【摘要】 黑粒小麦是中国近几年育成的一类新品种,其富含丰富的天然黑色素和营养价值。为了从黑粒小麦中提取天然色素并研究其理化性质,以黑粒小麦为材料,对它进行天然色素的提取及色素稳定性质进行研究。结果表明,天然黑色素易溶于水、乙醇等极性溶剂,为水溶性色素;在酸性条件下呈现红色,碱性条件下为绿色;黑粒小麦色素较耐热(<80℃);Ca2+、Ba2+、K+、Fe3+、Al3+、Cu2+、Mg2+这些金属离子对该色素都有一定的增色作用,但Ba2+、Al3+、Fe3+使其有沉淀出现;Vc、H2O2使色素色泽变浅,NaHSO3对色素有较强的褪色作用;食盐、蔗糖、柠檬酸对黑粒小麦色素有增色的作用。由此得出,黑粒小麦色素的理化性质比较稳定,是较理想的天然色素添加剂。更多还原

【Abstract】 Black-grained wheat is a new variety of wheat developed in China in recent years,and it is rich in natural melanin with highly nutritional value.In order to extract the pigment of black-grained wheat and research its physicochemical property,we extracted the pigment and research the stability of that.The results showed that,the pigment was soluble in water,ethanol and other polar solvents,while it was a kind of water-soluble pigment.And it showed red under acidic conditions,green under alkaline conditions.The black pigment of wheat grain was good heat(<80℃).Metal ions such as Ca2 +,Ba2 +,K+,Fe3 +,Al3 +,Cu2 +,Mg2 + had a certain elegance to the role of pigment,but Ba2 +,Al3 +,Fe3 + there appear to precipitate.Vc,H2O2 made the pigment color lighter,NaHSO3 fade the pigment had a strong role.Salt,sugar,citric acid on the black pigment of wheat grain had hyperchromic effect.Therefore,the physicochemical properties of the pigment of black-grained wheat were stable.The result also implied the pigment was an ideal and natural color additive.更多还原