田基黄色素的提取及其稳定性

目的:探讨不同溶剂提取田基黄色素的方法,并考察各种因素对色素稳定性的影响.方法:采用6种不同溶剂提取色素,测试pH、温度、光熙、还原剂及氧化剂等因素对色素稳定性的影响.结果:田基黄色素用95％乙醇30℃超声提取10 min效果最佳,该色素在光照、强酸碱性、Mg2+、Al3+等条件下不稳定,食品添加剂、还原剂、氧化剂对色素的稳定性影响不大.结论:该色素具有较好稳定性,但须防止光照,避免酸碱性条件下使用.田基黄色素可作为一种较好的天然植物色素资源.

Extraction and Stability of Pigment from Hypericum japonicum

Objective:To investigate extraction methods of pigment from Hypericum japonicum by different solvents,and investigate effects of different factors on stability of pigment.Method: Pigment was extracted with 6 different solvents,stability of pigment was tested with pH,temperature,light,reducing agents and oxidants.Result: Extraction effect of pigment was optimum by ultrasonic extraction 10 min with 95% ethanol at 30 ℃,These pigment was unstable in light,strong acidity and alkaline,metal ions of Mg2+,Al3+ and other conditions.Food additives,reducing agents and oxidants had little effect on stability of pigment.Conclusion: These pigment had good stability,but it must prevent pigment using in light and avoid acidity and alkaline condition.Pigment from H.japonicum could be used as a good resource of natural plant pigment.