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SURVIVAL OF -LACTOBACILLUS BULGARICUS DURING FREEZING AND FREEZE-DRYING AFTER GROWTH IN THE PRESENCE OF CALCIUM.

Author(s) : WRIGHT C. T., KLAEN-HAMMER T. R.

Type of article: Article

Summary

TWO ISOLATES OF L. BULGARICUS 1243 (F AND O), WERE EXAMINED FOR STABILITY DURING FREEZING AND FREEZE-DRYING FOLLOWING GROWTH IN A NUTRIENT BROTH MEDIUM SUPPLEMENTED WITH VARYING CONCENTRATIONS OF CALCIUM. CALCIUM PREVENTED FREEZING DEATH IN BOTH ISOLATES. MAXIMUM SURVIVAL OCCURRED AT CALCIUM CONCENTRATIONS BETWEEN 5.4 X 0,001 AND 6.7 X 0,001M. CALCIUM SUPPLEMENTED L. BULGARICUX 1243-F DISPLAYED A FIVE-FOLD DECLINE IN VIABLE COUNT (3.2 X 100.000.000 TO 6.1 X 10.000.000) DUE TO 253 K (-20 DEG C) FREEZING, COMPARED WITH CELLS PROPAGATED IN BROTH WITHOUT CALCIUM, WHICH DECLINED 200-FOLD (1.7 X 100.000.000 TO 6.3 X 100.000). CALCIUM WAS INEFFECTIVE IN PREVENTING FREEZE-INJURY, SINCE CELLS DISPLAYED DECREASED ACID PRODUCTION IN MILK FOLLOWING 253 K STORAGE.

Details

  • Original title: SURVIVAL OF -LACTOBACILLUS BULGARICUS DURING FREEZING AND FREEZE-DRYING AFTER GROWTH IN THE PRESENCE OF CALCIUM.
  • Record ID : 1984-0387
  • Languages: English
  • Publication date: 1983
  • Source: Source: J. Food Sci.
    vol. 48; n. 3; 1983.05-06; 773-777; 6 fig.; 2 tabl.; 19 ref.
  • Document available for consultation in the library of the IIR headquarters only.

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