摘要
目前植物乳杆菌常规发酵产生的植物乳杆菌素产量一般较低,优化植物乳杆菌素的产生条件和分离纯化方法是提高其产量的有效途径。本文以3株Lb.plantarum为实验材料,研究了发酵时间、温度、培养液初始pH值和培养基成分等因素对Plantaricin产量的影响。基于优化培养条件的研究结果,再探究五种不同Plantaricin的分离纯化方法,使两者达到最佳组合。研究发现：（1）发酵时间在28~35 h内,温度30~37℃,培养液初始pH在6.5~7.0,10 g/L葡萄糖和10 g/L蔗糖为碳源,10 g/L蛋白胨、5 g/L牛肉膏和5 g/L酵母粉为氮源,2 g/L磷酸氢二钾、0.2 g/L硫酸镁、0.05 g/L硫酸锰、2 g/L柠檬酸铵和5 g/L乙酸钠为无机盐,1 mL/L吐温-80为乳化剂,优化后Plantaricin产量较优化前提高了1.5倍以上;（2）最佳分离方法为超滤法。发酵液通过超滤法分离后,回收率达到了71%。本研究为获得尽量多的Plantaricin以及Plantaricin工业化开发利用提供理论基础和技术支撑。
At present, the yield of plantaricin produced by Lactobacillus plantarum through conventional fermentation is relatively low. Therefore, optimization of plantaricin production conditions and methods of isolation and purification is an effective approach to improve its yield. In this study, three strains of L. plantarum were chosen as fermentation agents and the effects of fermentation time, temperature, initial pH of the culture, and medium composition on the production of plantaricin were investigated. Based on the results of such optimization techniques,five different methods for separation and purification of plantaricin were explored and the best combination was identified as follows： fermentation time of 28~35 h; temperature at 30 ℃~37 ℃; initial pH of the culture medium at 6.5~7.0; 10 g/L glucose and 10 g/L sucrose as carbon sources; 10 g/L peptone, 5 g/L beef cream, and 5 g/L yeast powder as nitrogen sources; 2 g/L potassium hydrogen phosphate, 0.2 g/L magnesium sulfate, 0.05 g/L manganese sulfate, 2 g/L ammonium citrate, and 5 g/L sodium acetate as inorganic salts; and 1 ml/L tween-80 as emulsifier. Under these optimized culture conditions plantaricin yield increased by at least 1.5 times. The optimal separation method identified as ultrafiltration, where the recovery rate reached 71% after fermentation broth was extracted by ultrafiltration. Results from this study thus provide theoretical and technical evidence for increasing plantaricin yield which will be useful for industrial applications.
出处
《现代食品科技》
EI
CAS
北大核心
2014年第10期218-225,288,共9页
Modern Food Science and Technology
基金
国家自然科学基金资助项目(31160309)
关键词
植物乳杆菌素
产生条件
分离方法
优化
plantaricin
production conditions
separation methods
optimization
