Open research questions in Phytochemicals and Antioxidant Activities
986 gap statements mined from Phytochemicals and Antioxidant Activities papers in our 7.9M-paper local library, which holds 3,419 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.
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What the literature leaves open
The biological activity of polymeric proanthocyanidins is limited by their high molecular weight and degree of polymerization. There is a need to identify therapeutic agents that can alleviate scopolamine-induced learning and memory deficits.
Depolymerized red pine (Pinus densiflora Sieb. et Zucc.) bark extract attenuates scopolamine-induced learning and memory deficits in Sprague–Dawley rats · 2026 · DOILimited understanding of the metabolic profiles and anti-inflammatory activities of strawberry cultivars. Need for a comprehensive comparison of the health benefits of different strawberry cultivars.
Comparative anthocyanin profiles and anti-inflammatory activities in strawberry cultivars (Fragaria x ananassa Duch) · 2026 · DOIThe study also mentions the need to prioritize the upstream signaling pathways most relevant to the bioactive compounds.
Anti-adipogenic and antioxidant potential of Oenothera biennis sprout: inhibition of lipid accumulation and identification of key bioactive compounds · 2026 · DOILimited understanding of the non-volatile chemical profiles of Houttuynia cordata rhizomes and leaves. Lack of characterization of the in vitro antioxidant capacities of the two plant parts.
Integrated Untargeted Metabolomics and Antioxidant Profiling Reveal Tissue-Specific Chemical Differentiation Between Rhizomes and Leaves of Houttuynia cordata · 2026 · DOILimited human and animal interventions using Brassicaceae microgreens. The need for further investigation into the interplay between microgreen-derived carotenoids and other phytochemicals.
The lack of understanding of the interplay between phytochemical composition and antioxidant functionality. The need for a more comprehensive approach that combines phytochemical characterization with complementary antioxidant assays and biological models. The importance of considering antioxidant activity as a dynamic phenomenon rather than an exclusively endpoint-based phenomenon.
Special Issue on “Phytochemical Analysis and Evaluation of Antioxidant Properties in Medicinal Plants” · 2026 · DOIThe paper highlights the need for further research on the chemotaxonomy of these plant species. The study notes that the development of chemotaxonomy began a long time ago, but modern methods of metabolomic and proteomic analysis have significantly expanded the scope of this field.
Phenolic Compounds and Antioxidant, Antibacterial, and α-Amylase-/α-Glucosidase-Inhibitory Activities of Plant Species from the Genera Persicaria, Polygonum, and Fallopia · 2026 · DOIThe variation in sugar content and yeast nutrients in the fermentation must due to different amounts of apple and grape pomace. The need to optimize the fermentation process to produce beverages with desired characteristics. The challenge of detecting antioxidant capacities in the final wines using different methods, such as DPPH and FRAP assays.
Considerations and future work must acknowledge both the types of nitrogen sources and the amounts of nitrogen which might influence the completion of fermentation. Further studies may identify yeast strain preferences and correlation with the residual sugars in the fermented products from waste stream pomace. Further investigations may identify the presence of phenolic interactions during fermentation.
There is a need to understand how sterilization affects high-acidity vinegar. The current study fills this gap by examining the effects of thermal and non-thermal sterilization methods on the phytochemicals, flavor, and antioxidant properties of high-acidity mulberry vinegar.
Effects of Thermal and Non-Thermal Sterilization Methods on the Phytocompounds, Flavor Profile, and Antioxidant Properties of High Acidity Mulberry Vinegar · 2025 · DOIDespite a plethora of preclinical studies, more clinical trials are needed for a more appropriate treatment of CVD with polyphenols.
Cellular and Molecular Bases for the Application of Polyphenols in the Prevention and Treatment of Cardiovascular Disease · 2025 · DOIThe therapeutic potential of white grape pomace remains largely unexplored. There is a lack of studies on the effects of white grape pomace on blood pressure regulation, oxidative stress, and pro-inflammatory cytokine expression.
