Abstract
Production of D-xylose and L-arabinose isomerases by lactic acid bacteria was greatly promoted by the addition of manganese ions in cultural medium. Effective concentration of the ions was 5×10-3M. Ferrous ions were also effective for the production of D-xylose isomerase and cobaltous ions were somewhat effective for the production of L-arabinose isomerase. Zinc and cadmium ions inhibited bacterial growth. It was possible to increase the production of isomerase by changing MnSO4 concentration to 5×10-3M (0.11%) in place of 0.001 per cent in the normal medium.
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