GOMEZ ZAVAGLIA Andrea
Galacto-oligosaccharides as protective molecules in the preservation of Lactobacillus delbrueckii subsp. bulgaricus
E. TYMCZYSZYN, E. GERBINO, A. ILLANES, A. GOMEZ ZAVAGLIA
ACADEMIC PRESS INC ELSEVIER SCIENCE
Lugar: Amsterdam; Año: 2011 vol. 62 p. 123 - 129
In this work, the protective capacity of galacto-oligosaccharides in the preservation of Lactobacillus delbrueckii subsp. bulgaricus CIDCA 333 was evaluated Lactobacillus bulgaricus was freeze-dried or dried over silica gel in the presence of three commercial products containing galacto-oligosaccharides. The freeze-dried samples were stored for different times at 5 and 25 ºC. After desiccation, freeze-drying or storage, samples were rehydrated and plate counted. According to the results obtained, all galacto-oligosaccharides assays demonstrated a great efficiency in the preservation of Lactobacillus bulgaricus. The higher content of galacto-oligosaccharides (in particular, of trisaccharides) in the commercial products was correlated with their higher protective capacity. Galacto-oligosaccharides are widely known by their prebiotic properties but their role as protective molecules has not been reported nor properly explored up to now. In this work the protective capacity of galacto-oligosaccharides in the preservation of Lactobacillus bulgaricus, a strain particularly sensitive to any preservation process, was demonstrated. The novel role of galacto-oligosaccharides as protective molecules opens up several perspectives in regard to their applications. The supplementation of probiotics with galacto-oligosaccharides allows the production of self-protected synbiotic products, galacto-oligosaccharides exerting both a prebiotic and protecting effect.