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Lactic acid bacteria (LAB) producing phenyllactic acid (PLA), which is known as antimicrobial compound, was isolated from button mushroom bed and the isolated LAB was identified to Lactobacillus casei by 16 rRNA gene sequence analysis. Cell-free supernatant (CFS) from L. casei was assessed for both the capability to produce the antimicrobial compound PLA and the antifungal activity against three fungal pathogens (Rhizoctonia solani, Botrytis cinerea, and Collectotricum aculatum). PLA concentration was investigated to be 3.23 mM in CFS when L. casei was grown in MRS broth containing 5 mM phenylpyruvic acid as precursor for 16 h. Antifungal activity demonstrated that all fungal pathogens were sensitive to 5% CFS (v/v) of L. casei with average growth inhibitions ranging from 34.58% to 65.15% (p < 0.005), in which R. solani was the most sensitive to 65.15% and followed by C. aculatum, and B. cinerea. The minimum inhibitory concentration (MIC) for commercial PLA was also investigated to show the same trend in the range of 0.35 mg mL-1 (2.11 mM) to 0.7 mg mL-1 (4.21 mM) at pH 4.0. The inhibition ability of CFS against the pathogens were not affected by the heating or protease treatment. However, pH modification in CFS to 6.5 resulted in an extreme reduction in their antifungal activity. These results may indicate that antifungal activities in CFS was caused by acidic compounds like PLA or organic acids rather than protein or peptide molecules.
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참고문헌 (22)
참고문헌 신청
Dieuleveux V / 1998 / Antimicrobial spectrum and target site of D-3-phenyllactic acid / Int J Food Microbiol 40:177~183
Dieuleveux V / 1998 / Antimicrobial effects of D-3-phenyllactic acid on Listeria monocytogenesin TSBYE medium, milk, and cheese / J Food Prot 61:1281~1285
Gerez CL / 2013 / Control of spoilage fungi by lactic acid bacteria / Biol Control 64:231~237
Hladikova Z / 2012 / Antimicrobial activity of selected lactic acid cocci and production of organic acids / Acta Chim Slov 5:80~85
Kumar S / 2001 / MEGA2: molecular evolutionary genetics analysis software / Bioinformatics 17:1244~1245
Dieuleveux V / 1998 / Antimicrobial effects of D-3-phenyllactic acid on Listeria monocytogenesin TSBYE medium, milk, and cheese / J Food Prot 61:1281~1285
Gerez CL / 2013 / Control of spoilage fungi by lactic acid bacteria / Biol Control 64:231~237
Hladikova Z / 2012 / Antimicrobial activity of selected lactic acid cocci and production of organic acids / Acta Chim Slov 5:80~85
Kumar S / 2001 / MEGA2: molecular evolutionary genetics analysis software / Bioinformatics 17:1244~1245
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