摘要
为了解芦荟色素的提取方法、色素的稳定性,以及开发应用的可能性,本试验研究了芦荟绿色素的最佳提取方法和理化性质,氧化剂、还原剂金属离子等对芦荟绿色素的理化性质的影响。试验结果表明,以95%乙醇溶剂作为提取剂,料液配比为1∶50,提取温度为45℃,提取时间为1.5 h是提取芦荟绿色素的最佳工艺条件。p H=8时色素颜色最深。50℃以下的温度对色素颜色影响不大;60℃以上时色素颜色下降较快。在室温下贮藏,色素的颜色会慢慢下降。色素对光照不稳定,照光时色素颜色逐渐变浅。过氧化氢和氯酸钾可氧化色素,使色素颜色降低。还原剂维生素C和亚硫酸钠的存在可使色素颜色变浅。Cu2+和K+对色素的颜色没有影响;而Fe2+和Zn2+的存在可使色素的颜色下降。试验结果证明,芦荟的绿色素在常温下较稳定,但氧化剂和还原剂对该色素的颜色有破坏作用。
In order to comprehensively understand the extraction methods, pigment stability, and the probability of application, the chlorophyll of Aloe vera var chinensis was detailedly investigated. Several organic solvents were used as extractants. Hydrogen peroxide and potassium chlorate were used to be oxidizing agents. Vitamin C and sodium sulfite were used as reducing agents to approach the extracting methods and the stability of the pigment. It was indicated that the optimal technological conditions for extracting the green pigment were 95 % ethanol as extractant, material and liquid ratio 1∶50, extracting temperature 45 ℃, extracting time 1.5 h. The color of the pigment was the deepest at p H=8. The temperature less than 50 ℃ did not influence the color of the pigment. But the temperature higher than 60 ℃ could reduce the color of the pigment. The color of the pigment could decline when stored at room temperature. The pigment was not stable at illumination. The color of the pigment shallowed gradually under illumination. Hydrogen peroxide and potassium chlorate could oxidize the pigment to reduce the color. The reductant vitamin C and sodium sulfite could make the color shallow. Cu2＋ and K＋ did not influence the color. But Fe2＋ and Zn2＋ could make the color of the pigment shallow. It was indicated by the results that the chlorophyll of Aloe vera var chinensis was stable under the room temperature. The oxidizing agents and the reducing agents could destruct the color of the pigment.
出处
《广东化工》
CAS
2015年第15期82-85,共4页
Guangdong Chemical Industry
关键词
芦荟
叶绿素
提取
稳定性
Aloe vera var chinensis
chlorophyll
extraction
stability
