Production of γ–aminobutyric acid–enriched sourdough bread using an isolated Pediococcus pentosaceus strain JC30

A γ–aminobutyric acid (GABA)–producing strain JC30 was isolated from traditional kimchi, which was identified as Pediococcus pentosaceus by 16S rDNA sequencing. P. pentosaceus JC30 was highly tolerant to acid, bile salt, and high temperatures. The survival rate of JC30 in MRS medium (pH 2.5) for 3 h was 60.96%. Furthermore, the survival rate of JC30 in MRS medium with 3 mg/mL bile salt for 24 h was 86.62%. The survival rate of JC30 in MRS medium at 56°C and 58°C for 10 min was 97.17% and 78.20%, respectively. When 2% v/v JC30 (8.0 log10 CFU/mL) was added to prepare sourdough and the sourdough was then used to make bread, the bread had a higher specific volume (5.13 ± 0.12 mL/g) and GABA content (3.32 ± 0.04 mg/g DW) than the control.