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Table1 Effect of trace elements 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

Run

Medium

d-Lactic acid production

N source (g/l)

B vitamin supplementationa

Elements supplementation

Titer (g/l)

Optical purity (%)

13

YE (3.0)

 + 

Manganese, Iron, Magnesium

46.9

 > 99.0

14

 + 

 + 

Phosphorus, Iron, Magnesium

47.3

 > 99.0

15

 + 

 + 

Phosphorus, Manganese, Magnesium

47.1

 > 99.0

16

 + 

 + 

Phosphorus, Manganese, Iron

1.7

97.2

   

Magnesium (MgSO4·7H2O (g/l))

  

17

 + 

 + 

0.2 (19.3)b

3.2

97.1

18

 + 

 + 

0.4 (38.5)

47.9

99.5

19

 + 

 + 

0.6 (57.8)

47.2

99.2

20

 + 

 + 

0.8 (77.0)

46.6

98.7

21

 + 

 + 

1.0 (96.3)

45.2

97.9

  1. a B vitamins was supplemented as follows (μg/l): thiamine·HCl (VB1), 1070; riboflavin (VB2), 495; niacin (VB3), 9840; Ca-pantothenate (VB5), 2370
  2. b Values in parentheses indicated the concentration of total magnesium content calculated using mg/l as unit