<i>In vitro</i>antioxidant activity of black tea (<i>Camellia sinensis</i>L.) residue extract

Kim, Dong Chung

doi:10.3839/jabc.2019.038

Cited by 3 publications

(1 citation statement)

References 31 publications

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“…The polarity change of the extraction solution due to the mixing of distilled water and ethanol leads to an increase in the antioxidant effect of G. pentaphyllum and S. thunbergii extracts. In addition, this is consistent with the results reporting that water-soluble bioactive compounds produced by hot-water extraction from algae show less antioxidant activity and that extracts that use 50% ethanol show higher antioxidant activity, suggesting that the use of a binary solvent (water and ethanol) in producing bioactive compounds is beneficial in increasing the extraction yield [ 35 , 36 ].…”

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confidence: 90%

Effects of Sargassum thunbergii Extract on Skin Whitening and Anti-Wrinkling through Inhibition of TRP-1 and MMPs

et al. 2021

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Sargassum thunbergii has been traditionally used as an edible and medicinal material in oriental countries. However, the skin-whitening and anti-wrinkling effects of S. thunbergii have not yet been investigated. This study was conducted to establish optimal extraction conditions for the production of bioactive compounds with antioxidant activity as well as skin-whitening and anti-wrinkle effects using ultrasound-assisted extraction (UAE) in S. thunbergii. The extraction time (5.30~18.7 min), extraction temperature (22.4~79.6 °C), and ethanol concentration (0.0~99.5%), which are the main variables of the UAE, were optimized using a central composite design. Quadratic regression equations were derived based on experimental data and showed a high coefficient of determination (R2 > 0.85), demonstrating suitability for prediction. The optimal UAE condition for maximizing all dependent variables, including radical scavenging activity (RSA), tyrosinase inhibitory activity (TIA), and collagenase inhibitory activity (CIA), was identified as an extraction time of 12.0 min, an extraction temperature of 65.2 °C, and ethanol of 53.5%. Under these conditions, the RSA, TIA, and CIA of S. thunbergii extract were 86.5%, 88.3%, and 91.4%, respectively. We also confirmed S. thunbergii extract had inhibitory effects on the mRNA expression of tyrosinase-related protein-1, matrix metalloproteinase-1, and matrix metalloproteinase-9, which are the main genes of melanin synthesis and collagen hydrolysis. Liquid chromatography-tandem mass spectrometry was used to identify the main phenolic compounds in S. thunbergii extract, and caffeic acid was identified as a major peak, demonstrating that high value-added ingredients with skin-whitening and anti-wrinkling effects can be produced from S. thunbergii and used for developing cosmetic materials.

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Section: Resultssupporting

confidence: 90%

Effects of Sargassum thunbergii Extract on Skin Whitening and Anti-Wrinkling through Inhibition of TRP-1 and MMPs

et al. 2021

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Antioxidative activities of ethanolic extracts of Du-zhong (Eucommia ulmoidesOliver) leaf and bark

Kim

2020

JABC

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Antioxidative activities of 50% ethanolic extracts from Du-zhong (Eucommia ulmoides Oliver) leaf and bark were investigated. Yields of the leaf and bark extract were 8.1±0.31 and 17.4±0.89%, respectively. Polyphenol contents of the leaf and bark extract were 64.1±3.35 and 42.4±2.38 µg gallic acid equivalents/ mg, respectively. Flavonoid contents of the leaf and bark extract were 24.0±3.15 and 36.7±3.18 µg quercetin equivalents/mg, respectively. As concentration of the leaf and bark extract increased, their antioxidative activities proportionally increased. EC 50 values of the leaf and bark extract for cation radical scavenging were 560.6±17.65 and 1,357.4±8.45 µg/mL, respectively. EC 50 values of the leaf and bark extract for free radical scavenging were 574.2±14.70 and 2,103.1±108.59 µg/mL, respectively. EC 50 values of the leaf and bark extract for ferric reducing antioxidant power were 319.9±13.42 and 705.9±26.08 µg/mL, respectively. EC 50 values of the leaf and bark extract for nitrite scavenging were 2,329.2±35.11 and 5,467.6±243.92 µg/mL, respectively. In the presence of 74.8 µg/mL of the leaf extract and 177.2 µg/mL of the bark extract, linoleic acid peroxidation was inhibited by 70.0 and 79.1%, respectively. The Du-zhong leaf extract possessed higher antioxidative activities than its bark extract. Keywords Antioxidative activities • Du-zhong (Eucommia ulmoides Oliver) • Ethanolic extract • Flavonoid • Polyphenol 서 론 두충나무(Du-zhong, Eucommia ulmoides Oliver)의 잎과 껍질은 뛰어난 약리효과를 가지고 있어 동아시아 지역에서 천연 생약 재로 널리 사용되어 왔다[1]. 두충나무의 잎에는 폴리페놀, 플 라보노이드 및 triterpenoid의 생리활성 물질이 다량 함유되어 있 고[2], 두충나무 잎의 물 추출물은 우수한 항산화 활성을 가지 는 것으로 알려져 있다[3]. 두충나무 잎에 들어있는 폴리페놀 화합물로는 pyrogallol, ferulic acid, protocatechuic acid, coumaric acid 및 chlorogenic acid 등이 있고, 플라보노이드 화합물로는 quercetin, rutin, kaempherol 및 astragarin 등이 보고되었다[4].

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블랙티 증편의 품질특성

민

2024

Korean J. Food Cook. Sci

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In vitroantioxidant activity of black tea (Camellia sinensisL.) residue extract

Cited by 3 publications

References 31 publications

Effects of Sargassum thunbergii Extract on Skin Whitening and Anti-Wrinkling through Inhibition of TRP-1 and MMPs

Effects of Sargassum thunbergii Extract on Skin Whitening and Anti-Wrinkling through Inhibition of TRP-1 and MMPs

Antioxidative activities of ethanolic extracts of Du-zhong (Eucommia ulmoidesOliver) leaf and bark

블랙티 증편의 품질특성

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