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Multitoxin immunoaffinity analysis of aflatoxins and ochratoxin A in spices
Journal of Food Safety ( IF 1.9 ) Pub Date : 2021-08-09 , DOI: 10.1111/jfs.12921
Maria Helena Iha 1 , Matheus Leandro Rodrigues 1 , Mary Wat Trucksess 2
Affiliation  

A multitoxin method for aflatoxins (AFs) and ochratoxin A (OTA) was modified and validated to analyze black pepper, colorífico, nutmeg, paprika, and turmeric. The method consisted of acetonitrile, NaHCO3 and methanol extraction solution, multimycotoxin immunoaffinity column purification and isolation, reversed-phase liquid chromatography separation, and fluorescence detection. The limit of detection was <0.1 ng/g for AFs and OTA. Mean recoveries of added AFs ranged from 68 to 88% with relative standard deviation of repeatability (RSDr) values <15%; aflatoxin B1 (AFB1) from 69 to 92% with RSDr <17%; and OTA from 75 to 110% with RSDr <10% at spiked levels ranged from 8 to 40 ng/g for AFs, 4 to 20 ng/g for AFB1, and 4 to 20 ng/g for OTA, respectively. Recoveries of added aflatoxin G2 were approximately 50% at spiked levels ranged from 1 to 5 ng/g. Recoveries of aflatoxin B2 and aflatoxin G1 were >70%. The linearity of the method for AFs ranged from 0.4 to 100 ng/g, for OTA from 0.2 to 40 ng/g with R2 values exceeding 0.99. Results of a single laboratory validation study validated the performance of this method meeting the method acceptability criteria. No differences in toxin detection were determined in robustness testing in which minor changes were introduced to the method.

中文翻译:

香料中黄曲霉毒素和赭曲霉毒素A的多毒素免疫亲和分析

对黄曲霉毒素 (AF) 和赭曲霉毒素 A (OTA) 的多毒素方法进行了修改和验证,以分析黑胡椒、色素、肉豆蔻、辣椒粉和姜黄。该方法由乙腈、NaHCO 3和甲醇提取液、多霉菌毒素免疫亲和柱纯化分离、反相液相色谱分离、荧光检测组成。AF 和 OTA 的检测限<0.1 ng/g。添加的 AF 的平均回收率为 68% 到 88%,重复性的相对标准偏差 (RSDr) 值 <15%;黄曲霉毒素 B 1 (AFB 1 ) 从 69% 到 92%,RSDr <17%;OTA 为 75% 至 110%,RSDr <10%,加标浓度范围为 AF 8 至 40 ng/g,AFB 1为 4 至 20 ng/g和 4 至 20 ng/g(用于 OTA)。在 1 到 5 ng/g 的加标水平下,添加的黄曲霉毒素 G 2 的回收率约为 50%。黄曲霉毒素 B 2和黄曲霉毒素 G 1 的回收率>70%。该方法的 AF 线性范围为 0.4 至 100 ng/g,OTA 为 0.2 至 40 ng/g,R 2值超过 0.99。单个实验室验证研究的结果验证了该方法的性能符合方法可接受性标准。在稳健性测试中没有确定毒素检测的差异,其中对方法进行了细微的更改。
更新日期:2021-10-08
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