醗酵乳酸の利用に関する研究(第14報) : 乳酸重合物の形成機構

概要

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The formation mechanism of lactic acid polymers was studied by heating lactic acid solution (88〜89% as monomer) in a boiling water bath. With the progress of the reaction, the acidity measured by titration was decreased and the back titration value increased rapidly and trimer increased slowly as compared with dimer, but tetramer increased most slowly.Judging from the formation mechanism of the polymer, it is reasonable that dimer is formed from two monomers and trimer from dimer and monomer. However, it seems probable that tetramer is formed from trimer and monomer and Nmer (N=degree of polymerization) from (N-1) mer and monomer.It was found that the composition of a lactic acid solution after 40 hrs heating in the boiling water bath was increased in the amount of lactic acid polymers in the presence of sulfuric acid and p-toluene sulfonic acid. The amount of polymers in a solution increased with the amount of sulfuric acid used.
社団法人日本生物工学会の論文
1959-02-15