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A variety of protein assays were applied to the analysis of 25 commercial samples of Lebanese Kishk to detect the adulteration of goat's milk with cow's milk.Polyacrylamide gel electrophoretic (PAGE) methods could detect the degree of adulteration -25 %.Using sodium dodecyl sulphate (SOS-PAGE), reverse phase high performance Iiquid chromatography (RP-HPLC) and anion-exchange fast protein liquid chromatography (FPLC) failed to detect the degree of adulteration in Kishk due to a very extensive proteolysis that made the distinction of the original caseins very difficult.Moreover, the immunoassay technique (Cortecs method) had Iimited application for powder products and cou Id not be used effectively to calculate the degree of adulteration of goat's milk Kishk with cow's milk.© InralElsevier, Paris. Kishk / PAGE / SDS-PAGE / RP-HPLC / immunoassayRésumé -Le Kishk -un mélange lait/céréales fermenté et séché.2. Test de différentes techniques d'analyse des protéines pour déterminer l'adultération du lait et la protéolyse.Différentes méthodes de détermination des protéines ont été testées pour l'analyse de 25 échantillons de Kishk libanais du commerce pour détecter l'adultération du lait de chèvre par du lait de vache.Les méthodes par électrophorèse en gel de polyacrylamide (PAGE) permettent la détection d'un degré d'adultération d'environ 25 %.
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Tamime et al. (1999) studied this question.
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