Investigation and Comparison of Antioxidant Potential of Catechins Present in Green Tea: DFT Study

Wijesooriya, Sanduni S.; Pandithavidana, Dinesh R.

doi:10.23939/chcht16.04.591

Cited by 4 publications

(1 citation statement)

References 55 publications

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“…According to the literature, the phenolic compounds found in green tea are rich in catechins. Epigallocatechin-3-gallate (EGCG) is one of the most abundant and has been identified as having the highest antioxidant potential compared to the others [21]. Moreover, amino acids which play an important role in the chemical composition of green tea, and thus in the taste of tea, also exhibit significant antioxidative properties.…”

Section: Hptlc Bioassay Profilingmentioning

confidence: 99%

Bioassay-Guided Assessment of Antioxidative, Anti-Inflammatory and Antimicrobial Activities of Extracts from Medicinal Plants via High-Performance Thin-Layer Chromatography

Jović,

Agatonovic-Kustrin,

Ristivojević

et al. 2023

Molecules

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Natural products and their analogues have contributed significantly to treatment options, especially for anti-inflammatory and infectious diseases. Thus, the primary objective of this work was to compare the bioactivity profiles of selected medicinal plants that are historically used in folk medicine to treat inflammation and infections in the body. Chemical HPTLC fingerprinting was used to assess antioxidant, phenolic and flavonoid content, while bioassay-guided HPTLC was used to detect compounds with the highest antibacterial and anti-inflammatory activities. The results of this study showed that green tea leaf, walnut leaf, St. John’s wort herb, wild thyme herb, European goldenrod herb, chamomile flower, and immortelle flower extracts were strong radical scavengers. Green tea and nettle extracts were the most active extracts against E. coli, while calendula flower extract showed significant potency against S. aureus. Furthermore, green tea, greater celandine, and fumitory extracts exhibited pronounced potential in suppressing COX-1 activity. The bioactive compounds from the green tea extract, as the most bioactive, were isolated by preparative thin-layer chromatography and characterized with their FTIR spectra. Although earlier studies have related green tea’s anti-inflammatory properties to the presence of catechins, particularly epigallocatechin-3-gallate, the FTIR spectrum of the compound from the most intense bioactive zone showed the strongest anti-inflammatory activity can be attributed to amino acids and heterocyclic compounds. As expected, antibacterial activity in extracts was related to fatty acids and monoglycerides.

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Section: Hptlc Bioassay Profilingmentioning

confidence: 99%

Bioassay-Guided Assessment of Antioxidative, Anti-Inflammatory and Antimicrobial Activities of Extracts from Medicinal Plants via High-Performance Thin-Layer Chromatography

Jović,

Agatonovic-Kustrin,

Ristivojević

et al. 2023

Molecules

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Bio‐based and effective: Cardanol‐piperidine derivatives for enhanced polypropylene resistance against thermo‐ and photo‐oxidative aging

Zeng,

Feng,

et al. 2024

Vinyl Additive Technology

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Bio‐based antioxidants have garnered attention for their sustainability and environmental benefits. In this study, we designed and synthesized three cardanol‐piperidine derivatives (HSs) by utilizing hydrogenated cardanol (HC) and piperidine derivatives to improve the aging inhibition of polypropylene (PP). These bio‐based antioxidants were intended as eco‐friendly alternatives to conventional synthetic antioxidants. The impact of these HSs on the thermal stability, thermo‐oxidative stability, and light stability of PP was thoroughly evaluated. The results unveiled that after 5 h of interaction with 2,2‐diphenyl‐1‐picrylhydrazyl free radical, HSs exhibited a remarkable over 5‐fold increase in free radical scavenging efficiency as compared to HC. Moreover, the addition of HSs significantly increased the oxidation induction time and the initial oxidation temperature compared to pristine PP. After photo‐oxidative aging and thermo‐oxidative aging, the HS‐dosed PP demonstrated remarkable retention of elongation at break, reaching more than 72% and 69%. From the comparison with physical mixtures and the density functional theory calculations, an intramolecular synergism mechanism is proposed. The intramolecular synergism between hydrogenated cardanol and piperidine derivatives may be the main reason for the inhibition of PP aging.Highlights A method for constructing simultaneous efficient light, thermal, and oxygen stable polypropylene. The mechanism for achieving simultaneous stabilization of light, heat, and oxygen is the intramolecular synergy of phenol piperidine. The essence of intramolecular synergy of cardanol and piperidine derivatives is its' reduced hydrogen bond dissociation energy and energy gap.

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Optimized Baccharis dracunculifolia extract as photoprotective and antioxidant: In vitro and in silico assessment

Vilas-Boas

Silva

Accioli

et al. 2023

Journal of Photochemistry and Photobiology A: Chemistry

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Investigation and Comparison of Antioxidant Potential of Catechins Present in Green Tea: DFT Study

Cited by 4 publications

References 55 publications

Bioassay-Guided Assessment of Antioxidative, Anti-Inflammatory and Antimicrobial Activities of Extracts from Medicinal Plants via High-Performance Thin-Layer Chromatography

Bioassay-Guided Assessment of Antioxidative, Anti-Inflammatory and Antimicrobial Activities of Extracts from Medicinal Plants via High-Performance Thin-Layer Chromatography

Bio‐based and effective: Cardanol‐piperidine derivatives for enhanced polypropylene resistance against thermo‐ and photo‐oxidative aging

Optimized Baccharis dracunculifolia extract as photoprotective and antioxidant: In vitro and in silico assessment

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