STUDY ON OXIDATION MECHANISM OF GUM ROSIN UNDER HEAT

Changes in color and carbon groups of gum rosin under heat were investigated by CIE system L*a*b* and X-ray photoelectron spectroscopy(XPS).Analysis results revealed that color of rosin was related to isomerization and oxidation of rosin.Formation of hydroxyl groups through hydrolysis of epoxy groups was one of the main routes for rosin oxidation.Formation of carbonyl groups was responsible for the discoloration of rosin under heat.