Optimization of Media Composition to Maximize the Yield of Exopolysaccharides Production byLactobacillus rhamnosusStrains

Growth media composition is a critical factor influencing the yield of bacterial exopolysaccharides (EPSs), which have attracted the interest of researchers around the world due to their diverse physicochemical and biological properties. This work presents the optimization of media for EPS synthesis by threeLactobacillus rhamnosusstrains, namely LOCK 0943, LOCK 0935, and OM-1. The optimized media led to a more than 13-fold increase in EPS yield forL. rhamnosusLOCK 0943 (from 85 to 1138.2 mg/L), an almost 9-fold increase forL. rhamnosusLOCK 0935 (from 103.67 to 900 mg/L), and a more than 7-fold increase forL. rhamnosusOM-1 (from 133.67 to 987.84 mg/L) as compared to cultures in standard MRS medium (de Man, Rogosa, and Sharpe). It has been found that the main medium-related determinant of EPS synthesis by the studiedL. rhamnosusstrains are the carbon source-in this case, it was fructose and sucrose.