Highly Sensitive Determination of Capsaicin Based on Nitrogen-Doped Graphene Oxide Modified Carbon Paste Electrode

doi:10.7506/spkx1002-6630-201722032

Abstract

Abstract: Nitrogen-doped graphene oxide (NGO) was synthesized by a one-step hydrothermal method and characterized by X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). A NGO modified carbon paste electrode (NGO/CPE) was prepared, and the electrochemical behaviors of capsaicin at NGO/CPE were studied. Experimental results showed that the voltammetric response of capsaicin at NGO/CPE was greatly improved when compared with bare carbon paste electrode (CPE). Some parameters such as NGO concentration, accumulation time and pH were optimized. Capsaicin was determined by using differential pulse voltammetry. Under optimal conditions, the peak current was linearly proportional to capsaicin concentration in the range of 5.0 to 1 200 μg/L, with a limit of detection (LOD) of 2.0 μg/L (RSN = 3). The proposed method was applied for the determination of capsaicin in hot pepper samples, and the results well agreed with those obtained by colorimetry.

Key words: nitrogen-doped graphene oxide, capsaicin, modified electrode, electroanalysis, differential pulse voltammetry

CLC Number:

O657.1

YA Yu, JIANG Cuiwen, LI Tao, TANG Li, NING Dejiao, YAN Feiyan, XIE Liping. Highly Sensitive Determination of Capsaicin Based on Nitrogen-Doped Graphene Oxide Modified Carbon Paste Electrode[J]. FOOD SCIENCE, 2017, 38(22): 211-215.

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Highly Sensitive Determination of Capsaicin Based on Nitrogen-Doped Graphene Oxide Modified Carbon Paste Electrode

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