Effects of pH and Temperature on Reaction Kinetics of Catechins in Green Tea Infusion

• DOI: 10.1271/bbb.57.907
• Publication Date: 2009-09-14T04:47:23Z
• Authors: Yoshihiro Komatsu; Shinichi Suematsu; Yoshihiro Hisanobu; Hideaki Saigo; Ryoko Matsuda; Kyoko Hara
• Keywords: Arrhenius plot; Degree Celsius

Stability of tea catechins during heat processing was examined. Effects pH and temperature on reaction kinetics degradation were investigated. Reaction – EC accelerated at higher than 6.0, inhibited those lower 5.0. A dominant in slightly acidic media isomerization. The apparent first order proceeded under sterilization conditions. similar for EC, EGC, ECg, EGCg green infusion temperatures below 95°C. turning point an Arrhenius plot observed 82°C. great difference activation energies rate constant acidified less half as much the original infusion. stability subject to temperature.