کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1208962 | 1493751 | 2007 | 5 صفحه PDF | دانلود رایگان |

Upright counter-current chromatography (CCC) with a two-phase solvent system composed of n-hexane–ethyl acetate–methanol–water (1:2:1:2, v/v/v/v) was applied to the isolation and purification of polyphenols from the roots of Parthenocissus laetevirens. Two cis-trans isomeric resveratrol dimers – quadrangularin A and parthenocissin A – were obtained from the crude sample in a one-step separation, with purities of 95.4 and 97.6%, respectively, as determined by HPLC. The structures of these two compounds were identified by 1H NMR and 13C NMR. Furthermore, their antioxidant activities were determined by β-carotene bleaching assay. The antioxidant activities of quadrangularin A and parthenocissin A were higher than that of vitamin C in this model.
Journal: Journal of Chromatography A - Volume 1151, Issues 1–2, 1 June 2007, Pages 175–179