水杨酸酰化对胭脂萝卜天竺葵素稳定性和抗氧化活性的影响

为探究水杨酸作为酰化剂对胭脂萝卜天竺葵素的稳定性和抗氧化活性的影响,以保留率为指标,分析光、温度、金属离子、pH及氧化剂对酰化天竺葵素稳定性的影响,探究酰化天竺葵素对羟自由基、DPPH自由基和ABTS自由基的清除能力。结果表明:酰化天竺葵素对光、温度、Al3+、pH的稳定性显著提高,对Fe2+、Mg2+和Zn2+以及氧化剂H2O2的稳定性无显著差影响。酰化天竺葵素对羟自由基、DPPH自由基和ABTS自由基的清除能力与未酰化天竺葵素无显著差异。以上结果表明采用水杨酸酰化胭脂萝卜天竺葵素不影响其抗氧化活性,还能提高其对光照、温度、pH及铝离子的稳定性。

Stability and antioxidant activity of salicylate acylated pelargonidin from carmine radish

To explore the stability and antioxidant activity of carmine radish pelargonidin which acylated by salicylic acid,retention rate taken as the index,a series of element have taken to analyzed such as light,temperature,metal ions,pH and H2O2.To demonstrate the scavenging ability of acylated pelargonidin,hydroxyl,DPPH and ABTS radicals had been detected.The results showed that the stability of acylated pelargonium was significantly improved in light,temperature,Al3+ and pH,but remaimed no significant difference in Fe2+,Mg2+,Zn2+ and H2O2.The scavenging capacity of acylated pelargonium on hydroxyl,DPPH and ABTS free radicals was no significantly different from that of normal pelargonium.These results indicated that acylation had no impact on the antioxidant activity of pelargonium,but also improved its stability to light temperature,Al3+ and pH.