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Use of Linear and W eibull Functions to Model Ascorbic Acid Degradation in C hinese Winter Jujube during Postharvest Storage in Light and Dark Conditions
Author(s) -
Jiang Lingling,
Zheng Hong,
Lu Hongfei
Publication year - 2014
Publication title -
journal of food processing and preservation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.511
H-Index - 48
eISSN - 1745-4549
pISSN - 0145-8892
DOI - 10.1111/jfpp.12040
Subject(s) - postharvest , darkness , ascorbic acid , weibull distribution , arrhenius equation , degradation (telecommunications) , activation energy , kinetics , humidity , chemistry , horticulture , botany , food science , mathematics , thermodynamics , biology , physics , statistics , organic chemistry , computer science , telecommunications , quantum mechanics
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 W eibull 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 W eibull 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 W eibull 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. Practical Applications This paper described the degradation of ascorbic acid ( AA ) of Chinese winter jujube during storage under different temperatures and continuous light and darkness conditions using first‐order kinetics and W eibull distribution function. The results showed that the degradation of AA during storage was well described by the W eibull distribution function, and a low temperature and continuous darkness condition was preferred to preserve AA . Results of this study will contribute to preserving AA content in jujube and other fruits during postharvest storage.