Abstract:
Lactic acid bacteria is a group of bacteria gain interested in various industries, in particular, Food industry owing to their abilities of producing metabolites. Among them couple to the widely acceptance as GRAS (generally recognized as safe) without altering their tastes contribute to highly attracted to food industry. In the present study, samples were collected from Thai fermented vegetables and fruits. Eighty eight isolated with ability in producing exopolysaccharide on MRS medium were isolated. Among these, 8 isolates (P01-P08) showed higher mucoid colonies were selected for further studies. Morphological, chemical, physiological and biochemical studies were performed thus, the bacteria obtained could be classified as genera Leuconostoc, Lactobacillus, Acetobacter and Pediococcus by which the strain P06 (Pediococcus pentosaceus) gave highest exopolysaccharide production at 21.91± 0.98 g/l in MRS supplemented with 4% sucrose. Analysis of its monosaccharide content upon acid digestion followed by HPLC analysis revealed glucose as the only monosaccharide present. This exopolysaccharide is soluble in distilled water but failed to dissolved in organic solvent including methanol, acetone, isopropanol and butanol. As the important features of the polysaccharide for their employment in Mayonnaise production are their emulsifying activities as well as viscosities obtained. We therefore selected P06 EPS producer in further studies in which P6 exopolysaccharide was added into 3 formula of Mayonnaise including: low fat mayonnaise which is form of Reduced oil (RF); Reduced egg yolk (RE) and Reduced both oil and egg yolk (RFE using Full fat (FF) and low fat mayonnaise from commercial (Heinz) as a control. EPS P06 showed highest emulsified activity in olive oil as well as highest viscosity at 0.613 Pa·s as well. Regarding their rheology, 5% RF and 3% RFE showed 32.722 Pa·s and 28.928 Pa·s respectively the vales of which higher than control (commercially available) 25.433 Pa·s. In addition, 3% RFE mayonnaise gave lowest caloric value (6.11 kcal/g) slightly higher than that of commercial low fat mayonnaise (5.42 kcal/g).