醗酵乳酸の利用に関する研究(第13報) : 脱水操作及び貯蔵中の乳酸重合物の形成について

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The formation process of lactic acid polymer was studied by dehydrating lactic acid solution (edible-brade) from 14.42% (as monomer) to 87〜89% under various conditions at 35℃.In the process of dehydration from 14.42% to 87〜89%, it was found that the polymer was rapidly formed in solutions above the concentration of 50%, especially above 60%, and that the effect of dehydration temperature was remarkable above these concentrations. The lower the temperature of dehydration was, the less the polymer was formed. In view of optical density and loss of lactic acid, it is desirable to be dehydrated at below 50℃, and to be free from impurities, especially sulfuric acid, glucose, and iron ion. Of these impurities, only sulfuric acid accerelated the formation of the polymers.When these solutions were stored at 35℃ after dehydration, there was little differnece in the acidities measured by titration between those after 30 days and after 90 days, but an appropriate change was found in polymer composition even after 90 days, especially in trimer and tetramer.
社団法人日本生物工学会の論文
1959-01-15