosan, potassium sorbate, ascorbic acid, sodium alginate, Alpinia oxyphylla polysaccharide, and distilled water. Samples were stored at 4 °C for 12 days, and evaluations were conducted by measuring film structural characteristics and quality indicators of shrimp surimi. Results showed that the ASC groups (where Alpinia oxyphylla polysaccharide was added at 20%, 30%, and 40% of the sodium alginate mass, designated as ASC 20%, ASC 30%, and ASC 40%) significantly outperformed the control group across all quality indicators. The ASC 30% group demonstrated the best overall preservation performance, effectively delaying oxidative browning, protein degradation, lipid oxidation, and microbial growth in shrimp surimi. The ASC 40% group exhibited particularly strong antibacterial effects, while the ASC 20% group also showed stable preservation performance. The composite film combines the antioxidant and antibacterial activities of Alpinia oxyphylla polysaccharide with the barrier and moisture-retention properties of sodium alginate, forming a stable three-dimensional network structure through calcium chloride cross-linking. It is superior to single/individual chemical preservatives in terms of film-forming ability, functionality, and safety, providing a natural, effective, and environmentally friendly preservation approach for shrimp surimi and other aquatic products. It also offers a theoretical foundation and practical reference for the development of natural preservation technologies in the food industry. Full article

Mucilage extracted from cladodes of Opuntia ficus-indica (L.) Mill. has attracted growing interest as a natural food additive due to its gelling and nutritional properties. In this study, the chemical characteristics of Opuntia ficus-indica mucilage were comparatively evaluated against commercial pectin, with particular emphasis on volatile compounds, mineral composition, and monosaccharide profiles by ¹³C-NMR spectroscopic analysis. The volatile components were analysed using gas chromatography–mass spectrometry (GC-MS), revealing distinct aromatic profiles between the two matrices, with the mucilage showing a significant presence of methoxypyrazines, but not detected in the powdered pectin studied. These compounds could negatively affect the sensory perception of mucilage. Mineral analysis demonstrated significantly higher levels of calcium, magnesium, and potassium, supporting its potential contribution to nutritional enrichment. The spectroscopic analysis, used to identify monosaccharide composition of polysaccharide chains, highlighted the presence of arabinose, galactose, glucose, and rhamnose in the mucilage sample compared to the predominantly glucose/galacturonic acid-based structure of pectin. Overall, the results indicate that Opuntia ficus-indica mucilage represents a promising alternative to pectin, offering unique chemical properties that may expand its application as a multifunctional, natural food additive. Full article

Traditional polysaccharide extraction suffers from low efficiency and high energy consumption, while deep eutectic solvents (DESs) are promising sustainable solvents. This study used DES ChCl-LA (1:2) with ultrasonic assistance to extract polysaccharides from red alga A.taxiformis. Optimized via single-factor experiments and response surface methodology (350 W, 1:30 g/mL, 75 °C), the yield reached 11.28% ± 0.50% (1.5 times higher than that obtained by water extraction). Structural characterization revealed that the DES extract was an acidic polysaccharide, mainly composed of galactose (89.2%), glucose (4.9%), xylose (4.9%), and glucuronic acid (1.0%), with a weight-average molecular weight of 99.88 kDa. Density functional theory and molecular dynamics simulations showed that ChCl-LA enhanced galactose solubility via stronger hydrogen bonding (−25.33 vs. −5.06 kcal/mol for water). Notably, the immunological activity of the DES-extracted polysaccharide was significantly compromised compared to the water-extracted counterpart (p < 0.05). At a concentration of 0.25 mg/mL, the water-extracted polysaccharide-treated group exhibited a 33.98% higher neutral red phagocytosis rate in macrophages, a nitric oxide (NO) secretion level of 34.14 μmol/L (94.98% higher) compared with the DES-extracted polysaccharide group, as well as significantly higher secretion levels of tumor necrosis factor-α (TNF-α) and interleukin-6 (IL-6). The observed disparity in bioactivity is likely due to the distinct chemical profiles resulting from the two extraction methods, including the significantly reduced molecular weight and potential alterations of sulfation degree, monosaccharide composition, and protein content in the DES-extracted polysaccharide. This mechanistic perspective is supported by the relevant literature on the structure–activity relationships of polysaccharides. This study demonstrates the potential of ChCl-LA and elucidates the complex effects of extraction methods on polysaccharide’s structure and function, thereby informing the high-value utilization of A. taxiformis in functional foods. Full article