Microbiological and Physicochemical Qualities of Moo som (Traditional Thai Fermented Meat) Inoculated with Lactic Acid Bacteria Starter

Abstract

Effect of different strains of lactic acid bacteria (LAB) inoculation on the fermentation rate and qualities of Moo som, a traditional Thai fermented pork was evaluated. Lactobacillus plantarum KL102 (spontaneous starter) and L. plantarum TISIR543 (commercial starter) were used as starter cultures in production of Moo som. The decrease amounts of Staphylococcus aureus and coliforms in Moo som inoculated with L. plantarum KL102 was faster rate than those in Moo som inoculated with L. plantarum TISIR543. However, the final products of Moo som inoculated both LAB starters did not find S. aureus and coliforms loading. Inoculation of both LAB starters could control growth of yeast in samples during fermentation. Furthermore, both starter cultures exhibited a higher rate of fermentation than the control (without inoculum) as demonstrated by the faster rate pH drop and acid production (p < 0.05) during fermentation, while the fermentation of all samples were completed within 3 d. Due to higher acid production rate, texture, especially hardness, gumminess and chewiness of inoculated Moo som were higher than control Moo som in the final products (p < 0.05). From the result, the inoculation of LAB starter was more beneficial in color and overall of sensory evaluation (p < 0.05). The overall quality was positively correlated with the color, odor and texture of Moo som (p < 0.01). Based on microbiological and physicochemical qualities and sensory evaluation, KL102 is a potential LAB starter for Moo som production.

Keywords

• Moo som
• traditional Thai fermented meat
• LAB starter
• Lactobacillus plantarum