Abstract: This study was aimed to prepare excellent fluorescence immunochromatographic strip for clenbuterol (CLB) which could achieve the purpose of rapid and quantitative detection and laid a foundation for its industrialization.The strip was prepared through single factor experiments using latex particles as a fluorescent label.The preparation process was optimized with CLB concentration,drying time,mixing reaction time,reaction temperature and chromatography time.And the properties of this strip including detection limit,specificity,clinical accuracy and added recovery,degree of precision and stability were investigated.Optimum modification conditions were shown as following:CLB concentration was 2.0 mg/mL,drying time was 5 d,mixing reaction time was 1 min,reaction temperature was 25 ℃,chromatography time was 15 min.The detection limit was up to 0.35 μg/L and the cross rate between CLB and other eight similar drugs were less than 0.8% which demonstrated the good specificity.The added recoveries of each batch were between 80% and 120% which met the requirements.The coefficient of variation (CV) under different concentrations of CLB was less than 5% which met the precision standard.Besides,the stability of the experiment also showed that the test strip had good stability.

Key words: clenbuterol; fluorescent immunochromatography; strip; rapid detection