Abstract
Paocai is a popular fermented vegetable side dish or appetizer in China. This study was to investigate the quality and microbial flora changes of paocai during the multiple rounds of fermentation, in order to provide practical suggestions for the industrial production. A total of 4 kinds of lactic acid bacteria were identified based on morphology and calcium dissolution zone size and further 16s RNA identifications. The paocai quality was evaluated on titratable acid, organic acid, amino acid and volatile components content. The results showed that the brine starters after the 4 rounds of fermentation could significantly accelerate the fermentation process from 6 days to only 1–2 days. After 4th round of fermentation, the quality of radish paocai was roughly unified as regard for the microbial flora, organic acid, free amino acid and volatile components content at the maturation point. Therefore, the brine after 4th round of radish paocai fermentation could be used as starters for radish paocai production in industrial scale.
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