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Open research questions in Phytochemicals and Antioxidant Activities

228 unresolved questions extracted from the limitations and future-work sections of 1,168 Phytochemicals and Antioxidant Activities papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • The study acknowledges the lack of authentic reference standards for all identified compounds. The use of a single internal standard does not fully account for differences in ionization efficiency and matrix effects across structurally diverse compounds. The need for effective biorecycling systems in developing countries such as Yemen.

    Comparative antioxidant recovery evaluation of ultrasound and supercritical CO₂ Yemeni red onion peel extractions with LC-ESI-MS/MS profiling of ultrasound-assisted extracts · 2026 · DOI

  • Further studies on the optimization of SC-CO₂ extraction conditions - Investigation of the potential applications of the identified compounds

    Comparative antioxidant recovery evaluation of ultrasound and supercritical CO₂ Yemeni red onion peel extractions with LC-ESI-MS/MS profiling of ultrasound-assisted extracts · 2026 · DOI

  • The study was conducted on wild accessions rather than plants grown under standardized conditions. The provinces were represented unequally in the morphological and TPC analyses. Limited availability of fruits during the sampling period and restricted size of natural populations in some provinces.

    Molecular Characterization of Natural Populations of Macleania rupestris (Kunth) in Southern Ecuador: Relationships Between Morphological Traits and Total Phenolic Content · 2026 · DOI

  • Future domestication of this underutilized Andean fruit species - Selection of promising genotypes for future propagation and cultivation - Postharvest studies to further understand the characteristics of M. rupestris

    Molecular Characterization of Natural Populations of Macleania rupestris (Kunth) in Southern Ecuador: Relationships Between Morphological Traits and Total Phenolic Content · 2026 · DOI

  • The phytochemical profile and sesquiterpenoid structural diversity of T. lanceolata are not fully understood. There is a need for natural antioxidants with potential health benefits. The potential of T. lanceolata as a source of natural antioxidants has not been fully explored.

    Tasmannioside A, a New Eudesmane Sesquiterpene Glycoside, and Antioxidant Phenolic Derivatives from Tasmannia lanceolata · 2026 · DOI

  • Previous reviews have limitations in scope or are outdated. There is a need for a comprehensive evaluation of the pharmacological properties and clinical relevance of vitexin and isovitexin. The potential therapeutic applications of vitexin and isovitexin need to be further explored.

    Dietary Flavonoids Vitexin and Isovitexin: New Insights into Their Functional Roles in Human Health and Disease Prevention · 2025 · DOI

  • One challenge is the underutilization of fruit by-products despite their richness in phenolic compounds. Another challenge is the need for efficient and sustainable methods for extracting phenolic acids from fruit by-products. The variability in the composition and distribution of phytochemicals within fruit tissues poses a challenge for standardizing extraction methods.

    Phenolic Acids from Fruit By-Products as Therapeutic Agents for Metabolic Syndrome: A Review · 2025 · DOI

  • There is a need for novel preventive strategies to address the growing global burden of metabolic syndrome. The literature lacks a comprehensive review of the phenolic acid composition of fruit-derived by-products and their biological activity in relation to metabolic syndrome.

    Phenolic Acids from Fruit By-Products as Therapeutic Agents for Metabolic Syndrome: A Review · 2025 · DOI

  • The extraction of polyphenols from plant-derived materials is contingent upon various factors. The lack of a single or standard extraction method determines the type of polyphenols recovered and their bioactivity. The isolation and fractionation of individual polyphenols are laborious and may lead to reduced integral activity.

    A Comprehensive Analytical Review of Polyphenols: Evaluating Neuroprotection in Alzheimer’s Disease · 2024 · DOI

  • There is no definitive cure or treatment for Alzheimer's disease. The potential therapeutic target of oxidative stress in AD remains underresearched. The extraction of polyphenols from plant-derived materials is contingent upon various factors, including extraction methods and chemical nature.

    A Comprehensive Analytical Review of Polyphenols: Evaluating Neuroprotection in Alzheimer’s Disease · 2024 · DOI

  • Further studies are needed to fully understand the therapeutic potential of vitexin and isovitexin. Research on the synthetic modification, green extraction technologies, and systems pharmacology of vitexin and isovitexin is necessary. Investigations into the clinical relevance and pharmacokinetics of vitexin and isovitexin are required.

