Toshinori Hirano*, Kohtaro Kirimura, Shoji Usami

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The conditions for the protoplast formation and the cell wall regeneration of Lactobacillus casei IFO-3831 are described. Since L. casei was resistant to the action of lysozyme, the cell wall digestion was insufficient when the cells were treated with lysozyme at various concentrations. The protoplasts were successfully produced by the treatment with mutanolysin. Approximately 100% of protoplast forming ratio was achieved when the cell suspension was incubated in the presence of 50 unit/ml of the enzyme in 5 mM Tris-maleate-0. 09 M sucrose solution (pH 6. 2) at 37 degree C for 60 min. The burst of protoplasts and the autolysis of cells happened in the buffer solution containing mutanolysin without magnesium ion, but they were restrained by addition of 10 mM magnesium ion as a final concentration to the buffer solution. The protoplast regeneration was achieved when the samples were diluted and spread over the surface of a regeneration medium. 1. 41% of the cells retained osmotic stability. The regeneration ratio of protoplasts was 1. 8%.

Original languageEnglish
Pages (from-to)35-40
Number of pages6
JournalWaseda Daigaku Rikogaku Kenkyusho Hokoku/Bulletin of Science and Engineering Research Laboratory, Waseda University
Issue number110
Publication statusPublished - 1985 Dec 1

ASJC Scopus subject areas

  • Engineering(all)


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