Effects of protective agents on membrane fluidity of freeze-dried Lactobacillus delbrueckii ssp. bulgaricus.

Abstract:

AIMS:To evaluate the effect of protective agents upon survival of Lactobacillus delbrueckii ssp. bulgaricus during freeze-drying and storage, and selective amino acids on cell membrane fluidity. METHODS AND RESULTS:The protective effect of amino-acids and sugars at different concentrations was studied by determining the viability of lyophilized cells after storage under air at 30 degrees C. Survival following freeze-drying was improved by all compounds. During storage, neither proline nor maltose had protective effects on lyophilized Lact. delbrueckii ssp. bulgaricus. Glutamate 5% and aspartate 5% showed similar protection capability during freeze-drying (94-95%) and after storage (92-99%). Fluorescence probes (DPH and TMA-DPH) were used to study the effect of both amino acids on membrane fluidity. Polarization decreased with increasing concentrations of glutamate or aspartate. Lowest values were observed with TMA-DPH. CONCLUSIONS:Glutamate 5% and aspartate 5% allowed maintaining high viability rates during freeze-drying and storage of Lact. delbrueckii ssp. bulgaricus because of an increase of the membrane fluidity by inserting in the interfacial region of bacterial plasma membrane. SIGNIFICANCE AND IMPACT OF THE STUDY:These results show the first evidence of the mechanisms underlying glutamate and aspartate as lyoprotectors.

journal_name

Lett Appl Microbiol

authors

Martos GI,Minahk CJ,de Valdez GF,Morero R

doi

10.1111/j.1472-765X.2007.02188.x

subject

Has Abstract

pub_date

2007-09-01 00:00:00

pages

282-8

issue

3

eissn

0266-8254

issn

1472-765X

pii

LAM2188

journal_volume

45

pub_type

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