反应详情

A reaction solution containing maleic acid (116 g) and 5N sodium hydroxide (200 ml) (having a total volume of 1,000 ml by adding water), which had been previously subjected to N2 substitution by carrying out agitation while blowing N2 gas in it for 30 minutes, was transferred into a jar fermenter having a volume of 3 L. The microbial cells of the both species (IFO 12669 strain: 20 g, AB-41 strain: 50 g), which had been recovered in Example 1 and in the item (1) described above, were added thereto, followed by agitation while supplying N2 at a velocity of 0.02 vvm to carry out a reaction at 30° C. for 36 hours with sealing. L-Malic acid was obtained in an amount of 104 g/L. Calcium chloride was added to the obtained solution of sodium L-malate to precipitate calcium malate, followed by washing with water. After that, L-malic acid was separated by using an ion exchange resin, and dried. Thus crystals of L-malic acid were obtained. The obtained crystals had an amount of 90 g.

1. customto precipitate calcium malate
2. washby washing with water
3. customAfter that, L-malic acid was separated
4. customdried