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首页> 外文期刊>Journal of Food Science >Immunoliposomes sandwich fluorometric assay (ILSF) for detection of Escherichia coli O157 : H7
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Immunoliposomes sandwich fluorometric assay (ILSF) for detection of Escherichia coli O157 : H7

机译:免疫脂质体夹心荧光测定法(ILSF)用于检测大肠杆菌O157:H7

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摘要

We report the development of automated flourometric immunoassay for the detection of Escherichia coli O157:H7, using antibody-directed liposomes (immunoliposomes) encapsulating fluorophore as an analytical reagent. Thiolated antibodies (anti-E. coli O157:H7) were coupled to malemide-tagged liposomes encapsulating dye. To automate the assay, a fluorescence plate reader was included in the assay system to detect fluorophore released from lysed liposomes in a microplate. The detection limit of the current assay with pure cultures of the serotype was about 10(4) colony-forming units (CFU)/mL. The assay can detect E. coli O157 in ground beef samples inoculated with as few as 0.8 CFU/mL after a 12-h enrichment. These results demonstrate the feasibility of using fluorophore-encapsulated immunoliposomes in a microtiter plate for the rapid and automated detection of molecules with multivalent antigenic sites.
机译:我们报告了自动化荧光定量免疫分析法的发展,用于检测大肠埃希氏菌O157:H7,使用包封荧光团的抗体定向脂质体(免疫脂质体)作为分析试剂。将硫酰化的抗体(抗大肠杆菌O157:H7)与封装有马来酰亚胺标签的脂质体偶联。为了使测定自动化,在测定系统中包括了荧光板读数器,以检测微板中从裂解的脂质体释放的荧光团。用纯血清型培养物进行的当前检测方法的检出限约为10(4)个菌落形成单位(CFU)/ mL。该测定法可以在富集12小时后以低至0.8 CFU / mL的浓度对碎牛肉样品中的大肠杆菌O157进行检测。这些结果证明了在微量滴定板中使用荧光团封装的免疫脂质体来快速,自动检测具有多价抗原位点的分子的可行性。

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