Effect of temperature and pH on the extraction equilibrium of catechins
The coefficients of ethyl acetate-water of tea polyphenol were measured by shake-flask-spectrophotometric method at different temperature and different pH. The results show that the partition coefficients are changed large with different temperature and pH, the partition coefficient of 285.15K and pH4.6 is 2.23 times as large as the ones of 313.15K and pH6.0. Tea polyphenol can be extracted more effective at low temperature and pH4.6.