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Novel immunochromatographic assay based on Eu (III)-doped polystyrene nanoparticle-linker-monoclonal antibody for sensitive detection of Escherichia coli O157:H7
Analytica Chimica Acta ( IF 5.7 ) Pub Date : 2018-01-01 , DOI: 10.1016/j.aca.2017.10.027
Ke-Yu Xing , Juan Peng , Dao-Feng Liu , Li-Ming Hu , Chun Wang , Guo-Qiang Li , Gang-Gang Zhang , Zhen Huang , Song Cheng , Fang-Fei Zhu , Na-Mei Liu , Wei-Hua Lai

Colloidal gold immunochromatographic assay (ICA) has poor sensitivity when used for Escherichia coli O157:H7 (E. coli O157:H7) detection. Eu (III)-doped polystyrene nanoparticle (EuNP) has a large range of stokes shift, long decay time, and wide excitation spectrum and narrow emission spectra. EuNP has been used as novel probe in ICA to improve sensitivity. In this study, carboxyl-modified EuNPs were prepared with different linkers. ICA based on EuNP, EuNP-6 carbon chain (CC) complex, EuNP-200CC complex, EuNP-1000CC complex, and EuNP-streptavidin (EuNP-SA) complex were systematically compared for the detection of E. coli O157:H7. Under optimized working conditions, the limits of detection (LOD) of EuNP-ICA, EuNP-6CC-ICA, EuNP-200CC-ICA, EuNP-1000CC-ICA, and EuNP-SA-ICA were 9.54 × 102, 1.59 × 102, 3.18 × 102, 2.98 × 102, and 1.08 × 102 colony-forming units (CFU) mL-1, respectively. The linear ranges of EuNP-ICA, EuNP-6CC-ICA, EuNP-200CC-ICA, EuNP-1000CC-ICA, and EuNP-SA-ICA were 6.36 × 102-1.59 × 105, 3.18 × 102-1.59 × 105, 6.36 × 102-1.59 × 105, 6.36 × 102-1.59 × 105, and 8.0 × 101-1.59 × 105 CFU mL-1, respectively. EuNP-SA-ICA exhibited the highest sensitivity and the widest linear range with good specificity, accuracy, and precision. It could be a promising analytical method for detecting E. coli O157:H7 in food samples. EuNP-SA-ICA may be a good model for detecting low concentrations of other food-borne pathogens.

中文翻译:

基于 Eu (III) 掺杂的聚苯乙烯纳米颗粒-接头-单克隆抗体的新型免疫层析法用于灵敏检测大肠杆菌 O157:H7

胶体金免疫色谱法 (ICA) 在用于大肠杆菌 O157:H7(大肠杆菌 O157:H7)检测时灵敏度较差。Eu (III) 掺杂的聚苯乙烯纳米粒子 (EuNP) 具有大范围的斯托克斯位移、长衰减时间、宽激发光谱和窄发射光谱。EuNP 已被用作 ICA 中的新型探针以提高灵敏度。在这项研究中,羧基修饰的 EuNPs 是用不同的接头制备的。系统比较了基于 EuNP、EuNP-6 碳链 (CC) 复合物、EuNP-200CC 复合物、EuNP-1000CC 复合物和 EuNP-链霉亲和素 (EuNP-SA) 复合物的 ICA 对大肠杆菌 O157:H7 的检测。在优化工况下,EuNP-ICA、EuNP-6CC-ICA、EuNP-200CC-ICA、EuNP-1000CC-ICA和EuNP-SA-ICA的检出限(LOD)分别为9.54×102、1.59×102、 3.18 × 102、2.98 × 102 和 1。08 × 102 菌落形成单位 (CFU) mL-1,分别。EuNP-ICA、EuNP-6CC-ICA、EuNP-200CC-ICA、EuNP-1000CC-ICA和EuNP-SA-ICA的线性范围分别为6.36×102-1.59×105、3.18×102-1.59×105、6.3 × 102-1.59 × 105、6.36 × 102-1.59 × 105 和 8.0 × 101-1.59 × 105 CFU mL-1。EuNP-SA-ICA 表现出最高的灵敏度和最宽的线性范围,具有良好的特异性、准确度和精密度。它可能是检测食品样品中大肠杆菌 O157:H7 的一种很有前景的分析方法。EuNP-SA-ICA 可能是检测低浓度其他食源性病原体的良好模型。分别为 59 × 105 CFU mL-1。EuNP-SA-ICA 表现出最高的灵敏度和最宽的线性范围,具有良好的特异性、准确度和精密度。它可能是检测食品样品中大肠杆菌 O157:H7 的一种很有前景的分析方法。EuNP-SA-ICA 可能是检测低浓度其他食源性病原体的良好模型。分别为 59 × 105 CFU mL-1。EuNP-SA-ICA 表现出最高的灵敏度和最宽的线性范围,具有良好的特异性、准确度和精密度。它可能是检测食品样品中大肠杆菌 O157:H7 的一种很有前景的分析方法。EuNP-SA-ICA 可能是检测低浓度其他食源性病原体的良好模型。
更新日期:2018-01-01
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