Reevaluating a non-conventional procedure to microencapsulate beneficial lactobacilli: assessments on yield and bacterial viability under simulated technological and physiological conditions

BACKGROUND Maintaining viability of beneficial microorganisms applied to foods still constitutes an industrial challenge. Many microencapsulation methodologies have been studied to protect probiotic microorganisms and ensure their resistance from manufacturing through to consumption. However, in many Latin-American countries such as Argentina there are still no marketed food products containing microencapsulated beneficial bacteria. The objectives of this work were: (i) to obtain microcapsules containing Lactobacillus fermentum L23 and L. rhamnosus L60 in a milk protein matrix; and (ii) to evaluate the viability of microencapsulated lactobacilli exposed to long-term refrigerated storage, mid-high temperatures and simulated gastrointestinal conditions. RESULTS The method of emulsification/rennet-catalyzed gelation of milk proteins used in this study led to high encapsulation yields for both strains (98.2-99%). Microencapsulated lactobacilli remained viable for 120 days at 4 degrees C, while free lactobacilli gradually lost their viability under the same conditions. Microencapsulation increased the resistance of lactobacilli to mid-high temperatures, since they showed survival rates of 95-99.3% at 50 degrees C, and of 72.5-74.4% at 65 degrees C. Under simulated gastric conditions, the microencapsulated lactobacilli counts were higher than 8.5 log CFU mL(-1) and showed survival rates between 96.61% and 97.74%. Furthermore, in the presence of bile (0.5-2% w/v) the survival of microencapsulated strains was higher than 96%. CONCLUSION The microencapsulation process together with the matrix of milk proteins used in this study protected beneficial Lactobacillus strains against these first simulated technological and physiological conditions. These findings suggest that this microencapsulation method could contribute to secure optimal amounts of living lactobacilli cells able to reach the intestine. (c) 2021 Society of Chemical Industry.

Automated summary

The study aimed to obtain microcapsules containing Lactobacillus fermentum L23 and L. rhamnosus L60 in a milk protein matrix, and evaluate their viability under different conditions. The results showed that microencapsulated lactobacilli had high encapsulation yields, remained viable for 120 days at 4 degrees C, and exhibited increased resistance to mid-high temperatures and simulated gastrointestinal conditions. The conclusion highlighted that the microencapsulation process using milk proteins protected beneficial Lactobacillus strains against technological and physiological conditions, suggesting its potential for delivering living lactobacilli cells to the intestine.