Effect of galacto-oligosaccharides:maltodextrin matrices on the recovery of Lactobacillus plantarum after spray-drying.

NATALIA SOSA; CAROLINA SCHEBOR; MARINA GOLOWCZYC; ELIZABETH TYMCZYSZYN; ESTEBAN GERBINO; ANDREA GÓMEZ-ZAVAGLIA

FRONTIERS IN MICROBIOLOGY

École Polytechnique Fédérale de Lausanne

Lugar: Lausanne; Año: 2016 vol. 7 p. 584 - 592

In this work maltodextrins were added to comercial galacto-oligosaccharides (GOS) in a 1:1 ratio and their thermophysical characteristics were analyzed. GOS:MD solutions were then used as matrices during spray-drying of Lactobacillus plantarum CIDCA83114. The obtained powders were equilibrated at different relative humidities (RH) and stored at 5 and 20◦C for 12 weeks, or at 30◦C for 6 weeks. The Tgs of GOS:MD matrices were about 20?30◦C higher than those of GOS at RH within 11 and 52%. A linear relation between the spin-spin relaxation time (T2) and T- Tg parameter was observed for GOS:MD matrices equilibrated at 11, 22, 33, and 44 %RH at 5, 20, and 30◦C. Spray-drying of L. plantarum CIDCA83114 in GOS:MD matrices allowed the recovery of 93% microorganisms. In contrast, only 64% microorganisms were recovered when no GOS were included in the dehydration medium. Survival of L. plantarum CIDCA83114 during storage showed the best performance for bacteria stored at 5◦C. In a further step, the slopes of the linear regressions provided information about the rate of microbial inactivation for each storage condition (k values). This information can be useful to calculate the shelf-life of spray-dried starters stored at different temperatures and RH. Using GOS:MD matrices as a dehydration medium enhanced the recovery of L. plantarum CIDCA83114 after spray-drying. This strategy allowed for the first time the spray-drying stabilization of a potentially probiotic strain in the presence of GOS.