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Rapid detection of cow milk adulteration/contamination in goat milk by a lateral flow colloidal gold immunoassay strip

Bochao Liu, Jinhong Si, Fang Zhao, Qi Wang, Yu Wang, Jinfeng Li, Chengyao Li, Tingting Li
Journal of Dairy Research 2019 February 7, : 1-4
Current available methods to detect cow milk adulteration or accidental contamination of goat milk are both laborious and time consuming. The aim of this technical research communication was to develop a simple, rapid, specific and sensitive method for quantitative detection of cow milk in goat milk. A competitive lateral flow immunoassay (LFIA) strip was developed using a specific monoclonal antibody (mAb) labeled with colloidal gold nanoparticles (GNPs) for specifically binding to cow milk casein. The detection limit of this rapid detection was 0.07% of cow milk in goat milk, providing equal specificity and higher sensitivity when compared with a commercial enzyme-linked immunosorbent assay (ELISA). These result suggest that the established rapid GNPs-LFIA strip could be used for monitoring cow milk adulteration/contamination of goat milk.


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