不同氮源及浓度对苹果白兰地酒发酵的影响
Effect of different nitrogen source and concentration on the apple brandy fermentation
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摘要: 以酿酒酵母1023和1620为实验菌株,以富士苹果汁为原料,添加氯化铵、蛋白胨、磷酸氢二铵和L-精氨酸做为有机和无机氮源,分析研究氮源种类及浓度对苹果白兰地发酵过程的影响。结果表明,在相同发酵条件下,添加氮源可以提高酵母酒精发酵力,加速糖的降解;无机氮源发酵酒精度低于有机氮源,且在氮源浓度为150mg/L以上时酒精度均与对照差异显著(p<0.05),其中无机氮源中以氯化铵在水平250mg/L下酒精度最高,有机氮源中以蛋白胨在水平400mg/L下酒精度最高;总酸受不同氮源及浓度的影响,且无机氮源发酵后总酸变化量较有机氮源显著(p<0.05)。Abstract: Effect of the kind and concentration of nitrogen source on apple brandy fermentation was studied with 1023 and 1620 (Saccharomyces cerevisiae) used as fermentation strain and Fuji apple juice as raw material by adding inorganic nitrogen of Ammonium chloride, Diammonium hydrogen phosphate, organic nitrogen of peptone and L (+) -Arginine. The results showed that during the same fermentation conditions, the addition of nitrogen source could improve yeast capability of alcohol production and accelerate sugar degradation. The alcohol degree fermented by inorganic nitrogen was lower than organic nitrogen and there were significant differences of alcohol degree between above nitrogen concentration of 150mg/L and normal control group (p<0.05) . The highest alcohol degree could be obtained with the ammonium chloride concentration of 250mg/L and the peptone concentration of 400mg/L, respectively. The kind and concentration of nitrogen source in apple juice during fermentation effected the changes in total acid, the changes in total acid fermented by inorganic nitrogen were more significant than organic nitrogen (p<0.05) .