Abstract
According to fractal-like theory in the heterogeneous system, a cellulase-catalyzed kinetic equation that contained two parameters (rate constant k and fractal dimension h) was deduced. The equation described directly the mathematical relationship between reducing sugar concentration and hydrolytic time, and accurately fitted the experimental data of free/immobilized cellulase at 37, 40, 44, 47, and 50 °C (R 2 > 0.99). The fitted h value is estimated as a constant (0.6148) in these tested temperatures. The fitted k value increased with temperature increase, and the relationship agreed with Arrhenius equation (R 2 > 0.98). The fractal-like equation could predict accurately the experimental data at low temperature 34 °C for free/immobilized cellulase and high temperature 53 °C for immobilized cellulase, but the prediction at 53 °C for free cellulase was not accurate enough due to its lower stability than immobilized cellulase. The application of fractal-like theory in cellulase kinetics is successful.
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This work was funded by the Knowledge Innovation Program of the Chinese Academy of Sciences (KSCX-YW-11-A3) and National Key Technology R&D Program (2011BAD22B01).
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Zhang, Y., Xu, JL., Qi, W. et al. A Fractal-Like Kinetic Equation to Investigate Temperature Effect on Cellulose Hydrolysis by Free and Immobilized Cellulase. Appl Biochem Biotechnol 168, 144–153 (2012). https://doi.org/10.1007/s12010-011-9362-4
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DOI: https://doi.org/10.1007/s12010-011-9362-4