基于Nafion膜的柱层析纯化过程的电化学在线检测器
电化学检测一般需加入电解质以降低溶液电阻,为解决天然药在层析纯化检测中无支持电解质的问题,研制了一种以液体石蜡-石墨为工作电极的电化学在线检测器,利用了Nafion N-324膜固体酸的性质,在不额外添加电解质的情况下,直接获得了杨梅素80%乙醇溶液(V/V)的循环伏安图。在恒电位0.53V下,实现了对层析液中有效物质的电化学在线检测。在2×10-5~1×10-2 mol/L范围内,峰面积(A)与杨梅素浓度(C)存在线性关系,线性方程为A=2.7227C+0.4341,r=0.9976。在恒电位0.62V无支持电解质的80%乙醇溶液中,对30%竹叶黄酮粗提品纯化过程的在线检测,获得了时间-电流...
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Published in | 分析化学 Vol. 40; no. 5; pp. 675 - 680 |
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Main Author | |
Format | Journal Article |
Language | Chinese |
Published |
浙江工业大学化学工程与材料学院,杭州,310014%浙江工业大学药学院,杭州,310014
2012
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Subjects | |
Online Access | Get full text |
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Summary: | 电化学检测一般需加入电解质以降低溶液电阻,为解决天然药在层析纯化检测中无支持电解质的问题,研制了一种以液体石蜡-石墨为工作电极的电化学在线检测器,利用了Nafion N-324膜固体酸的性质,在不额外添加电解质的情况下,直接获得了杨梅素80%乙醇溶液(V/V)的循环伏安图。在恒电位0.53V下,实现了对层析液中有效物质的电化学在线检测。在2×10-5~1×10-2 mol/L范围内,峰面积(A)与杨梅素浓度(C)存在线性关系,线性方程为A=2.7227C+0.4341,r=0.9976。在恒电位0.62V无支持电解质的80%乙醇溶液中,对30%竹叶黄酮粗提品纯化过程的在线检测,获得了时间-电流信号的流出曲线,可用于实际样品分析。 |
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Bibliography: | TANG Yu-Hang,LIU Wen-Han ,TENG Yuan-Jie,QIAN Jun-Qing,MA Chun-An (College of Chemical Engineering and Material Science, Zhejiang University of Technology,Hangzhou 310014,China) 2(College of Pharmaceutical Sceience,Zhejiang University of Technology,Hangzhou 310014,China) Natural medicine; Nafion membrane; Antioxidant of bamboo leaves; Cyclic Voltammetry; Micro-gap flow Cell; Paraffin-graphite powder electrode Electrolyte is always added to decrease the resistance of solution during the electrochemical detection.An online electrochemical detector based on paraffin-graphite powder electrode was deve-loped,because the chromatographic detection of active ingredients of natural medicine usually has no electrolyte.The cyclic voltammograms of myricetin(80%,V/V) ethanol-water as mobile phase) is obtained directly without any additional electrolyte by utilizing the solid acid characteristic of nafion N-324 membrane in this micro-gap flow cell.Peristaltic pump stimulates the chromatographic process,and then it realizes th |
ISSN: | 0253-3820 |
DOI: | 10.3724/SP.J.1096.2012.10856 |