Multiplexed immunochromatographic test strip for time-resolved chemiluminescent detection of pesticide residues using a bifunctional antibody
文献类型: 外文期刊
第一作者: Shu, Qi
作者: Shu, Qi;Ouyang, Hui;Wang, Wenwen;Fu, Zhifeng;Wang, Limin;Liu, Fengquan;Liu, Fengquan
作者机构:
关键词: Methyl parathion;Imidacloprid;Bifunctional antibody;Time-resolved chemiluminescence;Immunochromatographic test strip;Multiplexed immunoassay
期刊名称:BIOSENSORS & BIOELECTRONICS ( 影响因子:10.618; 五年影响因子:9.323 )
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收录情况: SCI
摘要: A novel bifunctional antibody (BfAb) that could recognize methyl parathion and imidacloprid simultaneously was prepared by a hybrid hybridomas technique. Using the BfAb as the sole recognition reagent, a multiplexed immunochromatographic test strip based on a time-resolved chemiluminescence (CL) strategy was developed for quantitative detection of pesticide residues. Horseradish peroxidase (HRP) and alkaline phosphatase (ALP) were used as the CL probes to label the haptens of methyl parathion and imidacloprid, respectively. After the labeled haptens competed with methyl parathion and imidacloprid to bind with the BfAb immobilized on the test strip, the two CL reactions catalyzed by the enzymes were triggered simultaneously by coreactants injection. Due to the distinct CL kinetics characteristics of HRP and ALP, the signals for methyl parathion and imidacloprid detections were collected at 2.5 s and 300 s, respectively. The linear ranges for methyl parathion and imidacloprid were both 0.1-250 ng mL(-1), with detection limits of 0.058 ng mL(-1) (S/N=3). The whole assay process could be accomplished within 22 min. The detection results for spiked traditional Chinese medicine samples demonstrated its application potential. The proposed method provided a low-cost, facile and rapid tool for multiplexed screening of pesticide residues using single antibody.
分类号: Q
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