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The quality characteristics of commercial fermented vinegars made with different ingredients were compared. The pH levels of the persimmon, fig, and brewing and rice vinegars were 3.60, 3.37, and 2.62, respectively. The total acid contents of the brewing, apple, and plum vinegars ranged from 6.33 to 6.57%. The free amino acid contents were detected in the following order: brewing vinegar (521.05 mg/100 g) > fig vinegar (358.89 mg/100 g) > persimmon vinegar (353.02 mg/100 g) > rice vinegar (122.31 mg/100 g) > plum vinegar (103.52 mg/100 g). The free amino acid contents of the commercial fermented vinegars were 56.85~358.89 mg/100 g, and their gamma-aminobutyric acid (GABA) contents, 0.21~27.22 mg/100 g. In particular, the GABA content of the fig vinegar was 1.3- to 100-fold higher than those of the other vinegars. The total polyphenol compound and total flavonoid contents were detected in the following order: persimmon vinegar > fig vinegar > brewing vinegar > rice vinegar. Hence, the results of this study can provide a new alternative for making functional vinegars containing organic acid and GABA.

Comparison of characteristics in commercial fermented vinegars made with different ingredients