versão On-line ISSN 0718-0764
MENDOZA, Rolando e HERRERA, Aníbal O. Kinetics of Peroxidase Enzyme Inactivation, Color and Texture in Golden Potato (Solanum tuberosum phureja group) under three Blanching Conditions. Inf. tecnol. [online]. 2012, vol.23, n.4, pp. 73-82. ISSN 0718-0764. http://dx.doi.org/10.4067/S0718-07642012000400009.
The objective of this work was to determine the inactivation kinetics of peroxidase enzyme and the change in color and texture in golden potato tubers (Solanum tuberosum phureja group) exposed to blanching with water at 80°C, 90°C and to saturated steam at 93°C. The heat transfer coefficients for the blanch water ranged between 214 and 230 W °C-1 m-2 while for saturated steam they showed an average of 84.5 W °C-1 m-2. At different pre-cooking times the golden potato tuber showed an area that developed enzymatic browning, which was fitted to the Michaelis-Menten kinetic model and another area where the color change decreased due to enzyme inactivation, which corresponded to first order kinetics, in a similar way as the texture behavior. The inactivation of peroxidase enzyme followed the Lumry-Eyring mechanism.
Palavras-chave : process modeling; Solanum tuberosum phureja group; instrumental color; texture; peroxidase.