影响己酸菌生长、代谢的主要因素

Main Factors Influencing the Growth and the Metaboly of Caproic Acid Bacteria

影响己酸菌生长、代谢的主要因素有培养基组分、其他微生物、温度和酸度等。碳源是己酸菌生长的能量来源,一般入窖淀粉维持在15%～17%,即可满足其生长所需;氮源是维持己酸菌生长发育不可缺少的,主要来源于曲粉、糟醅和窖池中死亡的微生物菌体蛋白;水分是微生物细胞的重要组成部分,窖泥中维持40%～48%的水分,入池糟醅中维持53%～55%的水分即可满足己酸菌的生长代谢需要;无机盐是构成己酸菌的成分,有维持其酶活和调节渗透压的功能。乳酸菌对己酸菌有抑制作用,醋酸菌和甲烷菌是己酸菌的伴生菌,对其生长代谢有促进作用,放线菌可为己酸菌生长提供氮源。己酸菌最佳生长温度为35℃左右,pH小于4.5时,己酸菌的生长代谢将受到严重影响。(小雨)

The main factors influ en cing the growth and the metaboly of caproic acid bacteria were the components of culture medium,other acid bacteria,temperature and acidity etc.Carbon source was the energy source for the growth of caproic acid bacteria,and15%～17 %amylum content for pit entry could meet the requirements of the growth of cap roic acid bacteria.Nitrogen source was indis-pensable to the growth of caproic acid bacteria and it mainly derived from starter powder,distiller's grains and the dead microbial thalli albumen.Moisture content was an important componen t part of microbial cells and40%～48%moisture content in pit mud and53 %～55%moisture content in distiller's grains for pit entry could meet the r equirements of the metaboly of caproic acid bacteria.In-organic salt was the c onstituent of caproic acid bacteria and it had the functions of maintaining the enzyme activity and adjusting os-motic pressure.Lactobacillus could inhibit the growth of caproic acid bacteria,and acetic bacteria and methane bacteria we re the asso-ciate bacteria of caproic acid bacteria which could accelerate the growth and the metaboly of caproic acid bacteria.The optimal growth temperature of caproic acid bacteria was at about 35℃.pH value less than4.5would ser iously damage the growth and the metaboly of caproic acid bacteria.(Tran.by Y UE Yang)