Beneficial Effects of White Grape Pomace in Experimental Dexamethasone-Induced Hypertension · 2025 · DOIThe antioxidative and anti-inflammatory effects of honeysuckle polyphenols on UVB-irradiated HaCaT cells are not well understood. The mechanism of honeysuckle polyphenols repairing UVB damage is not clear.
Chemical Characterization of Honeysuckle Polyphenols and Their Alleviating Function on Ultraviolet B-Damaged HaCaT Cells by Modulating the Nrf2/NF-κB Signaling Pathways · 2024 · DOIThe current understanding of interactive mechanisms of phytochemicals is limited. The optimal dosage requirements and potential side effects of phytochemicals are not well understood. The bioavailability and bioaccessibility of phytochemicals are important considerations.
Oxidative Stress: The Role of Antioxidant Phytochemicals in the Prevention and Treatment of Diseases · 2024 · DOIIt highlights the need for further research on the potential of polyphenols as preventive and therapeutic agents. The discussion extends to the impact of polyphenols on diverse health concerns such as hypertension, allergies, aging, and chronic diseases.
Dietary Polyphenols: Review on Chemistry/Sources, Bioavailability/Metabolism, Antioxidant Effects, and Their Role in Disease Management · 2024 · DOIThe paper does not explicitly state a research gap, but it discusses the importance of understanding the chemistry, sources, bioavailability, metabolism, antioxidant effects, and role in disease management of dietary polyphenols. It highlights the need for further research on the potential of polyphenols as preventive and therapeutic agents.
Dietary Polyphenols: Review on Chemistry/Sources, Bioavailability/Metabolism, Antioxidant Effects, and Their Role in Disease Management · 2024 · DOIInvestigate the long-term effects of DRPBE and RPBE on learning and memory, - Examine the effects of DRPBE and RPBE on other cognitive functions, - Study the effects of DRPBE and RPBE on female Sprague-Dawley…
Depolymerized red pine (Pinus densiflora Sieb. et Zucc.) bark extract attenuates scopolamine-induced learning and memory deficits in Sprague–Dawley rats · 2026 · DOIClinical trials investigating carotenoid interventions in obese populations have yielded substantially more modest outcomes compared to animal models - Limited understanding of carotenoid metabolism and bioavailability in metabolic diseases - Heterogeneity in carotenoid species, food matrices, doses, co-phytochemicals, populations and outcome…
Advanced analytical characterization combined with mechanistic and application-oriented studies will be essential for translating the enormous phytochemical diversity of plants into reproducible, safe and effective products, - Further development of plant-derived ingredients for food, nutraceutical, pharmaceutical and cosmetic applications, - Continuing research into naturally occurring bioactive compounds…
Special Issue on “Phytochemical Analysis and Evaluation of Antioxidant Properties in Medicinal Plants” · 2026 · DOIThe study only evaluated the iron-chelating, antioxidant, and anti-inflammatory properties of hazelnut extracts, - The study used simulated gastric and intestinal conditions, - The study used a limited number of hazelnut varieties, - The study did not evaluate the effects of hazelnut extracts on human…
Hazelnut and Defatted Hazelnut Pulp Extracts as Natural Iron Chelators: Iron-Chelating, Antioxidant, and Anti-Inflammatory Properties in Iron Overload · 2026 · DOIInvestigate the effects of hazelnut extracts on human subjects, - Evaluate the iron-chelating, antioxidant, and anti-inflammatory properties of other natural compounds, - Investigate the potential applications of hazelnut extracts in the treatment of iron overload…
Hazelnut and Defatted Hazelnut Pulp Extracts as Natural Iron Chelators: Iron-Chelating, Antioxidant, and Anti-Inflammatory Properties in Iron Overload · 2026 · DOIFurther studies could investigate the effects of environmental factors on the phytochemical composition, - the potential toxicity of the extracts could be examined, - the study of other parts of the plants could provide additional…
