Green tea catechins can undergo degradation, oxidation, epimerization and polymerization during food
processing.Many factors could contribute to the chemical changes of green tea catechins, such as temperature,pH
of the system, oxygen availability, the presence of metal ions as well as the ingredients added. Several detection
methods have been developed for tea catechin analysis, which are largely based on liquid chromatography (LC)
and capillary electrophoresis (CE)methods for getting a good separation, identification and quantification of the
catechins. Stability of green tea catechins is also influenced by storage conditions such as temperature and relative
humidity. The stability of each catechin varies in different food systems and products. Pseudo first-order kinetic
model has been developed and validated for the epimerization and degradation of tea catechins in several food
systems, whereas the rate constant of reaction kinetics followed Arrhenius equation.