It was found that during controlled autolysis of sedimentary wine yeasts following fermentation of apple and black-currant musts, the polyphenols adsorbed on yeast cells are desorbed . 6-8% of total polyphenols in the must were retained by the yeasts, and of this amount 13.4-18.2% passed on to the autolysate. The polyphenols in the aulolysate were catechin monomers and polymers; no phenolic acids were found to accompany them.
A method of the stabilisation of apple wines containing gelatinized starch and dextrin has been developed. The method depends on the hydrolysis of these ingredients with amylolytic enzymes contained in "Pektopol P" at the storage cellar temperature of approximately 15°C for one week, followed by the inactivation of introduced enzymes by short pasteurisation at 87-90°C.
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