Department of Chemistry, University of Torino , Via P. Giuria 5, 10125 Torino, Italy.
J Agric Food Chem. 2014 Jun 4;62(22):5220-5. doi: 10.1021/jf5010995. Epub 2014 May 21.
An extraction method based on molecularly imprinted polymer prepared through a mimic template approach was used for the determination of ochratoxin A in 17 red wines from different geographical regions of Italy. Sample loading (wine sample diluted 1:1 with 1% v/v aqueous solution of PEG 8000), washing (2 mL water/acetonitrile 4:1 v/v), and elution (2 mL of acetonitrile/acetic acid 98:2 v/v) conditions allowed the optimization of the extraction method, capable of preconcentrating ochratoxin A below the maximum permitted level of 2 ng/mL. Under optimized conditions, recoveries of ochratoxin A from spiked samples ranged from 88 to 102% with sample volumes up to 20 mL. The HPLC determination by fluorescence detection allowed limits of detection and quantification, respectively, of 0.075 and 0.225 ng/mL. Sample extractions by an immunoaffinity protocol showed the method to be comparable, demonstrating the potential of the imprinting approach to substitute for the current immunoaffinity method.
基于模拟模板法制备的分子印迹聚合物的提取方法用于测定来自意大利不同地理区域的 17 种红葡萄酒中的赭曲霉毒素 A。样品加载(将葡萄酒样品用 1% v/v 的聚乙二醇 8000 水溶液稀释 1:1)、洗涤(2 mL 水/乙腈 4:1 v/v)和洗脱(2 mL 乙腈/乙酸 98:2 v/v)条件允许优化提取方法,能够在 2 ng/mL 的最大允许水平以下预浓缩赭曲霉毒素 A。在优化条件下,从加标样品中回收的赭曲霉毒素 A 回收率为 88%至 102%,样品体积可达 20 mL。通过荧光检测的 HPLC 测定允许检测限和定量限分别为 0.075 和 0.225 ng/mL。通过免疫亲和法进行样品提取表明该方法具有可比性,证明印迹方法有潜力替代当前的免疫亲和方法。