板栗壳棕色素的提取及其相关性质研究

以乙醇作溶剂,用一次浸提法从板栗壳中提取天然棕色素.正交试验结果表明:提取时间2.5 h、浸提温度75℃、乙醇浓度40%、固液比1:20(g:mL)时,棕色素的提取率较高,为5.52%.对相关性质进行测定表明:所得棕色素溶于水、乙醇、甲醇,不溶于苯、丙酮、乙酸乙酯等溶液;PH值对棕色素影响不明显;棕色素水溶液有较好的耐光性耐热性及较好的抗氧化性抗还原性;金属离子Ca2+、Mg2+、Zn2+、Ba2+、Na+、K+对色素的颜色无明显影响,但金属离子Fe3+、Pb2+、Cu2+会与色素反应生成沉淀并褪色.

Study on the extraction of brown pigment from chestnut shell and its related properties

The extraction of natural brown pigment from chestnut shell by ethanol was studied. The optimal conditions through the orthogonal test were found as follows: the extraction time 2.5 h, extraction temperature 75℃, the ethanol concentration 40%, solidliquid ratio 1 : 20. The extraction rate of brown pigment was 5.52%. In addition, the result of the study of its related properties showed: brown pigment was soluble in water, ethanol, methanol and insoluble in benzene, acetone, ethyl acetate, etc; brown pigment in aqueous solution was good at light and heat resistance, anti-oxidation and anti-reducibility; metal ions such as Ca2+, Mg2+, Zn2+, Ba2+, Na+, K+ didn't affect the pigment color significantly. However, Fe3+, Pb2+, Cu2+ could react with the pigment with sedimentation and decolored appeared.