Spray Drying Encapsulation of Probiotic Bacteria in Whey Protein Matrix for Shelf-Life Extension

Abstract

The preservation of probiotic bacterial viability during processing and storage is a critical challenge in the development of functional food and pharmaceutical products. The present study investigates the spray drying encapsulation of probiotic bacteria using a whey protein matrix for enhanced shelf-life extension and stability under controlled processing conditions. The research focuses on evaluating encapsulation efficiency, bacterial survival, moisture characteristics, thermal stability, and storage performance associated with spray-dried probiotic formulations. Experimental analysis was conducted to examine the influence of inlet air temperature, feed flow rate, whey protein concentration, drying conditions, and storage environment on probiotic viability and encapsulation quality. Results demonstrate that whey protein matrices effectively protect probiotic cells during spray drying by forming a stable encapsulating barrier that reduces thermal and oxidative stress. The study further reveals that optimized drying parameters significantly improve bacterial survival rates and maintain probiotic functionality during prolonged storage periods. Lower moisture content and controlled drying conditions contributed to enhanced powder stability, reduced microbial degradation, and improved shelf-life characteristics. Comparative assessment with non-encapsulated probiotic systems confirms the advantages of spray drying encapsulation, including improved storage stability, easier handling, and enhanced protection against adverse environmental conditions. In addition, the whey protein carrier exhibited favorable physicochemical properties suitable for incorporation into food and nutraceutical products.