KINETIC OF CHLOROPHYLL DEGRADATION AND COLOR CHANGE IN BITTER GOURD DURING HEAT TREATMENT
Journal: International Journal of Engineering Sciences & Research Technology (IJESRT) (Vol.5, No. 4)Publication Date: 2016-04-30
Authors : Duong Thi Phuong Lien;
Page : 616-621
Keywords : Chlorophyll; bitter gourd; kinetics; color; activation energy.;
- KINETIC OF CHLOROPHYLL DEGRADATION AND COLOR CHANGE IN BITTER GOURD DURING HEAT TREATMENT
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Abstract
Thermal degradation kinetics of chlorophylls and visual green color loss in bitter gourd were investigated at 70, 80, 90 and 100°C. The loss of visual green color, as represented by the change of the ?a value and the ?a/b ratio measured by tristimulus colorimeter, All the degradation of chlorophyll a, chlorophyll b as well as visual green color loss followed a first?order reaction. The rate constants of all parameters increased with increasing temperature and followed the Arrhenius model. The activation energies for chlorophylls a and b were determined as 32.90 ± 2.68 and 49.96 ± 3.86 kJ/mol, while those for ?a value and ?a/b ratio were found as 22.75 ± 1.96 and 53.55 ± 4.08 kJ/mol, respectively
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