Effects of Heat Treatment on Stability and Hydroxyl Radical Scavenging Activity of Red Pitaya Pigment
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Abstract:
The effects of isoascorbic acid, citric acid, and sodium hexametaphosphate on heat stability and hydroxyl radical scavenging activity of red pitaya pigment were studied and the results showed that isoascorbic acid and citric acid were not efficient in protecting pigment from heat degrading, while sodium hexametaphosphate can effectively inhibit pigment from decoloring during heat treatment. The hydroxyl radical scavenging activity of betacyanins was relative stable at pH 3.0~6.0, but decreases at pH 2.0. Heat treatment of the pigment at 90℃for 10 min remarkably reduced its radical scavenging activity up to 50% and this reducing effect increased with decreasing pH. The results also showed that there was some dependence between the heat degrading stability and hydroxyl radical scavenging activity of the pigment.
