Probiotic potential of encapsulated Lactobacillus species in yogurt formation indigenously isolated from dairy source

Atia Iqbal, Saba Irshad, Saira Saeed, Aatikah Tareen


Background: Exploration of beneficial bacteria as probiotics inputs are drawing interest in dairy industry but their long-term survival and viability is an important consideration.

Methods: The current work focused on the exploration of probiotic potential of indigenously isolated Lactobacillus strains from dairy products and their encapsulation and utilization in yogurt formation.

Results: These Lactobacillus strains were identified as Lactobacillus fermentum MGA23-1 and Lactobacillus fermentum LMEM19 and found resistant to inhibitory substances like phenol (0.2%), bile salts (0.3%), pancreatin (0.5%) and pepsin (0.3%). The highest antibacterial activity was observed by Lactobacillus fermentum MGA23-1 against Pseudomonas aeruginosa (13mm). Encapsulation experiment showed that the number of bacterial CFU/g increased significantly (p < 0.05) in beads during storage up to 7 days. Chemical characterization of microcapsules was assessed using FTIR and showed characteristics wavelength major at 1541 – 1716 cm-1 and 3336 cm-1. Yogurt was prepared using a single probiotic strain, in a consortium of Lactobacillus fermentum MGA23-1 and Lactobacillus fermentum LMEM19 and in the form of beads. Best results were observed in the case of microencapsulation.

Conclusion: It was concluded that both strains had the potential to be used as a probiotic in the dairy industry.

Keywords: Probiotic; Tolerance to inhibitory substances; Antibacterial activity; Adhesion ability; Safety; Microencapsulation; FTIR   

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