Fig. 3From: d-Lactic acid production from agricultural residues by membrane integrated continuous fermentation coupled with B vitamin supplementationEffect of B vitamin dose on D-lactic acid fermentation by L. delbrueckii. A Cell growth; B Sugar consumption; C D-lactic acid production. Four essential B vitamins were supplemented in RSH medium with 3 g/l YE at enrichment factors of α = 0.5, 1, 1.5 and 2, respectively. B vitamin enrichment factor of α = 1: thiamine·HCl (VB1), 1070 μg/l; riboflavin (VB2), 495 μg/l; niacin (VB3), 9840 μg/l; Ca-pantothenate (VB5), 2370 μg/lBack to article page