Influence of Freezing and Freeze Drying on Intracellular Enzymatic Activity and Autolytic Properties of Some Lactic Acid Bacterial StrainsReport as inadecuate




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Lactic acid bacteriapossess several interesting properties of great economic importance. Improvementand stabilization of these industrially important features are an activeresearch area at the present time. The objectives of this work are to study theeffect of freezing and freeze-drying on the survival rate, autolytic activityand intracellular enzymatic activity of the main species of lactic acidbacteria used in the dairy industry. The article focused on severalcharacteristics that were not well covered in the past. The obtained resultsrevealed that both preservation methods have a significant effect on viability,autolytic activity and intracellular enzymatic activity. After six months ofstorage we found that frozen cultures exhibited higher survival rate, higherrate of intracellular enzymatic activity and lower rate of autolysis. Theimpact of conservation treatments was only strain specific in the case of survivalrate. The results obtained lead to the selection of the best preservationmethod for the selected cultures based on survival rate, autolytic activity andintracellular enzymatic activity.

KEYWORDS

Freeze-Drying, Freezing, Intracellular Enzymes, Lactic Acid Bacteria, Viability, Autolysis

Cite this paper

Kandil, S. and El Soda, M. 2015 Influence of Freezing and Freeze Drying on Intracellular Enzymatic Activity and Autolytic Properties of Some Lactic Acid Bacterial Strains. Advances in Microbiology, 5, 371-382. doi: 10.4236-aim.2015.56039.





Author: S. Kandil, M. El Soda*

Source: http://www.scirp.org/



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