Study on growth and malolactic fermentation characteristics of Oenococcus oeni in plum juice

Plum juice was used as material and Oenococcus oeni was used as strain for malolactic fermentation (MLF) to reduce acids in juice. The results were as follows:when the inoculation amount was 2.0×108CFU/mL, the pH was equal or greater than 3.4, the MLF proceeded normally and the acidity of plum juice was reduced by more than 61.35%. When the inoculation amount was 2.6 ×107CFU/mL and the pH was 3.6, the MLF could perform and the acidity of plum juice was reduced by 77.60%. When the inoculation amount was 2.3×108CFU/mL and the pH were 3.6 and 4.0, compared with the sample without adding glucose, the acidity of plum juice reduced by 27.04% and 34.63% respectively with 1.0g/100g glucose. In sodium citrates buffer system, the acidity reduced by 26.40%, it was proved that Oenococcus oeni could use citric acid as carbon resource to run of MLF.