Effect of extracted pectin from fruit wastes on growth of Pediococcus pentosaceus RSU-Nh1 and Lactobacillus plantarum RSU-SO2
2020
Showpanish, K. | Sonhom, N. | Pilasombut, K. | Woraprayote, W. | Prachom, N. | Buathong, R. | Yodsenee, K. | Somsri, A. | Rumjuankiat, K.
Two strains of lactic acid bacteria identified as Pediococcus pentosaceus RSU-Nh1 and Lactobacillus plantarum RSU-SO2 were isolated from Thai fermented pork sausage (Nham) and fermented spring onion (Ton-Hom-Dong) respectively. The culture supernatant (CFS) of both strains exhibited antimicrobial activity against both Gram-positive and Gram-negative pathogenic bacteria. After being treated with alpha-chymotrypsin and trypsin, the antimicrobial activity of their CFS was eliminated, which suggests that the antimicrobial compound produced was antimicrobial peptide or bacteriocin. Pectin extracted from different fruit peels was supplemented in the bacterial growth medium to investigate the effect of pectin on the growth and antimicrobial production of Ped. pentosaceus RSU-Nh1 and Lb. plantarum RSU-SO2. Pectin was extracted from pomelo, durian, passion fruit and salacca fruit peels with a pectin yield of 5.02 to 26.44%, degree of esterification of 80.84 to 86.68%, and galacturonic acid content of 52.36 to 64.23%. Supplementation with pomelo and passion fruit pectin exhibited the highest improvement of bacterial growth and antimicrobial production of Ped. pentosaceus RSU-Nh1 and Lb. plantarum RSU-SO2. These findings suggested the potential application of these pectin extracts as prebiotics to promote the growth and antimicrobial production of lactic acid bacteria.
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