摘要
该文以落叶松树皮为原料,采用含水乙醇提取、分离、干燥等步骤,制备了醇溶性红色素,并对该色素的理化性质和稳定性进行了系统研究.结果表明:色素的产率为6.29%,色素溶液具有原花色素的UV特征吸收光谱,分别在紫外光谱λmax为225～278 nm范围内有强吸收,在550、577 nm处有可见吸收峰.该色素的色价大于250,易溶于甲醇、乙醇、丙酮以及它们的含水溶剂.色素溶液在含水乙醇中稳定,在pH 3～8的酸性与弱碱性环境中较为稳定,日光照射不会引起色素溶液褪色,在低于100℃下、加热1 h之内,色素溶液颜色无明显变化.常见的无机离子如Ca2+、Ba2+、Na+、Mg2+、Cl-、SO42-等对色素溶液影响不明显,但Fe2+、Fe3+、Al3+会引起颜色发生较大改变.添加糖或浓度低于5%的酸和食盐等常用食品成分后,色素溶液颜色保持稳定.
The ethanol-soluble proanthocyanidin red pigment was prepared from raw material of the bark of Larix gmelini. The red pigment was extraeted by using 70% EtOH, and then the extract was purified by using petroleum ether. The yield of the pigment reached 6.29 %. Using the pigment as the experimental material, its ehemieal and physieal characteristics and the effects of light, hot, aeid, alkalis on its stabitity were studied. The results showed that it had characteristic absorption spectrum similar with proanthoeyanidin between 255-278 nm and at 550 and 577 nm. It was soluble in polarity solvent such as methanol and alcohol, and its eolour value was higher than 250. The eolour of the pigment was bright red when pH was 3-8 as well as in sun light. The pigment was stable in different concentrations of ethanol, also when it was heated for 1 h below 100℃. The stability of the pigment was influeneed by Fe^2＋ , Fe^3＋ and Al^3＋ , but not by Ca^2＋ , Ba^2＋ , Na^＋ , Mg^2＋ , Cl^- , SO4^2- .
出处
《北京林业大学学报》
CAS
CSCD
北大核心
2005年第6期67-70,共4页
Journal of Beijing Forestry University
基金
四川省重点科学技术研究项目(01ZQ052--52)
关键词
落叶松树皮
原花色素
天然红色素
稳定性
bark of Larix gmelini
natural red pigment
proanthocyanidin
stability
