Dynamic models of Lingzao VC content changes during storage at different storage temperatures

The VCchanges in jujube fruits( Zizyphus jujube Mill. cv. Lingzao) during storage at 0,4,10,20 ℃,respectively,were investigated to find a mathematical way to quantitatively predict its changes. Zero- and first-order kinetics models and a model based on Weibull distribution were firstly employed to fit the experimental data.Values of R2adj、RMSE、χ2、AIC and concrete model parameters for each model were calculated from the experimental data to evaluate the model suitability.A rate constant- temperature model Y = ln( 1 + exp[c( T- Tc) ])was then applied to figure out the relationship between the caltulated rate parameter and storage temperature.Results showed that Weibull model fitted best for all storage temperatures since it had R2 adjvalues closest to 1 and the lowest RMSE and χ2values.According to Akaike's Information Criteria,Weibull model was more appropriate to predict Vcchanges during storage than the other two at 0,4 and 10 ℃ while first order kinetic model performed the best in the 20 ℃ situation. R2 adjvalue of the rate constant- temperature model was 0.9894 indicating that it was appropriate for its application in the estimation of rate constant of Weibull model for a known temperature.