Kinetics of Cellulase and Amylase-producing Fermentation of Bacillus amyloliquefaciens FJAT-8754
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摘要:
目的 解淀粉芽胞杆菌菌株FJAT-8754是一株高产纤维素酶、淀粉酶的芽胞杆菌,具有在复合饲料酶制剂生产中的应用潜力。为深入了解该菌株的发酵进程,以便实现对发酵过程进行最优化控制。 方法 采用50 L发酵罐发酵菌株FJAT-8754,分析发酵过程中菌体数量、pH值、底物浓度、纤维素酶和淀粉酶等的动态变化,并选用Logistic方程和Luedeking-Piret方程构建发酵动力学模型。 结果 根据菌株FJAT-8754发酵过程中各参数变化动态建立了模拟菌体生长、纤维素酶与淀粉酶产生和底物消耗的动力学模型,并应用SPSS 16.0软件对数据进行计算与分析,Origin 9.0软件经非线性拟合与优化,获得了最佳模型参数值。 结论 所构建的动力学模型的计算值与实验值拟合良好,较好地反映了菌株FJAT-8754发酵过程中菌体生长、底物消耗和酶合成的动力学特征。菌株FJAT-8754发酵过程中产物的合成属于生长部分偶联型。 Abstract:Objective To construct a kinetic model for the optimized fermentation of Bacillus amyloliquefaciens FJAT-8754, which was capable of effectively producing cellulase and amylase. Method A 50 L fermenter experiment was conducted to study the cellular growth, pH value, enzyme production and carbohydrate consumption of the fermentation and for subsequent process optimization. A kinetic model was established using the logistic and Luedeking-Piret equations, and experimental data calculated and analyzed with SPSS 16.0 software. Result The optimal fermentation conditions fitted well in the non-linear model as shown by Origin 9.0 software. Conclusion The kinetic model obtained accurately reflected the performance of the fermentation. The cellulase and amylase were products of FJAT-8754 metabolism in the culture. -
Key words:
- Bacillus amyloliquefaciens /
- fermentation /
- kinetic model /
- cellulase /
- amylase
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表 1 菌株FJAT-8754发酵过程中各参数间的相关性
Table 1. Interrelations among FJAT-8754 fermentation parameters
参数
Parameter菌体浓度
Bacteria concentration纤维素酶活力
Cellulase activity溶氧量
Dissolved oxygen总糖浓度
Total sugarpH 淀粉酶活力
Amylase activity还原糖浓度
Reducing sugar菌体浓度Bacteria concentration - 0.99817** -0.69637** -0.996** 0.2035 0.98729** 0.95251** 纤维素酶活力Cellulase activity 0.99817** - -0.6724* -0.99724** 0.22521 0.99043** 0.94422** 溶氧量Dissolved oxygen -0.69637** -0.6724* - 0.64207* 0.48767 -0.58943* -0.83207** 总糖浓度Total sugar -0.996** -0.99724** 0.64207* - -0.28083 -0.99669** -0.92472** pH 0.2035 0.22521 0.48767 -0.28083 - 0.34552 -0.06936 淀粉酶活力Amylase activity 0.98729** 0.99043** -0.58943* -0.99669** 0.34552 - 0.90313** 还原糖浓度Reducing sugar 0.95251** 0.94422** -0.83207** -0.92472** -0.06936 0.90313** - 注:*在0.05水平上显著相关(双向);**在0.01水平上极显著相关(双向)。
Note:*Significantly correlated at 0.05 level (bilateral); **Extremely significantly correlated at 0.01 level (bilateral). -
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