PROBLEM TO BE SOLVED: To provide a fermentation method capable of stably producing useful substances over a long period without causing microorganismal effluence with no concern of miscellaneous germs contamination.SOLUTION: The objective fermentation method is capable of stably producing useful substances over a long period by using agglomerates obtained by cocultivation of yeast and bacteriocin-producing lactobacillus without concern miscellaneous germs contamination nor microorganismal effluence.
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