Process for Preparation of Packaged Heat-Preserved Aqueous Drink Comprising Casein Micelles and Tryptophan-Rich Peptides, and Products so obtained

A process for preparing a packaged, aqueous liquid composition comprising 0.5-4%, based on dry weight, on total liquid composition, of casein micelles and 0.1-5% based on dry weight, on total liquid composition, of tryptophan-containing peptide composition having a level of tryptophan of 1-10% by weight, on the tryptophan-containing peptides, which process involves the steps of:

• obtaining mixture comprising water, in an amount of 50-97% by weight based on the total composition, 0.5-4% based on dry weight casein micelles, and 0.1-5% based on dry weight tryptophan-containing peptide composition having a level of tryptophan of 1-10% by weight, on the tryptophan-containing peptides,
• subjecting said mixture to a heat preservation treatment at a temperature of 120-150° C.,
• packaging the so-obtained liquid product by aseptic packaging, wherein the mixture subjected to a heat preservation treatment has a pH of below 8.1 and above the pH given by the relationship, in which formula casein micelles is expressed as weight % on total formulation:
• pH>0.02*T(° C.)+0.23*(casein micelles in dry weight %)+3.8.