ORIGINAL ARTICLES |
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Phenolic Constituents with Antioxidative, Tyrosinase Inhibitory and Anti-aging Activities from Dendrobium loddigesii Rolfe |
Rui-Jing Ma1,2, Liu Yang1,3, Xue Bai1, Jin-Yu Li1, Ming-Yan Yuan1,3, Ya-Qin Wang3, Yong Xie3, Jiang-Miao Hu1,3, Jun Zhou1 |
1 State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, People's Republic of China; 2 College of Pharmacy, Guilin Medical University, Guilin 541004, People's Republic of China; 3 R&D Center of Dr. Plant, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, People's Republic of China |
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Abstract Aqueous ethanol extracts of powdered stems of Dendrobium loddigesii afforded three new phenolics including threo-7-O-ethyl-9-O-(4-hydroxyphenyl)propionyl-guaiacylglycerol (1), (R)-4,5,4'-trihydroxy-3,3',α-trimethoxybibenzyl (2) and (S)-5,5',7-trihydroxy-3',4'-dimethoxyflavanone (3), together with eleven known analogues. Their structures were determined by extensive spectroscopic analysis. To identify natural antioxidants, whitening, and anti-aging agents, the abilities of these phenolics were assessed to scavenge the 1,2-diphenyl-2-picrylhydrazyl (DPPH) radical, their abilities to inhibit tyrosinase production, and their abilities to stimulate collagen production by human dermal fibroblasts-adult (HDFa) assay. It was found that compounds 1, 4-8, 13 and 14 exhibited significant DPPH radical scavenging activities, compound 10 exhibited tyrosinase inhibitory activity (IC50 37.904 μg/mL), and compound 9 showed significant collagen production with an EC50 value of 3.182 μg/mL. These results suggest that phenolic constituents from D. loddigesii may be candidate antioxidants, skin-whitening and/or anti-aging agents.
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Keywords
Dendrobium loddigesii
Phenolic constituents
Antioxidative
Tyrosinase inhibitory
Anti-aging
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Fund:This project was supported financially by the Yunnan Provincial Science and Technology Department (Nos. 2017ZF003-04, 2015HB093 and 2019HA001). Authors are grateful to the staff of the analytical group of the State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, for measurements of all spectra. |
Corresponding Authors:
Jiang-Miao Hu
E-mail: hujiangmiao@mail.kib.ac.cn
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Issue Date: 30 October 2019
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