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Development of a monoclonal antibody-based immunoassay for specific quantification of bovine milk alkaline phosphatase

Published online by Cambridge University Press:  30 April 2007

Nathalie Geneix ,
Eric Dufour ,
Annie Venien  and
Didier Levieux
Nathalie Geneix
Affiliation:
INRA, QuaPA-Immunochimie, Theix, 63122 Saint-Genès-Champanelle, France
Eric Dufour
Affiliation:
ENITAC, Département Qualité et Economie Alimentaires, BP 35, Marmilhat, 63370 Lempdes, France
Annie Venien
Affiliation:
INRA, QuaPA-Immunochimie, Theix, 63122 Saint-Genès-Champanelle, France
Didier Levieux*
Affiliation:
INRA, QuaPA-Immunochimie, Theix, 63122 Saint-Genès-Champanelle, France
*
*For correspondence; e-mail: didier.levieux@clermont.inra.fr
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Abstract

The detection of alkaline phosphatase (ALP) activity is used as a legal test to determine whether milk has been adequately pasteurized or recontaminated with raw milk. However, a wide variety of microorganisms produce both heat labile and heat stable ALPs which cannot be differentiated from the milk ALP by current enzymatic methods. Monoclonal antibodies specific of the bovine milk ALP were obtained in mice from a raw bovine milk ALP preparation. Coated in microtitre plates, these antibodies specifically capture the bovine milk ALP from dairy products. After washing, the enzymatic activity of the captured ALP is revealed by adding p-nitrophenyl-phosphate as a substrate. This simple immunoassay does not react with ALPs of intestinal or bacterial origin and, once optimized, was found to be the first immunoassay suitable to detect raw milk in boiled milk down to a 0·02% dilution. Moreover, in contrast with competitive indirect ELISA formats, the capture immunoassay does not require purified ALP.

Keywords

Alkaline phosphatasemilkbovineimmunoassaymonoclonal antibodies
Type
Research Article
Information
Journal of Dairy Research , Volume 74 , Issue 3 , August 2007 , pp. 290 - 295
Copyright
Copyright © Proprietors of Journal of Dairy Research 2007

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