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Development and Validation of a Novel Lateral Flow Immunoassay (LFIA) for the Rapid Screening of Paralytic Shellfish Toxins (PSTs) from Shellfish Extracts
Analytical Chemistry ( IF 6.7 ) Pub Date : 2015-05-06 00:00:00 , DOI: 10.1021/acs.analchem.5b00608
Waqass Jawaid 1, 2 , Katrina Campbell 2 , Karrie Melville 1 , Stephen J. Holmes 1 , Jennifer Rice 3 , Christopher T. Elliott 2
Affiliation  

A single-step lateral flow immunoassay (LFIA) was developed and validated for the rapid screening of paralytic shellfish toxins (PSTs) from a variety of shellfish species, at concentrations relevant to regulatory limits of 800 μg STX-diHCl equivalents/kg shellfish meat. A simple aqueous extraction protocol was performed within several minutes from sample homogenate. The qualitative result was generated after a 5 min run time using a portable reader which removed subjectivity from data interpretation. The test was designed to generate noncompliant results with samples containing approximately 800 μg of STX-diHCl/kg. The cross-reactivities in relation to STX, expressed as mean ± SD, were as follows: NEO: 128.9% ± 29%; GTX1&4: 5.7% ± 1.5%; GTX2&3: 23.4% ± 10.4%; dcSTX: 55.6% ± 10.9%; dcNEO: 28.0% ± 8.9%; dcGTX2&3: 8.3% ± 2.7%; C1&C2: 3.1% ± 1.2%; GTX5: 23.3% ± 14.4% (n = 5 LFIA lots). There were no indications of matrix effects from the different samples evaluated (mussels, scallops, oysters, clams, cockles) nor interference from other shellfish toxins (domoic acid, okadaic acid group). Naturally contaminated sample evaluations showed no false negative results were generated from a variety of different samples and profiles (n = 23), in comparison to reference methods (MBA method 959.08, LC-FD method 2005.06). External laboratory evaluations of naturally contaminated samples (n = 39) indicated good correlation with reference methods (MBA, LC-FD). This is the first LFIA which has been shown, through rigorous validation, to have the ability to detect most major PSTs in a reliable manner and will be a huge benefit to both industry and regulators, who need to perform rapid and reliable testing to ensure shellfish are safe to eat.

中文翻译:

新型侧向流免疫分析法(LFIA)的开发和验证,用于从贝类提取物中快速筛选麻痹性贝类毒素(PST)

开发了一种单步侧向免疫分析(LFIA),并已进行了验证,可用于快速筛查各种贝类中的麻痹性贝类毒素(PST),其浓度与800μgSTX-diHCl当量/ kg贝类肉的监管限量有关。从样品匀浆开始,在几分钟内执行了简单的水相提取方案。定性结果是在5分钟的运行时间后使用便携式读取器生成的,该读取器消除了数据解释的主观性。该测试被设计为对包含约800μgSTX-diHCl / kg的样品产生不合格的结果。与STX有关的交叉反应性表示为平均值±SD,如下:NEO:128.9%±29%; NEO:128.9%±29%。GTX1&4:5.7%±1.5%; GTX2&3:23.4%±10.4%;dcSTX:55.6%±10.9%;dcNEO:28.0%±8.9%;dcGTX2&3:8.3%±2.7%;C1&C2:3.1%±1.2%; GTX5:23.3%±14.4%(n = 5个LFIA批次)。没有迹象表明所评估的不同样品(贻贝,扇贝,牡蛎,蛤,蛤)对基质的影响,也没有其他贝类毒素(杜摩酸,冈田酸组)的干扰。与参考方法(MBA方法959.08,LC-FD方法2005.06)相比,受自然污染的样品评估显示,从各种不同的样品和配置文件中均未产生假阴性结果(n = 23)。外部实验室对自然污染样品的评估(n= 39)表明与参考方法(MBA,LC-FD)具有良好的相关性。这是通过严格验证显示的第一个LFIA,它具有以可靠的方式检测大多数主要PST的能力,并且对需要快速,可靠地进行测试以确保贝类的行业和监管机构都将受益匪浅可以安全食用。
更新日期:2015-05-06
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