Patent ID: 8652809

Claim:
A method of producing ultra-heat treatment (UHT) milk comprising: mixing a lipid acyltransferase with milk, or a milk fraction, and heating mixture with an ultra-heat treatment to thereby produce UHT milk, wherein the lipid acyltransferase has at least 5% transferase activity when calculated with an assay for transferase activity, wherein the assay comprises measuring a molar amount of cholesterol ester formed by acyltransfer from phospholipids or triacylglycerides in milk to cholesterol relative to the amount of cholesterol originally available with a formula: Transferase activity=(Mol/l cholesterol ester( t )−Mol/l cholesterol ester(0))×100 Mol/l cholesterol(0); and wherein cholesterol ester(t)=the amount of cholesterol ester to the time t, Cholesterol ester(0)=the amount of cholesterol ester to the time 0, Cholesterol (0)=the amount of cholesterol in milk to the time 0 and Cholesterol and cholesterol ester are determined by gas liquid chromatography (GLC).