Action of trehalose on the preservation of Lactobacillus delbrueckii ssp. bulgaricus by heat and osmotic dehydration

GÓMEZ ZAVAGLIA A.; TYMCZYSZYN E. E.; DE ANTONI G.; DISALVO E. A.

JOURNAL OF APPLIED MICROBIOLOGY

Society for Applied Microbiology

Lugar: The Blore Tower, The Harpur Centre, Bedford, MK40 1TQ, UK; Año: 2003 vol. 95 p. 1315 - 1320

1364-5072

Aim: This work determines the efficiency of trehalose on the preservation by heat or osmotic drying of a strain of Lactobacillus delbrueckii ssp. bulgaricus. Cell recovery at different trehalose concentrations during drying correlated with the surface properties and osmotic response of cells after rehydration. Methods and Results: Bacteria were dried in the presence of glycerol, trehalose, sucrose at 70ºC and at 20ºC. Trehalose attenuates the loss of viability at 0.25 M. At this concentration, the osmotic response and zeta potential of the bacteria were comparable with the non dried ones. Conclusions: Trehalose diminishes significantly the damage produced by dehydration both when the bacteria are dried by heating or subjected to osmotic dehydration. This effect appears related to the preservation of the permeability to water and the surface potential of the bacteria. Significance and Impact of the Study: Dehydration occurring during heating or during osmosis appears to have similar effects. As dehydration-induced damage is in correlation with osmotic response recovery and is hindered or buffered by the presence of trehalose, it may be related to water eliminated from biological structures involved in water permeation.