Changes in the color, chemical stability and antioxidant capacity of thermally treated anthocyanin aqueous solution over storage

Many anthocyanin-containing foods are thermally processed to ensure their safety, and stored for some time before being consumed. However, the combination of thermal processing and subsequent storage has a significant impact on anthocyanins. This study aimed to investigate the color, chemical stability, and antioxidant capacity of thermally treated anthocyanin aqueous solutions during storage at 4, 25, 45, and 65 degrees C, respectively. Anthocyanin aqueous solutions were thermally treated before storage. Results showed that the degradation rate of anthocyanins in aqueous solutions was much faster than those in real food. The color of the anthocy-anin aqueous solutions changed dramatically during storage. The anthocyanin aqueous solutions stored at 4 degrees C showed the best chemical stability. Interestingly, the antioxidant capacity of the anthocyanin aqueous solutions stored at lower temperatures remained the same; however, the antioxidant capacity of those thermally treated at 120 or 140 degrees C and stored at 45 or 65 degrees C significantly decreased. (C) 2015 Elsevier Ltd. All rights reserved.