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Changes that occur in milk proteins during heat treatment were studied. Milk was heat treated at 87°C for 10 min. Samples of untreated milk, demineralised whey powder and heat treated milk were analysed by discontinuous PAGE and by densitometric analysis of destained gels. PAGE experiments showed that heat treatment induces changes on milk proteins. During heating at 87°C for 10 min all amount of β-lactoglobulin present in milk interacted with casein, while small amount of α-lactalbumin did not interact with casein. It could be hypothesised that heating of milk at 87°C for 10 min influences complete denaturation of β-lactoglobulin and formation of complex with casein, while α-lactalbumin denatures and interacts with β-lactoglobulin when β-lactoglobulin has already linked with casein micelles. © 2005 Akadémiai Kiadó.