THE EFFECT OF MICROENCAPSULATION AND POTATO STARCH ON THE SURVIVAL OF LACTOBACILLUS STRAINS

Liliana LUCA, Mircea OROIAN

Abstract

The effectiveness of encapsulating ofactive bacteria in releasing probiotics depends on cell survival. In this study, a prebiotic - potato starch was used to evaluate its influence on the viability of probiotics  microcapsulated. Lactobacilluscasei, Lactobacillus rhamnosus and Lactobacillus plantarumwas cultured for 16 hours and after that, the cells were added to an emulsion with 1.5% sodium alginate, supplemented with 1% prebiotics and encapsulated. Initial tests revealed that the initial culture concentration is not relevant for prebiotic supplementation. The testing of fresh microcapsules recorded a load of 3.31 × 10 ¹³ cfu/g. After 7 days of storage, the probiotics that survived were 2.53 × 10¹¹ colony-forming unit/g (cfu/g) and, after 30 days 1.7 × 107cfu/g. The probiotics stored for 7 days at 4 °C were tested for achieving the survival rate of the probiotics in the simulated intestinal juice for 1 hour and it was determined a survival rate of 10cfu/g. The simulation for 4 hours in the intestinal juice reported a survival of 106cfu / g. In conclusion, starch is an effective material for encapsulating Lactobacillus cultures.

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