摘要
Cyanidin-3-glucoside, cyanidin-3-（6′′-malonyl）-glucoside, and cyanidin-3-glucoside-derived pyranoanthocyanins which were three major anthocyanins of blood orange, were obtained using a Toyopearl TSK HW-40S column chromatography. Then, thermal degradation kinetics of the three major anthocyanins was studied at selected temperatures （70, 80, and 90°C）. Degradation parameters such as k and t1/2 values were determined. The activation energy （Ea） values for cyanidin- 3-glucoside, cyanidin-3-（6′′-malonyl）-glucoside and cyanidin-3-glucoside-derived pyranoanthocyanin were 75.4, 79.5, and 81.7 kJ mol-1, respectively. Ea values suggested that cyanidin-3-glucoside-derived pyranoanthocyanin had the highest stability, followed by cyanidin-3-（6′′-malonyl）-glucoside and cyanidin-3-glucoside. However, t1/2 values indicated cyanidin- 3-glucoside-derived pyranoanthocyanin degraded faster than cyanidin-3-（6′′-malonyl）-glucoside and cyanidin-3-glucoside at selected temperature.
Cyanidin-3-glucoside, cyanidin-3-（6′′-malonyl）-glucoside, and cyanidin-3-glucoside-derived pyranoanthocyanins which were three major anthocyanins of blood orange, were obtained using a Toyopearl TSK HW-40S column chromatography. Then, thermal degradation kinetics of the three major anthocyanins was studied at selected temperatures （70, 80, and 90°C）. Degradation parameters such as k and t1/2 values were determined. The activation energy （Ea） values for cyanidin- 3-glucoside, cyanidin-3-（6′′-malonyl）-glucoside and cyanidin-3-glucoside-derived pyranoanthocyanin were 75.4, 79.5, and 81.7 kJ mol-1, respectively. Ea values suggested that cyanidin-3-glucoside-derived pyranoanthocyanin had the highest stability, followed by cyanidin-3-（6′′-malonyl）-glucoside and cyanidin-3-glucoside. However, t1/2 values indicated cyanidin- 3-glucoside-derived pyranoanthocyanin degraded faster than cyanidin-3-（6′′-malonyl）-glucoside and cyanidin-3-glucoside at selected temperature.
基金
funded by the Natural Science Foundation of Hubei Province, China(2006ABA168)
