Study On Performance Trait Of Oenococcus Oeni SD-2a Active Dry Powder

Malolactic fermentation(MLF) is indispensable processing technology for modern wine making. In developed wine making countries, most of the vineries use commercial freeze-dried LAB to inoculate MLF. So far, foreign countries like France,The US and Australia have done deeply research on MLF and active dry poeders. But in our country, research on this is scarcely. So, this paper studied on quality test of freeze-drying Oenococcus oeni SD-2a active dry powder. Effects of performance trait in and after malolactic fermentation (MLF) on dry red wine were also studied with Oenococcus oeni SD-2a active dry powdr, 450PreAc dry powder and OENOS dry powder. The results indicated:1. The quality of the Oenococcus oeni SD-2a dry powder was measured. The results showed that the quality of sensory analysis, technical index and hygiene index all measured up, and also met the international standard of similar products.2. The content of total acid, volatile acid and pH changed significantly after MLF. Reduction rates of total acid were 18.6%(SD-2a), 16.4%(450PreAc), 11.7% (OENOS) and 2.9% (CK), respectively. The content of volatile acid are on the rise,Increase values are 0.39 g/L(SD-2a),0.25g/L(OENOS)和0.23 g/L(450PreAc) and 0.08 g/L (CK),bue all the values are under the international standard.3. The content of total phenols are on the rise,Increase values are 0.45 g/L (SD-2a),0.33 g/L (OENOS)和0.23 g/L(450PreAc) and 0.04g/L (CK).4. After MLF wine taste soft , coordination, wine quality is improved, SD-2a and 450PreAc are better, followed by OENOS and CK.5. Oenococcus oeni SD-2a dry powder has a significant drop of total acid content under the conditions of production after MLF, increases the stability of micro-organisms. At the same time, enhances the contents of the total phenols, which is conducive to the formation of complex flavor. At the same time economic interests is considered, the cost per kg of dry powder is 4000-5000 yuan lower thanforeign dry powders, which is beneficiala for wineries cut costs. This test shows that Oenococcus oeni SD-2a dry powder has an excellent performance trait and is suitable for application in production.