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采用固相微萃取结合液相色谱-荧光检测法测定葡萄酒中亚纳克/毫升水平的赭曲霉毒素A。

Determination of Ochratoxin A in wine at sub ng/mL levels by solid-phase microextraction coupled to liquid chromatography with fluorescence detection.

作者信息

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

机构信息

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

出版信息

J Chromatogr A. 2006 May 19;1115(1-2):196-201. doi: 10.1016/j.chroma.2006.02.092. Epub 2006 Mar 22.

Abstract

Solid-phase microextraction (SPME), using a polydimethylsiloxane/divinylbenzene (PDMS/DVB) fiber, interfaced with liquid chromatography-fluorescence detection (LC-FD) has been applied to the determination of Ochratoxin A (OTA) in wine samples. Compared to the most widely adopted extraction/clean-up procedure based on immunoaffinity columns (IAC), the solventless extraction is simpler and cost-effective, requiring the simple immersion of the fiber in diluted wine samples. Furthermore, a fast LC separation is achieved under isocratic conditions. The linear range investigated in wine was 0.25-8 ng/mL; at fortification levels of 0.5 and 2 ng/mL, within-day intra-laboratory precision (repeatability) values, expressed as RSD%, were 5.9 and 5.1, respectively, whereas between days (n = 4) precision was 8.5 and 7.1%, respectively. The limit of detection (LOD) at a signal-to-noise (S/N) ratio of 3 was 0.07 ng/mL; the limit of quantification (LOQ) calculated at S/N = 10 was 0.22 ng/mL, well below the European regulatory level of 2 ng/mL. The potential of the method has been demonstrated by the analysis of a number of different wine samples.

摘要

采用聚二甲基硅氧烷/二乙烯基苯(PDMS/DVB)纤维的固相微萃取(SPME)与液相色谱-荧光检测(LC-FD)联用,已用于葡萄酒样品中赭曲霉毒素A(OTA)的测定。与基于免疫亲和柱(IAC)的最广泛采用的萃取/净化程序相比,这种无溶剂萃取更简单且具有成本效益,只需将纤维简单浸入稀释的葡萄酒样品中即可。此外,在等度条件下可实现快速的液相色谱分离。在葡萄酒中研究的线性范围为0.25 - 8 ng/mL;在0.5和2 ng/mL的加标水平下,日内实验室内部精密度(重复性)值以相对标准偏差(RSD%)表示,分别为5.9和5.1,而日间(n = 4)精密度分别为8.5和7.1%。在信噪比(S/N)为3时的检测限(LOD)为0.07 ng/mL;在S/N = 10时计算的定量限(LOQ)为0.22 ng/mL,远低于欧洲2 ng/mL的监管水平。通过对多个不同葡萄酒样品的分析证明了该方法的潜力。

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