Highly sensitive determination of capsaicin using a carbon paste electrode modified with amino-functionalized mesoporous silica

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• 作者：Yu Ya^a ; ^b ; Leixing Mo^a ; ^b ; ¹ ; Tianshun Wang^a ; ^b ; Yegeng Fan^a ; ^b ; Jie Liao^a ; ^b ; Zhongliang Chen^a ; ^b ; Kumar Srivastava Manoj^c ; Fengxue Fang^a ; ^b ; Chunya Li^d ; Jun Liang^a ; ^c ; ^{jliangsugar@gmail.com}
• 关键词：Amino-functionalized mesoporous silica ; Modified electrode ; Capsaicin ; Voltammetry
• 刊名：Colloids and Surfaces B ; Biointerfaces
• 出版年：2012
• 期刊代码：14_09277765
• 类别：ms
• 出版时间：15 June, 2012
• 卷：95
• 期：Complete
• 页码：90-95
• 文件大小：781 K

摘要

Mesoporous silica (MS) and amino-functionalized mesoporous silica (NH₂-FMS) were prepared and characterized using the techniques of transmission electron microscopy (TEM) and nitrogen adsorption-desorption. Voltammetry was used to investigate the electrochemical behavior of capsaicin at the amino-functionalized mesoporous silica, which was modified through carbon paste electrode (NH₂-FMS/CPE). NH₂-FMS/CPE showed better performance for the electrochemical oxidation of capsaicin, when compared with bare carbon paste electrode (CPE) and mesoporous silica modified carbon paste electrode (MS/CPE). We optimized the experimental conditions influencing the determination of capsaicin. Under optimal conditions, the oxidation peak current was proportional to capsaicin concentration in the range of 0.040-0.40 渭mol L^鈭?and 0.40-4.0 渭mol L^鈭?, when the detection limit was 0.020 渭mol L^鈭? (S/N = 3). The above method was successfully applied to determine capsaicin in hot pepper samples, yielding satisfactory results. The spiked recoveries were in the range of 93.1-100.7%.