Phenolics as Antioxidant Agents II

A special issue of Antioxidants (ISSN 2076-3921). This special issue belongs to the section "Natural and Synthetic Antioxidants".

Deadline for manuscript submissions: closed (30 June 2023) | Viewed by 6331

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Guest Editor
Centre for the Research and Technology of Agro-Environmental and Biological Sciences – CITAB, Universidade de Trás-os-Montes e Alto Douro, UTAD, Vila Real, Portugal
Interests: crop production; cultural practices and influence in plant composition; plant composition and metabolomic analysis; plant composition and health effects; an agroecosystems
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Special Issue Information

Dear Colleagues,

The interest in plants as a source of bioactive compounds continues to receive increasing attention in the research community due to the recognized potential that these compounds have. Advances in extraction, identification, and quantification have allowed the development of innovative studies into their role as antioxidant, anti-inflammatory, anti-degenerative, and antitumor agents. However, there are many questions still being raised about their efficacy, particularly when in vivo models are used.

Contributions to this Special Edition can cover all aspects related to the extraction, identification, characterization, and quantification of bioactive compounds present in plants and its extracts; demonstration of the mechanisms of antioxidant action; recent advances in analytical methods; new plants with high levels of bioactive compounds; valorization of crops and plants as source of antioxidants compounds; influence of pre- and post-harvest factors on the antioxidant profile in plants; and in vitro and in vivo assays, including clinical and pharmaceutical trials on the effect of these compounds on human and animal health.

Dr. Alfredo Aires
Guest Editor

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Keywords

  • antioxidants
  • crops
  • plant extracts
  • byproducts
  • antioxidant capacity
  • radical scavenging

Published Papers (3 papers)

