The aim of this work was to develop an assay capable of detecting adulteration of soft goat, sheep and buffalo milk cheese with bovine milk from cheaper sources. A previously developed indirect competitive ELISA had a lower sensitivity when applied to cheese, compared with milk. A sandwich ELISA was developed utilising the same monoclonal antibody in combination with a polyclonal goat anti-bovine IgG antibody. Once optimised, the ELISA was found to be highly specific. Detection limits in milk were 0.001% cows’ milk adulteration of sheep or buffalo milk, and 0.01% cows’ milk adulteration of goat milk. Detection limits in soft cheese were 0.001% in goat cheese and 0.01% in sheep or buffalo cheese. The assay was highly reproducible with both intra- and inter-assay coefficient of variation <10%. The ELISA performance makes it suitable for development as a kit for use in routine surveillance of milk and soft cheese.
International Dairy Journal – Elsevier
Published: Jul 1, 2006
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