摘要
利用K2S2O8存在下槲皮素于-1.38V(vs.SCE)产生的极谱催化波,拟定了测定槲皮素的新方法。在0.02mol/L酒石酸-酒石酸钠(pH2.7)-1.0×10-2mol/LK2S2O8底液中,槲皮素催化波的峰电位为-1.38V(vs.SCE),其二阶导数峰电流与槲皮素浓度在1.0×10-7～2.0×10-6mol/L范围内呈线性关系(r=0.9984,n=6)。4.0×10-7mol/L槲皮素催化波的峰电流约为相应还原波峰电流的50倍。应用本方法直接测定良姜中的槲皮素,结果令人满意。
Based on a polarographic catalytic wave of quercetin with the peak potential -1.38 V (vs. SCE) in 0.02 mol/L tartaric acid-sodium tartrate (pH 2.7) -1.0×10-2 mol/L K2S2O8 supporting electrolyte, a polarographic method is proposed for the determination of quercetin. The linearity between second-order derivative peak current of the catalytic wave and quercetin concentration is obtained in the range 1.0×10-7 ～2.0×10-6 mol/L (r = 0.9984, n = 6). The polarographic current of the catalytic wave for 4.0×10-7 mol/L quercetin is improved by about 50 times as compared with that of the corresponding reduction wave. The proposed method has been used to direct determination of quercetin in Alpinia officinarum after diluting the ethanol extract with water.
出处
《咸阳师范学院学报》
2003年第2期21-23,共3页
Journal of Xianyang Normal University
基金
陕西省自然科学基金资助项目(编号:2002B01)
陕西省教育厅专项科研基金资助项目(编号:02JK059).
