本土戴尔有孢圆酵母在葡萄酒酿造中的应用潜力

对从甘肃祁连产区筛选获得的3株戴尔有孢圆酵母(Torulaspora delbrueckii)的生理特性及发酵性能进行分析,并选用T.delbrueckii R12与酿酒酵母以不同接种方式和接种比例混合酿造赤霞珠干红葡萄酒。结果表明:3株菌均具有良好的抗逆性,可耐受体积分数12%乙醇、400 mg/L SO2和400 g/L糖;在含200 g/L糖的模拟汁中单独接种,3株菌均能完成发酵,乙醇产量(体积分数)达11%,当糖质量浓度不小于300 g/L时,3株菌能启动发酵但未能代谢全部糖分。优选菌株R12在与酿酒酵母同时及顺序接种的混合发酵中均可保持良好的定植能力,其中顺序接种中R12的增殖量更大;酒样中挥发酸含量随T.delbrueckii接种比例的增加而显著降低。研究表明,本土T.delbrueckii发酵性能优良,具有酿造我国地区特色葡萄酒的广阔应用前景。

Water-soluble UV curable urethane methyl acrylate coating：preparation and properties

Two kinds of water-soluble and ultraviolet (UV) curable oligomers were synthesized and characterized. The oligomers were evaluated as resins for water-based UV curable coating. The rheology of the two oligomers' aqueous so-lutions was investigated in terms of solid fraction, pH dependence, and temperature dependence. The solutions were found to be Newtonian fluid showing rather low viscosity even at high solid fraction of 0.55. The drying process of the coatings and the properties of the cured coatings were studied by comparing them with water-dispersed UV-curable polyurethane methyl acrylate. It was evident that the water-soluble coating dried more slowly; and that the overall properties were inferior to those of the water-dispersed coating.