Antioxidant activities and phytochemicals of leaf extracts from 10 native rhododendron species in taiwan

Chi Yang Lin, Lei Chen Lin, Shang Tse Ho, Yu Tang Tung, Yen Hsueh Tseng, Jyh Horng Wu

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Abstract

Rhododendron, one of the most famous ornamental plants in the world, is traditionally a medicinal plant. However, the potential bioactivities of native Rhododendron in Taiwan have not been completely studied. In this study, the results revealed that Rhododendron pseudochrysanthum exhibited the best antioxidant activities among 10 native Rhododendron species in Taiwan. Furthermore, based on a bioactivity-guided isolation principle, nine specific phytochemicals were isolated and identified as (2R,3S)-catechin (1), (2R,3R)-epicatechin (1 ′), (2R,3R)-dihydromyricetin 3-O-β-l- arabinopyranoside (2), (2S,3S)-taxifolin 3-O-β-l-arabinopyranoside (2 ′), (2R,3R)-taxifolin 3-O-β-l-arabinopyranoside (3), myricetin 3-O-β-d-glucopyranoside (3 ′), rutin (4), hyperoside (5), and quercitrin (6). Of these compounds, 2 and 3 were found to be major bioactive compounds, and their concentrations in the n-butanol (BuOH) fraction were determined to be 52.0 and 67.3 mg per gram, respectively. These results demonstrated that methanolic extracts of Rhododendron pseudochrysanthum leaves have excellent antioxidant activities and great potential as a source for natural health products.

Original languageEnglish
Article number283938
JournalEvidence-based Complementary and Alternative Medicine
Volume2014
DOIs
Publication statusPublished - 2014
Externally publishedYes

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ASJC Scopus subject areas

  • Complementary and alternative medicine

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