Phenolic Compounds and Antioxidant, Antibacterial, and α-Amylase-/α-Glucosidase-Inhibitory Activities of Plant Species from the Genera Persicaria, Polygonum, and Fallopia · 2026 · DOIInvestigate the long-term effects of consuming turmeric-enriched yogurt, - Evaluate the effects of turmeric-enriched yogurt on human health, - Assess the stability of turmeric-enriched yogurt during storage…
Short exposure to hypertension limited our evaluation of the effects of white GP polyphenol extracts on hypertensive heart disease, - The lack of evaluation of the oxidative stress parameters and pro-inflammatory cytokines from the aortic wall could be regarded as a potential limitation of the present…
Beneficial Effects of White Grape Pomace in Experimental Dexamethasone-Induced Hypertension · 2025 · DOIThe low bioavailability of resveratrol limits its efficacy - High costs, extended timelines, and ethical concerns limit in vivo animal studies - Challenges associated with in vivo studies underscore the need for more thorough and dependable in vitro…
Oxidative Stress: The Role of Antioxidant Phytochemicals in the Prevention and Treatment of Diseases · 2024 · DOI
Most-cited papers in Phytochemicals and Antioxidant Activities
- Plant flavonoids: Classification, distribution, biosynthesis, and antioxidant activity · Food Chemistry · 2022 · 2,024 citations
- Plant Flavonoids: Chemical Characteristics and Biological Activity · Molecules · 2021 · 1,407 citations
- Inhibition of oxidation of human low-density lipoprotein by phenolic substances in red wine · The Lancet · 1993 · 1,209 citations
- Extraction of phenolic compounds: A review · Current Research in Food Science · 2021 · 1,121 citations
- Dietary Polyphenols and Their Role in Oxidative Stress-Induced Human Diseases: Insights Into Protective Effects, Antioxidant Potentials and Mechanism(s) of Action · Frontiers in Pharmacology · 2022 · 1,035 citations
- Dietary Flavonoids, Antioxidant Vitamins, and Incidence of Stroke · Archives of Internal Medicine · 1996 · 914 citations
- Polyphenols and Human Health: The Role of Bioavailability · Nutrients · 2021 · 873 citations
- Anthocyanins: Factors Affecting Their Stability and Degradation · Antioxidants · 2021 · 853 citations
- Role of Phenolic Compounds in Human Disease: Current Knowledge and Future Prospects · Molecules · 2021 · 785 citations
- Dietary flavonoids, antioxidant vitamins, and incidence of stroke: the Zutphen study · Archives of Internal Medicine · 1996 · 781 citations
Most recent work
- Dietary Polyphenols (Flavonoids) Derived from Plants for Use in Therapeutic Health: Antioxidant Performance, ROS, Molecular Mechanisms, and Bioavailability Limitations · International Journal of Molecular Sciences · 2026
- Polyphenol metabolites in fermented foods: biotransformation, bioavailability, and functional roles · Frontiers in Nutrition · 2026
- Redox Paradox of Polyphenols: Bioavailability, Hormesis, and Safety Concerns · Phytotherapy Research · 2026
- Antioxidant and Health-Related Effects of Tannins: From Agri-Food By-Products to Human and Animal Health · Antioxidants · 2026
- Organ-Specific LC–MS/MS Phenolic Profiling and Multifunctional Antioxidant and Enzyme Inhibitory Activities of Onosma sintenisii · Molecules · 2026
- Polyphenols from Byproducts: Their Applications and Health Effects · Antioxidants · 2026
- Protection of Anthocyanins by Food Matrix During Simulated Digestion: Comparative Analysis of Whole-Açaí Powder and Extracts · Foods · 2026
- Valorization of Agro-Food Plant Wastes: Bioactive Compound Profiles and Biotechnological Potential of Twenty Crops · Recycling · 2026
- Phytochemical characterization and correlation analysis of nutritional value in sweet pepper (Capsicum annuum L.) genotypes at various growth stages · Frontiers in Plant Science · 2026
- Flavonoids and Their Influence on the Gut Microbiome: Implications for Cardiovascular Health · Nutrition Bulletin · 2026
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