DPPH free-radical scavenging activity, total phenolic contents and chemical composition analysis of forty-two kinds of essential oils

Lin, Changbin; Yu, Changhao; Wu, Shuang; Yih, Kuang-Hway

doi:10.38212/2224-6614.2594

Cited by 34 publications

(28 citation statements)

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“…The results of the DPPH assay are shown in Table 2. Thymol had a higher radical scavenging ability than carvacrol, which is consistent with the results reported previously [36]. Compound 6 showed the highest radical scavenging ability.…”

Section: Resultssupporting

confidence: 92%

Effect of Side Chain Functional Groups on the DPPH Radical Scavenging Activity of Bisabolane-Type Phenols

et al. 2019

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Methods for improving the antioxidant activity of phenolic compounds have been widely investigated; however, most studies have focused on the structure–activity correlations of substituents on the aromatic rings of catechols or flavonoids. We investigated the influence of side chain functional groups on the 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity of xanthorrhizol and curcuphenol analogues. These compounds were synthesised by the side chain functional group conversion of curcumene, followed by direct oxidation of the aromatic ring. We determined the DPPH radical scavenging activity from the half-maximal effective concentration (EC50) obtained from a DPPH assay in methanol. The positional relationships of the side chain with the aromatic ring and phenolic OH group were determined using density functional theory calculations, and the stability of different conformations was compared. Electron transfer-proton transfer was determined to be the dominant mechanism in the DPPH reaction with xanthorrhizol analogues, based on the correlation between the EC50 and ionisation potential. The radical cation was greatly stabilised in the structure where the side chain functional group was close to the aromatic ring. Stabilisation also depended on the phenolic OH group position. In future antioxidant design, aromatic ring substituent conversion and the use of functional groups far from the OH group or ring should be explored.

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Section: Resultssupporting

confidence: 92%

Effect of Side Chain Functional Groups on the DPPH Radical Scavenging Activity of Bisabolane-Type Phenols

et al. 2019

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“…Hence, HE-HWA which is water soluble could give a higher TPC but lower DPPH scavenging activity due to their solvent preferences [48]. In addition, hot water extraction as the name suggests, could deactivate or degrade the heat-labile antioxidant components hence explain why HE-HWA did not get the better of HE-ETH in DPPH scavenging assay regardless of its higher TPC [49,50,51].…”

Section: Discussionmentioning

confidence: 99%

Lion’s Mane Mushroom, Hericium erinaceus (Bull.: Fr.) Pers. Suppresses H2O2-Induced Oxidative Damage and LPS-Induced Inflammation in HT22 Hippocampal Neurons and BV2 Microglia

et al. 2019

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Oxidative stress and inflammation in neuron-glia system are key factors in the pathogenesis of neurodegenerative diseases. As synthetic drugs may cause side effects, natural products have gained recognition for the prevention or management of diseases. In this study, hot water (HE-HWA) and ethanolic (HE-ETH) extracts of the basidiocarps of Hericium erinaceus mushroom were investigated for their neuroprotective and anti-inflammatory activities against hydrogen peroxide (H2O2)-induced neurotoxicity in HT22 mouse hippocampal neurons and lipopolysaccharide (LPS)-induced BV2 microglial activation respectively. HE-ETH showed potent neuroprotective activity by significantly (p < 0.0001) increasing the viability of H2O2-treated neurons. This was accompanied by significant reduction in reactive oxygen species (ROS) (p < 0.05) and improvement of the antioxidant enzyme catalase (CAT) (p < 0.05) and glutathione (GSH) content (p < 0.01). Besides, HE-ETH significantly improved mitochondrial membrane potential (MMP) (p < 0.05) and ATP production (p < 0.0001) while reducing mitochondrial toxicity (p < 0.001), Bcl-2-associated X (Bax) gene expression (p < 0.05) and nuclear apoptosis (p < 0.0001). However, gene expression of Nuclear factor erythroid 2-related factor 2 (Nrf2), heme oxygenase 1 (HO-1) and NAD(P)H quinone dehydrogenase 1 (NQO1) were unaffected (p > 0.05). HE-ETH also significantly (p < 0.0001) reduced nitric oxide (NO) level in LPS-treated BV2 indicating an anti-inflammatory activity in the microglia. These findings demonstrated HE-ETH maybe a potential neuroprotective and anti-inflammatory agent in neuron-glia environment.

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“…5 shows that at day 7, the coverage with a higher concentration of cinnamon essential oil has greater antioxidant power, it can be justified by the addition of the essential oil [31]; where the antioxidant activity increases as the cinnamon concentration increases [33]. It has been reported that eugenol is the main component responsible for the radical uptake capacity of cinnamon bark essential oil, demonstrating a much higher DPPH radicals uptake capacity than cinnamaldehyde [37]. Finally, antioxidant capacity and phenolic compounds concentration behaviour could be corelated (Fig.…”

Section: Antioxidant Capacitymentioning

confidence: 99%

Coverage of chitosan and essential cinnamon oil for strawberry conservation (Fragaria ananassa) var. Aroma, minimally processed

León-Vargas¹,

Bocanegra²,

Linares³

et al. 2020

Proceedings of the 18th LACCEI International Multi-Conference for Engineering, Education, and Technology: Engineering, Integrat

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The use of edible coverage represents one of the important methods used to preserve the quality of minimally processed products. The aim of this research was to determine the effect of chitosan and essential cinnamon oil coverage in the phenolic content, antioxidant capacity, mould and yeast count, and general acceptability in minimally processed strawberry along 16 days of refrigerated storage at 10 °C, in order to improve the conservation and characteristics of minimally processed strawberry var. aroma. In this experiment a response surface methodology using a Central Composite Rotational Design (CCRD) was carried out; the variable ranges used were 0.7-2% (Chitosan) and 0.02-0.1% (cinnamon essential oil). As results, it was found that the significant variable (p<0.05) was cinnamon essential oil for both phenols content and antioxidant capacity. For these characteristics, a concentration of 0.1% cinnamon essential oil was the most effective. The antioxidant capacity and phenolic contents showed an increase during the first 7 days of storage, decreasing after that for all treatments. It was also found that both independent variables significantly influence (p<0.05) in the decrease of microbial load being the optimal range of chitosan (1.33-1.71%) and cinnamon essential oil (0.056-0.087%). In addition, the use of coverage of chitosan and cinnamon essential oil does not negatively affect the sensory acceptability and helps to maintain the shelf life of minimally processed strawberry.

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DPPH free-radical scavenging activity, total phenolic contents and chemical composition analysis of forty-two kinds of essential oils

Cited by 34 publications

References 0 publications

Effect of Side Chain Functional Groups on the DPPH Radical Scavenging Activity of Bisabolane-Type Phenols

Effect of Side Chain Functional Groups on the DPPH Radical Scavenging Activity of Bisabolane-Type Phenols

Lion’s Mane Mushroom, Hericium erinaceus (Bull.: Fr.) Pers. Suppresses H2O2-Induced Oxidative Damage and LPS-Induced Inflammation in HT22 Hippocampal Neurons and BV2 Microglia

Coverage of chitosan and essential cinnamon oil for strawberry conservation (Fragaria ananassa) var. Aroma, minimally processed

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