School of Chemical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia.
Talanta. 2012 Jan 15;88:129-35. doi: 10.1016/j.talanta.2011.10.021. Epub 2011 Oct 31.
A simple, environmental friendly and selective sample preparation technique employing porous membrane protected micro-solid phase extraction (μ-SPE) loaded with molecularly imprinted polymer (MIP) for the determination of ochratoxin A (OTA) is described. After the extraction, the analyte was desorbed using ultrasonication and was analyzed using high performance liquid chromatography. Under the optimized conditions, the detection limits of OTA for coffee, grape juice and urine were 0.06 ng g(-1), 0.02 and 0.02 ng mL(-1), respectively while the quantification limits were 0.19 ng g(-1), 0.06 and 0.08 ng mL(-1), respectively. The recoveries of OTA from coffee spiked at 1, 25 and 50 ng g(-1), grape juice and urine samples at 1, 25 and 50 ng mL(-1) ranged from 90.6 to 101.5%. The proposed method was applied to thirty-eight samples of coffee, grape juice and urine and the presence of OTA was found in eighteen samples. The levels found, however, were all below the legal limits.
描述了一种简单、环保且选择性的样品制备技术,采用多孔膜保护的微固相萃取(μ-SPE),其中装载有分子印迹聚合物(MIP),用于测定赭曲霉毒素 A(OTA)。萃取后,使用超声波解吸分析物,并使用高效液相色谱法进行分析。在优化条件下,OTA 在咖啡、葡萄汁和尿液中的检测限分别为 0.06ng g(-1)、0.02 和 0.02ng mL(-1),定量限分别为 0.19ng g(-1)、0.06 和 0.08ng mL(-1)。OTA 在浓度为 1、25 和 50ng g(-1)的咖啡、1、25 和 50ng mL(-1)的葡萄汁和尿液样品中的回收率范围为 90.6%至 101.5%。该方法应用于 38 份咖啡、葡萄汁和尿液样品,发现 18 份样品中存在 OTA,但含量均低于法定限量。