Study on the stability of anthocyanins of raspberry

Effect of light, temperature, pH value, food additives and metal ions on the stability of anthocyanins from red raspberry was studied. The results showed that the stability of anthocyanins decreased with the increase of temperature, and anthocyanins were stable at the temperature lower than 60℃. Anthocyanins were instable outdoor natural light, and anthocynains were stable in the dark compared with outer natural light. Anthocyanins were stable at pH1.0 and 3.0, but instable at pH5.0, 7.0 and 9.0. Sodium benzoate and sucrose increased the stability of anthocyanins, while ascorbic acid reduced the stability of anthocyanins. The Al3 + showed significant color-enhancing effect while Al3+and Ca2+had no influence on the stability of anthocyanins.