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Isolation and selection of yeasts from soursop Annona muricata for wine fermentation

Wine is a healthy drink and is becoming more diverse thanks to the substances with high biological activity and fully preserved the antioxidant capacity in the fruit after fermentation by yeast. This study aims to isolate yeasts that are capable of soursop fermentation. There were eight yeast strains isolated, in which five strains of yeasts NM1.1, NM1.2, NM2.1, NM3.1, NM3.2 are capable of fermenting soursop wine. Wine product after fermentation using strain NM1.1 with initial conditions of 22ºBrix, pH 4.5, supplemented yeast 1% (w/v) at room temperature (28-30ºC), in twelve-day, produced the ethanol content 10% v/v, methanol 1.304 g/l, and SO2 10.9 mg/l that meet Vietnamese standards (QCVN 6-3:2010/BYT).