食品科学 ›› 2007, Vol. 28 ›› Issue (3): 178-182.

• 生物工程 • 上一篇    下一篇

双歧杆菌麦芽复合汁增菌培养基优选的研究

 种克, 田洪涛, 桑亚新, 李英军, 马晓燕, 庞晓娜   

  1. 河北农业大学食品科技学院; 河北农业大学食品科技学院 河北保定071001; 河北保定071001;
  • 出版日期:2007-03-15 发布日期:2011-12-31

Optimization of Reproducible Wort Medium for Bifidobacteria

ZHONG  Ke, TIAN  Hong-Tao, SANG  Ya-Xin, LI  Ying-Jun, MA  Xiao-Yan, PANG  Xiao-Na   

  1. College of Food Science and Technology, Agricultural University of Hebei, Baoding 071001, China
  • Online:2007-03-15 Published:2011-12-31

摘要: 选择麦芽汁为主要原料,以两歧双歧杆菌Bbm和长双歧杆菌Blm为实验菌株,研究了麦芽汁基础培养基中添加单一营养因子对Bbm菌细胞生长量的影响,进一步利用正交试验优化筛选出Bbm菌麦芽复合汁增菌培养基;利用优选的麦芽复合汁增菌培养基对Blm菌进行验证性增菌试验。结果表明:大豆蛋白胨、牛肉浸膏、酵母膏、玉米浆可显著促进双歧杆菌Bbm的细胞增殖(p<0.01),而磷酸氢二钾既能促进Bbm生长,又有缓冲培养基pH值的作用;利用L9(34)筛选出Bbm的麦芽复合汁增菌培养基的最佳配比为:在10°麦芽汁中添加0.3%大豆蛋白胨,0.6%牛肉浸膏,0.5%酵母膏,0.4%玉米浆,0.2%磷酸氢二钾,在麦芽复合汁增菌培养基中,经37℃培养12h,Bbm活菌数3.84×109CFU/ml,Blm活菌数达到3.90×109CFU/ml,较对照麦芽汁培养基的活菌数分别提高了8.17倍和8.14倍,较实验室常用的改良MRS培养基的成本降低1000元/吨。

关键词: 双歧杆菌, 麦芽复合汁增菌培养基, 优化筛选

Abstract: Wort was chosen for the experiment. Effects of adding different nutriments in wort on the growth of Bbm Bifidobacterium bifidus were examined. The optimum enrichment medium of Bbm was screened with orthogonality test. Blm was validated in the optimum enrichment medium. The results showed that soya peptone, beef extract, yeast extract, and maize hydrolyzates in wort all promote the growth of Bbm (p<0.01), and the addition of K2HPO4 plays a role to both promote the growth and buffer the medium pH as well. The optimum enrichment media obtained by orthogonal test consist of adding soyapeptone 0.3%, beef extract 0.6%, yeast extract 0.5%, maize hydrolyzates 0.4%, K2HPO4 0.2% in 10°Brix wort, cultivated in the optimum enrichment medium for 12 hours at 37℃ with the live counts 3.84×109CFU/ml of Bbm and 3.90×109CFU/ml of Blm, increased by 8.17 and 8.14 times respectively, higher than the control. The cost decreases1000$/t compared with modified MRS medium used in lab.

Key words: Bifidobacteria, enrichment medium of wort, optimal screening