Development of an immunochromatographic lateral flow test strip for detection of beta-adrenergic agonist Clenbuterol residues.
A rapid immunochromatographic lateral flow test strip was developed in a competitive format with the gold-conjugated monoclonal antibody to specifically determine the residues of Clenbuterol (CL), a beta-adrenergic agonist. The test strip is made up of a sample pad, a conjugate reagent pad, a test membrane containing a control line and a test line, and an absorbent pad. CL standard samples of 0, 0.1, 0.3, 0.9, 2.7, 8.1 ng/ml in swine urine were determined by the test strip. It was shown that detection limit of the test strip was as low as 0.1 ng/ml of CL and that the half of maximal inhibition concentration (IC50) in relative optical density was calculated to be 1.78+/-0.17 ng/ml under an optical density scanner. The sensitivity by eye measurement was 1.0 ng/ml. It takes 10 min to accomplish a test. Parallel analysis of urine samples from pigs fed with CL showed comparable results obtained from the test strip and GC-MS. Therefore, the test strip is very useful as a screening method for quantitative, semi-quantitative or qualitative detection of CL residues in swine urine.
Zhang
G P
GP
College of Animal and Veterinary Sciences, Henan Institute of Science and Technology, Xinxiang 453003, PR China. zhanggaiping2003@yahoo.com.cn
Wang
X N
XN
Yang
J F
JF
Yang
Y Y
YY
Xing
G X
GX
Li
Q M
QM
Zhao
D
D
Chai
S J
SJ
Guo
J Q
JQ