カプロン酸醗酵に就て (第5報) : 醗酵式の設定

概要

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Inflammable gas, produced by the action of Cl. barkeri on alcoholic medium containing excess of CaCO_3,has been known to be composed of 80% methane and 20% hydrogen.But, when the medium was lacking in carbonate, even though the change of acidity had been prevented by buffer mixture, the fermentation was almost interrupted and the proportion of hydrogen in the gas was increased.Reduction of carbonic acid to methane might be undergone simultaneously with the transformation of ethanol to eaproic acid.From balance sheets obtained by careful analyses, the authors have proposed the following formula as the main path of caproic acid fermentation.3C_2H_5OH→C_5H_11COOH+H_2O+4H 1/2 CO_2+4H→1/2 CH_4+H_2O Hence ; 3C_2H_5OH+1/2CO_2→C_5H_11COOH+1/2CH_4+2H_2O+42.6Calories Small part of the "Garungswasserstoff" may be evolved as gaseous hydrogen, and still smaller part of it may reduce caproic acid to n-hexanol. 4H→2H_2 C_5H_11COOH+4H→C_5H_11CH_2OH+H_2O It will be an interesting fact to see that a microaerophilic spore-former performs methane fermentation.
公益社団法人日本生物工学会の論文
1951-05-15