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.%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.
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