C. Vishnu et al., Direct conversion of starch to L(+) lactic acid by amylase producing Lactobacillus amylophilus GV6, BIOPROC ENG, 23(2), 2000, pp. 155-158
Lactobacillus amylophilus strain GV6, isolated from corn starch processing
industrial wastes, was amylolytic and produced 0.96 g L(+) lactic acid per
gram of soluble starch. The optimum temperature and pH for growth and L(+)
lactic acid production were 37 degrees C and 6.5, respectively. At low subs
trate concentrations, the lactic acid production on corn starch was almost
similar to soluble starch. The strain is fermenting various naturally avail
able starches directly to lactic acid. The total amylase activity of the st
rain is 0.59 U/ml/min. The strain produced 49 and 76.2 g/l L(+) lactic acid
from 60 g/l corn starch and 90 g/l soluble starch, respectively. This is t
he highest L(+) lactic acid among the wild strains of L. amylophilus report
ed so far.