Rheological, textural, microstructural and sensory impact of exopolysaccharide-producing Lactobacillus plantarum isolated from camel milk on low-fat akawi cheese

Abstract

The aim of this study was to investigate the influence of EPS-producing Lactobacillus plantarum strains isolated from camel milk on chemical composition, rheological properties, texture profile, microstructure and sensory properties of low-fat akawi cheese. Low-fat akawi cheeses were made using three different cultures; traditional culture (non-EPS), commercial EPS culture (MEPS+; ropy type) and Lb. plantarum isolated from camel milk (CEPS+; ropy type). Moisture and salt contents of cheeses made with EPS+ cultures were higher than those made with non-EPS⁻ culture. The magnitude of storage modulus G′ was significantly higher than loss modulus for all cheeses during all storage periods. The magnitude of elastic G′ and complex G* moduli of non-EPS cheese were higher than MEPS+ and CEPS+ cheeses. Cheeses with non-EPS¯ exhibited more hardness and adhesiveness than MEPS+ and CEPS+ at 0 and 7 days of storage. Hardness of cheeses at 0 day coincided with dynamic parameters, elastic G′ and complex G* moduli. At 0 day, microstructure of non-EPS showed large pores compared to cheeses made with EPS-producing cultures. Cheeses made with non-EPS⁻ had lower scores in adhesiveness, aroma, saltiness and appearance but higher in sourness compared with those made with EPS+ cultures at 0 day of storage.