Abstract
Degradation of ascorbic acid (AA) in Zhanhua winter jujube stored at selected temperatures under continuous light and darkness conditions was described by first-order kinetics and Weibull distribution function, and the temperature dependence of AA loss was studied by the Arrhenius equation. The high correlation coefficients (R 2 > 0.99) indicated the acceptability of Weibull model for predicting the degradation of AA. Activation energy was determined to be 10.586 and 11.868 kcal/mol under continuous light condition and 12.636 and 13.190 kcal/ mol under continuous darkness condition according to first-order and Weibull models, respectively. This study revealed that the loss of AA in continuous darkness was more temperature-dependent than the other samples. In continuous light, AA degradation may be favored even if at low temperatures. Therefore, a low temperature and continuous darkness condition is recommended to preserve AA content in jujube fruits during postharvest storage.
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