    Dietary Flavonoids Vitexin and Isovitexin: New Insights into Their Functional Roles in Human Health and Disease Prevention · 2025 · DOI

  • Future research should focus on mapping microbial biotransformation pathways of polyphenols and their impact on health outcomes.

    Polyphenol metabolites in fermented foods: biotransformation, bioavailability, and functional roles · 2026 · DOI

  • lanceolata and provide preliminary in vitro evidence supporting further investigation of its phenolic constituents as natural antioxidants.

    Tasmannioside A, a New Eudesmane Sesquiterpene Glycoside, and Antioxidant Phenolic Derivatives from Tasmannia lanceolata · 2026 · DOI

  • is an endemic species of Türkiye whose phytochemical composition and biological activities remain insufficiently characterized at the organ level.

    Organ-Specific LC–MS/MS Phenolic Profiling and Multifunctional Antioxidant and Enzyme Inhibitory Activities of Onosma sintenisii · 2026 · DOI

  • Polyphenols, particularly anthocyanins, are associated with metabolic health benefits; however, whether anthocyanin extracts provide greater bioaccessibility than whole foods remain unclear.

    Protection of Anthocyanins by Food Matrix During Simulated Digestion: Comparative Analysis of Whole-Açaí Powder and Extracts · 2026 · DOI

  • It highlights substantial inter-individual variability linked to conflicting evidence, from synergistic effects enabling lower statin doses and reduced adverse events to potential exacerbation of side effects.

    Lipid-lowering statins and polyphenol-based supplementation: a scoping review on drug-food interaction potential · 2025 · DOI

  • At the clinical level, only five studies addressed statin-polyphenol interactions, yielding conflicting results on the potential enhancement of therapeutic efficacy and adverse effects.

    Lipid-lowering statins and polyphenol-based supplementation: a scoping review on drug-food interaction potential · 2025 · DOI

  • Although the Indian subcontinent harbours a vast natural population of Jamun, limited knowledge exists regarding superior genotypes.

    Multivariate assessment of morpho-biochemical and bioactive diversity in Syzygium cumini (L.) Skeels for the selection of superior genotype and breeding applications · 2025 · DOI

  • However, results from in vitro and in vivo studies still need to be further validated by human clinical trials.

    Anthocyanins and musculoskeletal diseases: mechanisms and therapeutic potential · 2025 · DOI

  • Objective To evaluate the association between dietary flavonoid intake and hypertension using nationally representative data, considering increasing global hypertension prevalence and inconsistent evidence on flavonoids’ protective effects.

    The relationship between dietary flavonoid intake and hypertension: a cross-sectional study from NHANES · 2025 · DOI

  • However, scientific evidence verifying its therapeutic potential is lacking until November 2024.

    LC-MS analysis and antioxidant, antibacterial, and antidiabetic activity of Jumli Marshi rice from Nepal: An in vitro and in silico investigation to validate their potential as a functional food · 2025 · DOI

  • Future research will focus on the innovative design of nano-delivery systems and structural modification based on artificial intelligence.

    Review: Enhancing the Bioavailability and Stability of Anthocyanins for the Prevention and Treatment of Central Nervous System-Related Diseases · 2025 · DOI

  • Since current investigations on the microbiological safety aspects of edible flowers are scarce, this review aims to provide an overview of the consumption of edible flowers and a discussion of their uses, health benefits, and risks, focusing on microbiological aspects.

    A Comprehensive Review of Edible Flowers with a Focus on Microbiological, Nutritional, and Potential Health Aspects · 2025 · DOI

  • Future research should focus on optimizing extraction protocols, clarifying pharmacokinetic behavior, and ensuring long-term safety in diverse applications.

    Bioactive Compounds, Technological Advances, and Sustainable Applications of Avocado (Persea americana Mill.): A Critical Review · 2025 · DOI

  • Carotenoids and other bioactive compounds remain underexplored, and challenges persist regarding standardization and scalability.

    Upcycled Orange Peel Ingredients: A Scoping Review on Phytochemical Composition, Extraction Techniques, and Biorefinery Strategies · 2025 · DOI

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228 open questions have been extracted from the limitations and future-work passages of 1,168 Phytochemicals and Antioxidant Activities papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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