Thermal and storage stabilities of anthocyanins in blackberry (Rubus fruticosus L.) juice and concentrate were studied over the temperature
range 60–90 C and 5–37 C. Results indicate that the thermal degradation of anthocyanins followed first-order reaction kinetics.
The temperature-dependent degradation was adequately modeled on the Arrhenius equation. The activation energy value for the
degradation of blackberry anthocyanins during heating was 58.95 kJ/mol for the 8.90Brix blackberry juice. During storage, antocyanins
in the 65.0Brix blackberry juice concentrate degraded more rapidly than that in 8.90Brix blackberry juice, with the activation energies
of 65.06 kJ/mol and 75.5 kJ/mol, respectively.
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