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Effect of freezing and thawing on the viability and uptake of amino acids by Lactobacillus delbrueckii ssp. bulgaricus.

Author(s) : VALDEZ G. F. de, GIORI G. S. de

Type of article: Article

Summary

Freezing and thawing damaged the cell membrane of Lactobacillus delbrueckii ssp. bulgaricus, thus rendering the microorganism sensitive to sodium chloride and liver extract. These substances had no inhibitory effect on the unfrozen cells. The amino acids transport system was also depressed in all the freezing regimens tested, a fact that indicates the existence of a close relationship between this system and the viability of the cells. Cell injury proved reversible and could be partially repaired with a solution of KH(2)PO(4), pyruvate, and sulphate.

Details

  • Original title: Effect of freezing and thawing on the viability and uptake of amino acids by Lactobacillus delbrueckii ssp. bulgaricus.
  • Record ID : 1994-1865
  • Languages: English
  • Source: Cryobiology - vol. 30 - n. 3
  • Publication date: 1993/06

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