Aspergillus ochraceus spores inactivation with high-pressure carbon dioxide

作者：Neagu Corina; Borda Daniela^*; Erkmen Osman

来源：Romanian Biotechnological Letters, 2013, 18(5): 8573-8582.

• supercritical carbon dioxide
• inactivation
• mould
• kinetics
• thermodynamics

The aim of this research was to study the inactivation of Aspergillus ochraceus spores exposed to high pressure carbon dioxide (HPCD) treatments and to estimate the kinetic and the thermodynamic parameters. A synergistic effect of pressure and temperature was noticed in the range from 5.4 to 7 MPa and from 30 to 50 degrees C. Weibull model is the best primary kinetic model to describe the inactivation of A. ochraceus in the range from 5.4 to 7 MPa and from 30 to 50 degrees C. The statistical indices show better correlations between the experimental and the predicted values for Weibull equation compared with Gompertz and Logistic models. The values of enthalpy, enthropy and total free energy were estimated for the experimental domain using nonlinear regression analysis. There was no significant variation in the values of the Gibbs free energy for the experimental domain. This work contributes to the general understanding of mould inactivation using high pressure carbon dioxide (HPCD) treatment.

• 出版日期2013-10