Lactic acid fermentation bacteria

In addition to lactic acid fermentation process can be used to produce L-lactic acid by Rhizopus, the current exhibition at home and abroad are Opened on the production of L-lactic acid bacterial fermentation studies. The reason is that the bacteria can be large-scale anaerobic fermentation Mode to reduce energy consumption, reduce lactic acid production costs make up Rhizopus L-lactic acid fermentation of the existence of Defects and deficiencies. Zhang et al studied the food starch ¨ Zinc lactate NR-RL B4542 directly from Production of L-lactic acid fermentation of starch conditions, the initial concentration of starch was 120g / L, from liquefied starch Starting powder can be produced at 20h concentration of 96.2g / L of lactic acid. Hujanen etc. ¨ on stem Coli NRRL B buttermilk one of L-lactic acid 441 to optimize the concentration of glucose 160g / L, The lactate concentration can reach 118.6g / L, they use cheap barley malt extract Plus a small amount of yeast extract (4g / L) instead of the yeast extract alone (22g / L), a large savings Production costs. Le Xiaojie, who use ultraviolet mutagenesis methods, ferrous lactate strain YBQ1-1 mutagenesis treatment, screened a strain mutant forward YBQH2-14, an L Lactic acid production reached 93g / L, the conversion rate of glucose 77.5%. Capacity than the original strain Acid increased by 48.5%. Xu Zaijun etc. ¨ empty fermentation of metabolic tune theoretical basis, the use of ultraviolet Line, nitrosoguanidine, DES and other physical and chemical cause. Son compound mutation on lactic acid bacteria, and then high concentration Lactate plate, pure lactic acid tablet, succinic flat screened a high yield L-lactic acid Forward mutant M7, the average yield of the fermentation 90g / L, compared with the original strain yield increased by 30 percent,The conversion was 88.9% sugar.magnessium lactate, etc. u adopt a new source of a physical mutagen N ion implantation Into the starting strain of lactic acid bacteria LB1 mutagenesis improvement, obtain an L-lactic acid production than
2 times higher strain mutant LB1-1. Zheng Yan, etc. ¨ to get a cheese milk screening Subtilis subsp rhamnosus R2 is a mutant strain, by UV, diethyl sulfate, compound Mutagenic treatment, screening high lactate produced mutant zY, L-lactic acid yield of 9.57g / 200m1. L-lactic acid content of 93.9%, sugar conversion rate of 96.3%.