The fermentation liquid of black tea bacteria is a tea drink made from the fermentation of tea sugar water, and the membrane of black tea bacteria is a symbica of bacteria, yeast and fungi. The fermentation liquid composition of black tea bacteria is more complex, and the antibacterial effect of K-A black tea bacteria fermentation liquid on Grain-positive bacteria and Gluclan-negative bacteria was tested by paper chip method and Oxford cup method. Antibacterial activity is mainly provided by organic acids and a heat-sensitive substance. The study also found significant differences in fermentation characteristics between K-A black tea bacteria and K-H black tea bacteria from different sources. ...
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