Document Detail


Effect of lipid composition on the stability of cellular membranes during freeze-thawing of Lactobacillus acidophilus grown at different temperatures.
MedLine Citation:
PMID:  11368153     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Lactobacillus acidophilus CRL 640 grown at the optimal temperature of 37 degrees C (M37) appeared more sensitive to freeze-thawing than when it was grown at 25 degrees C (M25). In the first case, 87% of the cells died, in contrast to 33% for cells grown at 25 degrees C. All the surviving M37 cells showed sensitivity to NaCl. However, among the surviving M25 cells, only 85% were sensitive to NaCl. The rest of the cells were considered uninjured. Freeze-thawing in cells grown at 25 degrees C showed a liberation of nucleic acids and proteins. However, the leakage was higher in M37 cells after freeze-thawing. The greater fraction of damaged cells were observed in M25 culture after freeze-thawing. A relative increase of 81% in cardiolipid (CL), with respect to total phospholipids and 72% triglycosyldiglyceride (TGDG) with respect to the total glycolipids was observed in M37. In addition, a decrease of palmitoyl (C16:0), oleoyl (C18:0) fatty acids at CL, phosphatidylglycerol (PG), and diglicosyldiglyceride (DGDG) fractions and the increase of C19 cyc and C18:0, 10-OH fatty acids in neutral lipid, and CL fractions was also apparent. In M25 cells, the concentration of DGDG and PG was higher than in M37 cells. The difference in cryotolerance between the frozen cultures emphasizes the importance of selecting appropriate conditions of growth of microorganisms for use as dietary adjuncts.
Authors:
M L Fernández Murga; G Font de Valdez; E A Disalvo
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Archives of biochemistry and biophysics     Volume:  388     ISSN:  0003-9861     ISO Abbreviation:  Arch. Biochem. Biophys.     Publication Date:  2001 Apr 
Date Detail:
Created Date:  2001-05-22     Completed Date:  2001-05-24     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0372430     Medline TA:  Arch Biochem Biophys     Country:  United States    
Other Details:
Languages:  eng     Pagination:  179-84     Citation Subset:  IM    
Affiliation:
Centro de Referencia para Lactobacilos, San Miguel de Tucumán, Argentina.
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MeSH Terms
Descriptor/Qualifier:
Cell Membrane / chemistry,  physiology
Fatty Acids / chemistry*,  metabolism
Lactobacillus acidophilus / chemistry*,  physiology
Temperature*
Chemical
Reg. No./Substance:
0/Fatty Acids

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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