title: Highly sensitive determination of capsaicin using a carbon paste electrode modified with amino-functionalized mesoporous silica.
abstract: Mesoporous silica (MS) and amino-functionalized mesoporous silica (NH(2)-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 (NH(2)-FMS/CPE). NH(2)-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 μmol L(-1)and 0.40-4.0 μmol L(-1), when the detection limit was 0.020 μmol L(-1) (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%.
authors.affiliation: Quality Inspection and Test Center for Sugarcane and Its Product, China Ministry of Agriculture (Nanning), Nanning 530007, PR China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Ya
authors.forename: Leixing
authors.initials: L
authors.lastname: Mo
authors.forename: Tianshun
authors.initials: T
authors.lastname: Wang
authors.forename: Yegeng
authors.initials: Y
authors.lastname: Fan
authors.forename: Jie
authors.initials: J
authors.lastname: Liao
authors.forename: Zhongliang
authors.initials: Z
authors.lastname: Chen
authors.forename: Kumar Srivastava
authors.initials: KS
authors.lastname: Manoj
authors.forename: Fengxue
authors.initials: F
authors.lastname: Fang
authors.forename: Chunya
authors.initials: C
authors.lastname: Li
authors.forename: Jun
authors.initials: J
authors.lastname: Liang
mesh_terms: D000327:Adsorption; D000588:Amines / Q000737:chemistry*; D002211:Capsaicin / Q000032:analysis*; D002244:Carbon / Q000737:chemistry*; D055664:Electrochemical Techniques; D004566:Electrodes; D046529:Microscopy, Electron, Transmission; D015394:Molecular Structure; D009584:Nitrogen / Q000737:chemistry; D010084:Oxidation-Reduction; D010316:Particle Size; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D000588:Amines; D002244:Carbon; D012822:Silicon Dioxide; D009584:Nitrogen; D002211:Capsaicin