title: L-Lactic acid fermentation by Enterococcus faecium: a new isolate from bovine rumen.
abstract: OBJECTIVE
  To obtain a novel adaptable stain that can produce enantioselective L-lactic acid efficiently, reduce the operational cost of fermentation process and be suitable for scale production.
  
  
  RESULTS
  Enterococcus faecium S.156 produced 126 g L-lactic acid/l with high optical purity (99.7 %), high productivity (5.25 g/l.h) and a conversion ratio >90 %. L-lactic acid production remained steady from 32 to 40 °C and at pH values from 5.5 to 6.5. O2 made no difference to both biomass growth and the L-lactic acid fermentation. 8 mg folic acid/l combined with 2 mM Fe(2+) substituted for 6 g yeast extract/l, which is a cost-saving.
  
  
  CONCLUSIONS
  The special characteristics and economic traits of E. faecium S.156 make it suitable for industrial-scale production of L-lactic acid.
authors: Food and Fermentation Engineering Key Laboratory of Shandong Province, Jinan, Shandong, People's Republic of China.
authors: Wentao
authors: W
authors: Sun
authors: Jianjun
authors: J
authors: Liu
authors: Hui
authors: H
authors: Xu
authors: Wenjing
authors: W
authors: Li
authors: Jing
authors: J
authors: Zhang
mesh_terms: D000818:Animals; D019149:Bioreactors / Q000382:microbiology*; D002417:Cattle; D016984:Enterococcus faecium / Q000378:metabolism*; D005285:Fermentation; D006863:Hydrogen-Ion Concentration; D019344:Lactic Acid / Q000032:analysis / Q000378:metabolism*; D019216:Metals, Heavy; D010100:Oxygen / Q000378:metabolism; D012417:Rumen / Q000382:microbiology*; D013696:Temperature
chemical_list: D019216:Metals, Heavy; D019344:Lactic Acid; D010100:Oxygen