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采用固相微萃取和荧光检测液相色谱法测定生咖啡豆中的赭曲霉毒素A。

Determination of ochratoxin A in green coffee beans by solid-phase microextraction and liquid chromatography with fluorescence detection.

作者信息

Vatinno Rosa, Aresta Antonella, Zambonin Carlo G, Palmisano Francesco

机构信息

Dipartimento di Chimica, Università degli Studi di Bari, Via E. Orabona, 4, I-70126 Bari, Italy.

出版信息

J Chromatogr A. 2008 Apr 11;1187(1-2):145-50. doi: 10.1016/j.chroma.2008.02.020. Epub 2008 Feb 12.

Abstract

A new method for the determination of Ochratoxin A (OTA) in green coffee beans by solid-phase microextraction (SPME) coupled to liquid chromatography with fluorescence detection (LC-FD) is described for the first time. Coffee samples were extracted by a 5% NaHCO(3) solution, followed by a clean-up step of the extract by chloroform partition. The aqueous extract was then acidified and finally subjected to SPME-LC-FD analysis. The investigated linear range in coffee was 2-32 ng/g. Within-day RSD% in coffee spiked at 2 and 32 ng/g levels were 3.3 and 2.7, respectively, whereas the between-days RSD% were 4.1 and 3.8, respectively. The limits of detection (LOD) and quantitation (LOQ), calculated at a signal-to-noise ratio of 3 and 10 (noise calculated peak to peak on a blank chromatogram at the OTA retention time), were 0.3 and 2 ng/g, respectively.

摘要

首次描述了一种通过固相微萃取(SPME)结合液相色谱荧光检测(LC-FD)测定生咖啡豆中赭曲霉毒素A(OTA)的新方法。咖啡样品用5%的NaHCO₃溶液萃取,然后通过氯仿分配对萃取物进行净化步骤。接着将水相萃取物酸化,最后进行SPME-LC-FD分析。在咖啡中研究的线性范围为2 - 32 ng/g。在添加水平为2和32 ng/g的咖啡中,日内相对标准偏差(RSD%)分别为3.3和2.7,而日间RSD%分别为4.1和3.8。在OTA保留时间处,以空白色谱图上峰峰噪声比为3和10计算的检测限(LOD)和定量限(LOQ)分别为0.3和2 ng/g。

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