Inhibition of nitrosification by anthocyanins from purple sweet potato

The effect of nitrite scavenging and synthesis blocking of N-nitrosamines by anthocyanins from purple sweet potato were studied. The results showed that the concentration of anthocyanins with scavenging rate and blocking rate showed a good dose-effect relationship. The higher the concentration of anthocyanins,the stronger the scavenging ability on nitrite and inhibiting on nitrosylation reaction was. The blocking rate was higher than scavenging rate under p H3.0 buffer solution,but the scavenging rate was higher than blocking rate under the simulated gastric juice. Under three reaction conditions,the highest scavenging rate of nitrite were 97.23%、95.05%、91.72% respectively and the highest nitrosamine synthesis blocking rate was 99.28%、92.62%、88.50%,respectively. The best reaction condition was under p H3.0 buffer solution.