Multiplexed immunochromatographic test strip for time-resolved chemiluminescent detection of pesticide residues using a bifunctional antibody.
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 2.5s and 300s, respectively. The linear ranges for methyl parathion and imidacloprid were both 0.1-250ngmL-1, with detection limits of 0.058ngmL-1(S/N=3). The whole assay process could be accomplished within 22min. 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.
Key Laboratory of Luminescence and Real-Time Analytical Chemistry (Ministry of Education), College of Pharmaceutical Sciences, Southwest University, Chongqing 400716, China.
Qi
Q
Shu
College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China.
Limin
L
Wang
Key Laboratory of Luminescence and Real-Time Analytical Chemistry (Ministry of Education), College of Pharmaceutical Sciences, Southwest University, Chongqing 400716, China.
Hui
H
Ouyang
Key Laboratory of Luminescence and Real-Time Analytical Chemistry (Ministry of Education), College of Pharmaceutical Sciences, Southwest University, Chongqing 400716, China.
Wenwen
W
Wang
College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China; Institute of Plant Protection, Jiangsu Academy of Agricultural Science, Nanjing 210014, China. Electronic address: fqliu20011@sina.com.
Fengquan
F
Liu
Key Laboratory of Luminescence and Real-Time Analytical Chemistry (Ministry of Education), College of Pharmaceutical Sciences, Southwest University, Chongqing 400716, China. Electronic address: fuzf@swu.edu.cn.
Zhifeng
Z
Fu
D018033:Antibodies, Bispecific / Q000737:chemistry*; D015374:Biosensing Techniques / Q000295:instrumentation; D002846:Chromatography, Affinity / Q000295:instrumentation*; D004340:Drug Contamination; D004365:Drugs, Chinese Herbal / Q000737:chemistry*; D004867:Equipment Design; D007093:Imidazoles / Q000032:analysis*; D057230:Limit of Detection; D049449:Luminescence; D008163:Luminescent Measurements / Q000295:instrumentation*; D000073943:Neonicotinoids; D009574:Nitro Compounds / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis*; D011934:Reagent Strips / Q000032:analysis
D018033:Antibodies, Bispecific; D004365:Drugs, Chinese Herbal; D007093:Imidazoles; D000073943:Neonicotinoids; D009574:Nitro Compounds; D010573:Pesticide Residues; D011934:Reagent Strips; C082359:imidacloprid
Bifunctional antibody; Imidacloprid; Immunochromatographic test strip; Methyl parathion; Multiplexed immunoassay; Time-resolved chemiluminescence