Determination of the degradation kinetics of anthocyanins in a model juice system using isothermal and non-isothermal methodsHarbourne, N., Jacquier, J. C., Morgan, D. J. and Lyng, J. G. (2008) Determination of the degradation kinetics of anthocyanins in a model juice system using isothermal and non-isothermal methods. Food Chemistry, 111 (1). pp. 204-208. ISSN 0308-8146 Full text not archived in this repository. It is advisable to refer to the publisher's version if you intend to cite from this work. See Guidance on citing. To link to this item DOI: 10.1016/j.foodchem.2008.03.023 Abstract/SummaryThe effect of temperature on the degradation of blackcurrant anthocyanins in a model juice system was determined over a temperature range of 4–140 °C. The thermal degradation of anthocyanins followed pseudo first-order kinetics. From 4–100 °C an isothermal method was used to determine the kinetic parameters. In order to mimic the temperature profile in retort systems, a non-isothermal method was applied to determine the kinetic parameters in the model juice over the temperature range 110–140 °C. The results from both isothermal and non-isothermal methods fit well together, indicating that the non-isothermal procedure is a reliable mathematical method to determine the kinetics of anthocyanin degradation. The reaction rate constant (k) increased from 0.16 (±0.01) × 10−3 to 9.954 (±0.004) h−1 at 4 and 140 °C, respectively. The temperature dependence of the rate of anthocyanin degradation was modelled by an extension of the Arrhenius equation, which showed a linear increase in the activation energy with temperature.
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