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http://dx.doi.org/10.3746/jkfn.2016.45.12.1838

Bioactivity and Cytotoxicity of Kombucha Fermented with Extracts from Green Tea and Citrus Peel  

Shin, Seung-Shick (Department of Food Science & Nutrition, Jeju National University)
Ko, Hye-Myoung (Department of Food Science & Nutrition, Jeju National University)
Kim, Chung-I (Department of Food Science & Nutrition, Jeju National University)
Park, Sung-Soo (Department of Food Science & Nutrition, Jeju National University)
Publication Information
Journal of the Korean Society of Food Science and Nutrition / v.45, no.12, 2016 , pp. 1838-1842 More about this Journal
Abstract
Kombucha (K) is a fermented beverage made from black tea by symbiotic micro-organisms of bacteria and yeasts. To enhance bio-activities of K, we produced citrus/green tea Kombucha (CK) by adding extracts of citrus peel and green tea obtained from Jeju Island. ORAC assays showed that anti-oxidative capacity of CK increased by approximately 3-folds compared to K. We examined anti-cancer properties of extracts from citrus peel and/or green tea using 5637 human bladder cancer cells and B16F10 murine melanoma cells. Proliferation of B16F10 cells was markedly inhibited at concentrations higher than $10{\mu}L/mL$. At a concentration of $20{\mu}L/mL$, anti-cancer activities of extracts were in the order of citrus peel< green tea< combination of both. Interestingly, a combination of both extracts showed a synergistic effect on inhibition of growth of cancer cells. CK fermented with citrus peel and green tea extracts showed enhanced anti-cancer activity compared to K. Cytotoxicity of CK on RAW 264.7 murine macrophages was negligible up to $100{\mu}L/mL$. Taken together, these results indicate that citrus Kombucha is safe to be developed as a functional beverage.
Keywords
citrus Kombucha; ORAC; bladder cancer; melanoma;
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