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Table 2 Effect of B vitamin dose on d-lactic acid production by L. delbrueckii

From: d-Lactic acid production from agricultural residues by membrane integrated continuous fermentation coupled with B vitamin supplementation

B vitamins (α =)a

Cell mass (g/l)

d-lactic acid

Titer (g/l/)

Enhancement by B vitamins (%)b

Productivity (g/l/h)

Yield (g/g)c

Optical purity (%)

0

2.48

20.3

-

1.13

0.86

98.3

0.5

3.98

30.7

51.23

1.82

0.90

98.8

1.0

5.21

47.6

134.48

2.64

0.95

99.5

1.5

5.43

46.2

127.56

2.57

0.93

99.2

2.0

5.61

44.3

118.23

2.46

0.89

97.6

  1. a α: enrichment factor of B vitamin. B vitamin (α = 1) was supplemented as follows (μg/l): thiamine·HCl (VB1), 1070; riboflavin
  2. (VB2), 495; niacin (VB3), 9840; Ca-pantothenate (VB5), 2370
  3. b Enhancement (%) = [D-lactic acid titer (α = 0.5, 0.5, 1, 2)—D-lactic acid titer (α = 0)]/ D-lactic acid titer (α = 0)
  4. c D-lactic acid yield based on sugar consumed
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Biotechnology for Biofuels and Bioproducts

ISSN: 2731-3654

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