Identification of Phenolic Antioxidants from Sword Brake Fern (Pteris ensiformis Burm.)

doi:10.1016/j.foodchem.2007.03.055

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標題:	Identification of Phenolic Antioxidants from Sword Brake Fern (Pteris ensiformis Burm.)
作者:	Yung-Husan Chen Fang-Rong Chang Yih-Jer Lin Lisu Wang Jinn-Fen Chen Yang-Chang Wu Ming-Jiuan Wu
貢獻者:	生物科技系
關鍵字:	Pteris ensiformis DPPH Caffeic acid Hispidin TEAC
日期:	2007
上傳時間:	2010-01-12 09:12:58 (UTC+8)
出版者:	Elsevier
摘要:	Sword Brake fern (Pteris ensiformis Burm.) is one of the most common ingredients of traditional herbal drinks in Taiwan. In an effort to identify antioxidants from the aqueous extract of Sword Brake fern (SBF), the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity-guided isolation was employed. Three new compounds, kaempferol 3-O-α-l-rhamnopyranoside-7-O-[α-d-apiofuranosyl-(1-2)-β-d-glucopyranoside] (1), 7-O-caffeoylhydroxymaltol 3-O-β-d-glucopyranoside (3) and hispidin 4-O-β-d-glucopyranoside (4), together with five known compounds, kaempferol 3-O-α-l-rhamnopyranosid-7-O-β-d-glucopyranoside (2), caffeic acid (5), 5-O-caffeoylquinic acid (6), 3,5-di-O-caffeoylquinic acid (7) and 4,5-di-O-caffeoylquinic acid (8) were isolated and determined on the basis of spectroscopic analyses. HPLC with UV detector was further employed to analyze the content of each compound in SBF based on the retention time by comparison with isolated pure compounds. It was found that the most abundant phenolic compound was compound 3, followed by compounds 7 and 4. The di-O-caffeoylquinic acids (7 and 8) have the strongest DPPH scavenging potential with IC50 around 10 μM and the highest Trolox equivalent antioxidant capacity (TEAC) about 2 mM. This data indicates that SBF is rich in phenolic antioxidants.
關聯:	Food Chemistry 105(1) ： p.48-56
显示于类别:	[生物科技系(所)] 期刊論文

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