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Research

18 pages, 3194 KiB  
Article
Effect of Brewing Conditions on Antioxidant Properties of Ginkgo biloba Leaves Infusion
by Patrycja Biernacka, Katarzyna Felisiak, Iwona Adamska, Marek Śnieg and Cezary Podsiadło
Antioxidants 2023, 12(7), 1455; https://doi.org/10.3390/antiox12071455 - 19 Jul 2023
Cited by 1 | Viewed by 1591
Abstract
Due to the growing awareness of the importance of healthy eating in society, there is an increasing interest in the use of herbs and low-processed, natural products. Ginkgo biloba is a raw material with a high pro-health potential, which is related to the [...] Read more.
Due to the growing awareness of the importance of healthy eating in society, there is an increasing interest in the use of herbs and low-processed, natural products. Ginkgo biloba is a raw material with a high pro-health potential, which is related to the high content of antioxidant compounds. The aim of the study was to determine the relationship between the antioxidant activity of Ginkgo biloba leaf infusions and the weighted amount of leaves and brewing time. In addition, a sensory analysis of the infusions obtained was carried out. The innovation is to determine the migration of micro- and macroelements to the infusion prepared from Ginkgo biloba depending on the leaves’ weight used and the brewing time. The research showed the dependence of the antioxidant activity of the infusions and the migration of microelements on the size of the dried material and the brewing time. In the publication, the main factors influencing the quality of infusions were analysed, their mutual correlations were determined, and combinations showing the highest antioxidant activity and, at the same time, the highest sensory acceptability were selected. Full article
(This article belongs to the Special Issue Phenolics as Antioxidant Agents II)
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16 pages, 1228 KiB  
Article
The Functional Profile and Antioxidant Capacity of Tomato Fruits Are Modulated by the Interaction between Microbial Biostimulants, Soil Properties, and Soil Nitrogen Status
by Paola Ganugi, Andrea Fiorini, Vincenzo Tabaglio, Federico Capra, Gokhan Zengin, Paolo Bonini, Tito Caffi, Edoardo Puglisi, Marco Trevisan and Luigi Lucini
Antioxidants 2023, 12(2), 520; https://doi.org/10.3390/antiox12020520 - 19 Feb 2023
Cited by 6 | Viewed by 1923
Abstract
The application of microbial biostimulants to plants has revealed positive effects related to nutrients uptake, stress tolerance, root development and phenological growth. However, little information is available exploiting the potential synergistic biostimulant action of microbes on the functional quality of the yields. The [...] Read more.
The application of microbial biostimulants to plants has revealed positive effects related to nutrients uptake, stress tolerance, root development and phenological growth. However, little information is available exploiting the potential synergistic biostimulant action of microbes on the functional quality of the yields. The current research elucidated the effect of single or coupled action of biostimulants, associated with either optimal or reduced nitrogen application, on the functional quality of tomato fruits. Chemical assays and untargeted metabolomics were applied to investigate Rhizoglomus irregulare and Funneliformis mosseae administration (both being arbuscular mycorrhiza, AMF), under optimal or low N input conditions, alone or coupled to Trichoderma atroviride application. The coupling of AMF and Trichoderma fungal inoculations resulted in a synergistic biostimulant effect on tomato fruits under sub-optimal fertility, revealing improved concentrations of carotenoid compounds—B-carotene (0.647 ± 0.243 mg/100 g), Z-carotene (0.021 ± 0.021 mg/100 g), 13-z-lycopene (0.145 ± 0.052 mg/100 g) and all-trans-lycopene (12.586 ± 1.511 mg/100 g), and increased values for total phenolic content (12.9 ± 2.9 mgGAE/g), total antioxidant activity (phosphomolybdenum, 0.9 ± 0.2 mmolTE/g), radical scavenging activity (DPPH, 3.4 ± 3.7 mgTE/g), reducing power (FRAP, 23.6 ± 6.3 mgTE/g and CUPRAC, 37.4 ± 7.6 mg TE/g), and enzyme inhibitory activity (AChE, 2.4 ± 0.1 mg GALAE/g), when compared to control. However, evidence of carotenoid and bioactive compounds were exclusively observed under the sub-optimal fertility and no significant differences could be observed between the biostimulant treatment and control under optimal fertility. Full article
(This article belongs to the Special Issue Phenolics as Antioxidant Agents II)
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15 pages, 301 KiB  
Article
Phytochemical Profile and Biological Activities of Different Extracts of Three Parts of Paliurus spina-christi: A Linkage between Structure and Ability
by Gokhan Zengin, Álvaro Fernández-Ochoa, María de la Luz Cádiz-Gurrea, Francisco Javier Leyva-Jiménez, Antonio Segura-Carretero, Fevzi Elbasan, Evren Yildiztugay, Sumira Malik, Asaad Khalid, Ashraf N. Abdalla and Mohamad Fawzi Mahomoodally
Antioxidants 2023, 12(2), 255; https://doi.org/10.3390/antiox12020255 - 23 Jan 2023
Cited by 5 | Viewed by 2300
Abstract
Paliurus spina-christi Mill., a member of the Rhamnaceae family, is a traditionally used medicinal plant in the management of a panoply of human ailments. The current research focused on its phytochemical profile and biological properties evaluated by its antioxidant and enzyme inhibitory properties. [...] Read more.
Paliurus spina-christi Mill., a member of the Rhamnaceae family, is a traditionally used medicinal plant in the management of a panoply of human ailments. The current research focused on its phytochemical profile and biological properties evaluated by its antioxidant and enzyme inhibitory properties. The methanol extract was found to be the most effective antioxidant as evidenced by its DPPH and ABTS scavenging activities, cupric and ferric reducing power (CUPRAC and FRAP), and high activity in phosphomolybdenum (PBD) assay, and also displayed the highest anti-tyrosinase activity. The n-hexane extract was the most effective AChE inhibitor (8.89 ± 0.08 mg GALAE/g) followed by the methanol (8.64 ± 0.01 mg GALAE/g) while the latter showed the highest BChE inhibition (2.50 ± 0.05 mg GALAE/g). Among the different solvent extracts of the stem, the methanolic extract showed highest antioxidant activity in the following assays: DPPH (909.88 ± 4.25 mg TE/g), ABTS (3358.33 ± 51.14 mg TE/g), CUPRAC (781.88 ± 16.37 mg TE/g), FRAP (996.70 ± 47.28 mg TE/g), and PBD (4.96 ± 0.26 mmol TE/g), while the dichloromethane extract showed the highest MCA (28.80 ± 0.32 mg EDTAE/g). The methanol extracts revealed the highest TPC and TFC among the different solvents used, and as for plant part, the stem extracts had the highest TPC ranging from 22.36 ± 0.26 to 121.78 ± 1.41 (mg GAE/g), while the leaf extracts showed the highest TFC ranging from 8.43 ± 0.03 to 75.36 ± 0.92 (mg RE/g). Our findings tend to provide additional scientific evidence on the biological and chemical activities of P. spina-christi, which may serve as a source of naturally occurring bioactive chemicals with potential biomedical applications. Full article
(This article belongs to the Special Issue Phenolics as Antioxidant Agents II)
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