衡水老白干酒大曲分离具有酯化力霉菌及其特性研究

以衡水老白干酒大曲中分离纯化出的3株霉菌为研究对象，以酯化力为评价指标，通过二级筛选得到1株高酯化力霉菌8号，初步鉴定为毛霉。将其制作成纯种的麸曲进行培养条件优化。结果表明，大曲在目前已测定的10个碳原子以下的酸醇反应中，对己酸乙酯具有最高酯化力101.29 mg/g麸曲。8号菌在最适培养温度36 ℃，酸度0.40度，固态发酵培养基含水量50%，固态发酵培养基厚度10 mm时，具有最高酯化力263.55 mg/g麸曲（以乙酸乙酯计）。

Isolation and performances of esterifying moulds from Hengshui Laobaigan Baijiu Daqu

Using 3 strains of moulds separated and purified from Hengshui Laobaigan Baijiu Daqu as research object and using esterifying power as indicator, a dominate strain No.8 with high esterifying power was obtained by secondary screening, and it was identified as Mucor spp.. The mould was made into purebred bran koji and the culture condition was optimized. The results indicated that Daqu had the highest esterifying power to ethyl caproate of 101.29 mg/g bran koji in the reaction of acid alcohols with under 10 carbon atoms measured at present. Strain No.8 had the highest esterifying power of 263.55 mg/g (meter with ethyl acetate), at the optimum culture condition of temperature 36 ℃, acidity 0.40°, moisture in solid state fermentation medium 50%, and solid fermentation medium thickness 10 mm.