摘要
采用毛细管区带电泳-电化学检测法（CE-ED）同时测定了洋葱中芥子酸、槲皮索和原儿茶酸的含量，研究了电极电位、运行液浓度和分离电压等实验参数对分离检测的影响．在优化的条件下，以直径300μm的碳圆盘电极为工作电极，电极电位为＋950mV（vs．SCE），在pH9．0的40mmol／L的硼酸运行缓冲液中，上述3组分在25min内可完全分离．芥子酸、槲皮素和原儿荼酸的浓度分别在2．0×10^-7～1．0×10^-4g／mL、2．0×10^-7～5．0×10^-5g／mL和5．0×10^-7～5．0×10^-5g／mL的范围内与峰电流呈良好线性关系，检测下限分别为1．5×10^-7g／mL、1．6×10^-7g／mL和3．6×10^-7g／mL，7次测得的三种组分峰高的相对标准偏差分别为2．70％、4．65％和1．73％，三次测得的平均回收率分别为102．2％、105．5％和100．9％．
A simultaneous determination of sinapic acid, quercetin and protocatechuic acid in Allium cepa Linn by capillary aone electrophoresis with electrochemical detection was reported. The parameters affecting the separation and detection such as detection potential, separation voltage and concentration of running buffer were evaluated. Under the optimum conditions, the analytes were baseline separated within 25 min in a borax buffer （PH = 9.0）. Good linear rela tionship was established between peak current and concentration of analytes in the range of 2.0×10^-7～1.0×10^-4g/mL for sinapic acid,2.0×10^-7～5.0×10^-5g/mL for quercetin, and 5.0×10^-7～5.0×10^-5g/mLfor protocateehuic acid. The detection limit （S/N=3） is 1.5×10^-7g/mL, 1.6×10^-7 g/mL and 3.6×10^-7 g/mL respectively for these three analytes. This method has been used for the determination of active ingredients in allium cepa linn with satisfactory results.
出处
《华东师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2006年第2期13-17,共5页
Journal of East China Normal University(Natural Science)
基金
国家自然科学基金(20375013)
关键词
毛细管区带电泳
电化学检测
芥子酸
槲皮素
原儿茶酸
洋葱
capillary zone electrophoresis
electrochemical detection
sinapic acid
quercetin
protocatechuic acid
Allium cepa Linn
