Author(s)

Jingyi Xu, Mengze Du, Xiaomei Li, Qian Tang, Chunlei He, Pinwu Li

Corresponding Author

Jingyi Xu

ABSTRACT

To study the inhibitory effects of dark tea on some intestinal pathogenic bacteria and investigate the healthcare functions of dark tea, the Oxford Cup was employed to determine the antibacterial activities of water extracts from Ya’an tea, Hunan Fu brick and Yunnan Pu'er tea against two bacterial species including Staphylococcus aureus and Escherichia coli and the minimal inhibition concentrations (MICs). The results showed that the extract from three types of dark tea displayed antibacterial activity against Staphylococcus aureus and Escherichia coli. The minimum antimicrobial concentration of all hree types of dark tea was 48mg/ml to Escherichia coli. And the minimum antimicrobial concentration of Ya’an tea and Yunnan Pu'er tea was 24mg/ml to Staphylococcus aureus. However, the MIC of Hunan Fu brick was 12mg/ml. It is showed that the extract from three types of dark Tea displayed antibacterial activity on Digestive bacteria, especially Hunan Fu brick have higher antibacterial activity.

KEYWORDS

Dark tea, Staphylococcus aureus, Escherichia coli, antibacterial effect