Four new antioxidant phenylpropanoid glycosides from Microlepia pilosissima |
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Authors: | Jiang Hu Xiaodong Shi Jiangang Chen |
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Affiliation: | 1. College of Biological Resources and Environment Science, Qujing Normal University, Qujing, 655011, Yunnan, China 2. Qujing Characteristic Food Research Institute, Qujing Normal University, Qujing, 655011, Yunnan, China 3. College of Biological Resources and Environment Science, Qujing Normal University, Sanjiang Avenue, Unicorn District, Qujing, 655011, Yunnan, China
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Abstract: | Four new phenylpropanoid glycosides, 9-O-[β-D-glucopyranosyl-(1→2)-α-L-rhamnopyranosyl]-3,4-dimethoxy-cinnamic acid (1), 9-O-[β-D-glucopyranosyl-(1→2)-α-L-rhamnopyranosyl]-4-methoxycinnamic acid (2), 9-O-α-L-rhamnopyranosyl-3,4-dimethoxy-cinnamic acid (3), and 9-O-[6-Oacetyl-β-D-glucopyranosyl]-4-methoxy-cinnamic acid (4), together with three known compounds 9-O-α-L-rhamnopyranosyl-4-hydroxy-cinnamic acid (5), 9-O-β-D-glucopyranosyl-4-methoxycinnamic acid (6), and 9-O-β-D-glucopyranosyl-3,4-dimethoxy-cinnamic acid (7) were isolated from the 70% EtOH extract of the dry fronds of Microlepia pilosissima. Their chemical structures were elucidated by spectroscopic analysis. Moreover, 1 and 2 exhibited comparable scavenging activities with (±)-α-tocopherol against DPPH radicals, while compounds 3–7 displayed moderate antioxidant activities. |
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