Abstract
The degradation of (+)-catechin in an oil-in-water emulsion using methyl dodecanate as an oil phase with or without ascorbic acid or acyl ascorbate was kinetically examined at 40 °C. The rate constant, k, of the first-order kinetics for the degradation with ascorbic acid or octanoyl ascorbate depended on the added amount, whereas the k value with hexadecanoyl ascorbate was independent of the amount. The k value for a smaller oil droplet with each ascorbate was lower than that for a larger oil droplet. Catechin did not partition well into the methyl dodecanate phase, but did adsorb slightly onto the interface between the methyl dodecanate and water. The suppressive effect of acyl ascorbate on the catechin degradation in the emulsion was lower than that of hydrophilic ascorbic acid at the low concentration, but the peroxidative ability also was lower. Most of the catechin molecules in the emulsion degraded in the water phase. The catechin degradation in the emulsion with small oil droplets depended on the acyl chain length of the ascorbates more than in large oil droplets.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
