Rhizopus 屬菌の乳酸生成能について(第5報) : Rhizopus の呈する Homo-乳酸醗酵

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In the previous paper (Part III) we had pointed out that Ba^<・・> increased the yield of lactic acid by Rhizopus Oryzae to 75.9%. But, we saw BaCO_3 which was added as neutralizer improved the yield to 80.4% when glucose concentration was suitable (7%).Small amount of Pb also revealed similar behavior, and it increased the yield of lactic acid to 82.9%.Finally we obtained the yield of lactic acid so high as 99%. when about 1.25% of Ba^・ (in the form of BaCl_2) was added in glucose-CaCO_3 medium using secondary cnlture method.From the above experimental facts, we denied the Waksman-Foster's formula which had been proposed for the lactic acid fermentation of Rhizopus group (2C_6H_<12>O_6=3C_3 H_6O_3+C_2H_5OH+CO_2), and confirmed our supposition that the lactic acid formation by Rhizopus Oryzae conforms essentially to homofermentation formula(C_6H_<12>O_6=2C_3H_6O_3).
社団法人日本生物工学会の論文
1950-02-15