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Simple and Sensitive Determination of Aromatic Acids in Coconut Water by g-C3N4@SiO2 Based Solid-phase Extraction and HPLC-UV Analysis

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Chemical Research in Chinese Universities 2018年第4期34卷 528-535页

作者： qiangba gezhen ZHU Gangtian YU Qiongwei FENG Yuqi Key Laboratory of Analytical Chemistry for Biology and Medicine Ministry of Education Department of Chemistry Wuhan University Wuhan 430072 P. R. China Key Laboratory of Tectonics and Petroleum Resources Ministry of Educan'on China University of Geosciences Wuhan 430075 P. R. China

In this study, graphitic carbon nitride deposited silica（g-C3N4@SiO2） was prepared by simple pyrolysis of melamine on silica and then used as a solid-phase extraction（SPE） sorbent for the extraction of four representative aromatic acids including benzoic acid（BA）, salicylic acid（SA）, indolyl-3-butyricacid（IBA） and naphthalene acetic acid（NAA） in coconut water（CW） samples, g-C3N4@SiO2 exhibited an excellent adsorption capacity for the four aromatic acids, which are in the concentration range of 500--558.8 gg/g. The four aromatic acids could be directly captured by g-C3N4@SiO2 from CW samples within 5 rain. Thus, a rapid, simple and effective method for the analy- sis of four aromatic acids in CW samples was developed by coupling g-C3N4@SiO2-based SPE with high performance liquid chromatography-ultraviolet（HPLC-UV） detection. The linearity of the developed method was in the range of 20--1000 ng/mL and its limit of detection was in the range of 1.9--5.7 ng/mL, which were signi- ficantly lower than those of the reported similar methods. The intra-day and inter-day precisions（based on the relative standard deviation, n=3） of the four aromatic acids were under 9.5% and 10.4%, respectively. The developed method was applied to determining the four aromatic acids in real CW samples and the spiked recoveries varied from 81.1% to 121.8%.

关键词： Aromatic acid Coconut water Solid-phase extraction Graphitic carbon nitride High-performance liquidchromatography

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