摘要
考察了蜂房哈夫尼菌(H.alveiAS1.1009)的L-赖氨酸脱羧酶对L-赖氨酸的脱羧作用,分析了培养基、温度、pH、激活剂等因素对酶活力的影响。实验结果表明,最适培养基成分为:ρ(蔗糖)=20 g/L、ρ(玉米浆)=20g/L、ρ(酵母膏)=5 g/L、ρ(牛肉膏)=3 g/L、ρ(蛋白胨)=10 g/L、ρ(氯化钠)=5 g/L、ρ(硫酸铵)=2 g/L、ρ(维生素B6)=5 g/L和ρ(L-赖氨酸)=5 g/L,100 mL发酵液中接种量为5 mL液体菌种。最佳转化工艺条件为:转化体系温度35℃、pH=5.0,ρ(菌体)=10 g/L,ρ(吐温-80)=0.15 g/L。L-赖氨酸脱羧酶在最适发酵和转化条件下比酶活可达7 984.43 U,底物转化率可达70%。
L-Lysine can be converted to cadaverine with lysine decarboxylase which is found in Hafnia alvei AS 1. 1009. Factors affecting the enzymatic activity were studied. The optimum fermentation medium consists of p(saccharose) = 20 g/L,p( corn steep liquor) = 20 g/L,p(yeast extract) = 5 g/L, p( beef extract) = 3 g/L ,p (peptone) = 10 g/L ,p (NaCl) = 5 g/L ,p [ ( NH4 ) 2SO4 ] = 2 g/L ,p( vitamin B6 ) = 5 g/L and p(L-lysine) = 5 g/L. 5 mL liquid bacteria was inoculated in 100 mL zymotic fluid. The optimal fermentation conditions are temperature 35 ℃ ,initial pH of the buffer 5.0 ,p(bacterium) = 10 g/L and p( Tween - 80) = 0. 15 g/L. Enzymatic activity can rise to 7 984.43 U and conversion of the substrate reaches 70%.
出处
《精细化工》
EI
CAS
CSCD
北大核心
2006年第11期1060-1063,1067,共5页
Fine Chemicals
基金
国家技术创新基金(02CJ-13-01-16)~~