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Wine production using yeast immobilized on apple pieces at low and room temperatures

Wine production using yeast immobilized on apple pieces at low and room temperatures

Journal of agricultural and food chemistry 49(3): 1417-1425

ISSN/ISBN: 0021-8561

PMID: 11312874

DOI: 10.1021/jf000942n

A biocatalyst was prepared by immobilization of Saccharomyces cerevisiae strain AXAZ-1 on apple pieces. It was examined by electron microscope and studied during the fermentation of grape must for batch wine-making. The immobilized yeast showed an important operational stability without any decrease of its activity even at low temperatures (1-12 degrees C). Specifically, at 6 degrees C the biocatalyst favored wine production within 8 days, which is less time than is required for the natural fermentation of grape must. At 1 degrees C wine production was effected in 1 month. This speeding up of the fermentation could be accepted and adopted by the industry for scaling up the wine-making process. Total and volatile acidities were similar to those found in dry wines. The concentrations of higher alcohols (propanol-1 and isobutyl alcohol) were low. The presence of amyl alcohols proved to be temperature dependent and decreased with the temperature decrease. The values of ethyl acetate concentrations were relatively high, up to 154 mg/L. This probably contributes to the fruity aroma and excellent taste of the produced wines. There was no indication of vinegar odor in the product given that the volatile acidity was <0.47 g of acetic acid/L. From the GC-MS analysis it was concluded that cell immobilization did not create serious changes in the product (wine) with regard to the qualitative composition of the aroma compounds.

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Accession: 011654360

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