Comparison of several mathematical models for describing the joint effect of temperature and ph on glucanex activity

10 páginas, 5 figuras, 3 tablasThe aim of the present work was to evaluate with different statistical criteria the suitability of nine equations for describing and optimizing the simultaneous effect of temperature and pH on glucanex activity using two characteristic polysaccharides (curdlan and laminarin) as substrates. The most satisfactory solutions were found with an empirical equation constituted with parameters of practical interest (Rosso model), and a hybrid model between the Arrhenius equation and the mathematical expression generated by the protonation-hydroxylation mechanism (Tijskens model). The joint optimal values of pH and temperature calculated with the Rosso model were obtained at 4.64 and 50°C with curdlan and 4.64 and 48°C using laminarin as substrateMr. Miguel Angel Prieto Lage had two predoctoral contracts (Lucas Labrada and María Barbeito grants financed by the Xunta de Galicia). We wish to thank the CSIC (Intramural Project: 200930I183) and Xunta de Galicia (Programa de consolidación de unidades de investigación 2008-2010, IN845B-2010/004) for financial supportPeer reviewe