Kinetic analysis of anthocyanin degradation and polymeric colour formation in grape juice during heating
G. Danışman, E. Arslan, A.K. Toklucuhttps://doi.org/10.17221/446/2014-CJFSCitation:Danışman G., Arslan E., Toklucu A.K. (2015): Kinetic analysis of anthocyanin degradation and polymeric colour formation in grape juice during heating. Czech J. Food Sci., 33: 103-108.
The degradation of total monomeric anthocyanins and changes in the proportion of polymeric colour (% PC) as well as antioxidant capacity of grape juice were studied during heating at 70–90°C. Anthocyanin degradation fitted to a first order reaction model, while the formation of % PC followed zero order reaction kinetics. High correlations (r = 0.989–0.997) were found between anthocyanin degradation and % PC formation during heating. The activation energies for the degradation of anthocyanins and formation of % PC were 64.89 and 50.42 kJ/mol, respectively. Trolox equivalents antioxidant capacity (TEAC) values of grape juice slightly changed during heating.Keywords:red grape, monomeric anthocyanins, thermal processing, reaction kinetics; antioxidant activityReferences:
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