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首页> 外文期刊>Journal of Agricultural and Food Chemistry >A Novel Synchronous Fluorescence Spectroscopic Approach for the Rapid Determination of Three Polycyclic Aromatic Hydrocarbons in Tea with Simple Microwave-Assisted Pretreatment of Sample
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A Novel Synchronous Fluorescence Spectroscopic Approach for the Rapid Determination of Three Polycyclic Aromatic Hydrocarbons in Tea with Simple Microwave-Assisted Pretreatment of Sample

机译：微波辅助预处理快速测定茶叶中三种多环芳烃的新型同步荧光光谱法

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摘要

Many polycyclic aromatic hydrocarbons (PAHs) are carcinogenic, and some have been reported to be present in tea. People can be exposed to PAHs through tea consumption. Therefore, there is real importance for the determination of PAHs in tea. Because of the complex matrix of tea, it is hard to detect PAHs in tea without cleanup and chromatographic separation procedures. In this research, for the first time, a novel synchronous fluorescence spectroscopic approach coupling nonlinear variable-angle synchronous and matrix-isopotential synchronous scanning modes has been developed for the rapid determination of benzo(a)pyrene (BaP), benzo(k)fluoranthene (BkF), and anthracene (AN) in tea with simple microwave-assisted pretreatment of samples. This novel technique is able to resolve the spectra of the three PAHs well, even with interference from other EPA PAHs. The detection limits for BaP, BkF, and AN in tea were 0.18-0.28, 0.S5-0.89, and 0.64-3.58 μg/kg, respectively, depending on various teas, with satisfactory recoveries ranging from 77.1 to 116%. The relative standard deviations achieved for BaP, BkF, and AN were 1.5,6.6, and 8.5% for green tea; 2.9,7.4, and 2.1% for oolong tea; and 5.6,5.4, and 5.8% for black tea, respectively. Our results showed good correlation with those of gas chromatography-mass spectrometry. The approach developed is simple, reliable, and cost-efficient, providing an attractive alternative for the rapid selective screening of PAHs in tea.
机译：许多多环芳烃（PAHs）具有致癌性，据报道其中一些存在于茶中。人们可以通过喝茶来接触多环芳烃。因此，测定茶叶中的PAHs具有真正的重要性。由于茶叶基质复杂，如果不进行净化和色谱分离程序就很难检测茶叶中的PAHs。在这项研究中，首次开发了一种新颖的同步荧光光谱方法，该方法结合了非线性可变角同步和矩阵等电位同步扫描模式，用于快速测定苯并（a）py（BaP），苯并（k）荧蒽。茶叶中的六溴环十二烷（BkF）和蒽（AN）进行简单的微波辅助样品预处理。即使受到其他EPA PAH的干扰，这项新技术也能够很好地解析三个PAH的光谱。茶叶中BaP，BkF和AN的检出限分别为0.18-0.28、0.S5-0.89和0.64-3.58μg/ kg，具体取决于各种茶，其回收率在77.1％至116％之间。绿茶的BaP，BkF和AN的相对标准偏差分别为1.5、6.6和8.5％。乌龙茶为2.9、7.4和2.1％;红茶分别为5.6、5.4和5.8％。我们的结果与气相色谱-质谱法显示出良好的相关性。开发的方法简单，可靠且具有成本效益，为快速选择性筛选茶叶中的PAHs提供了有吸引力的替代方法。

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