不同溶剂提取鱼腥草天然染料

摘要

Houttuynia cordata thumbnatural dye was used in dyeing of silk fabric. The different pH of aqueous solu-tions and different volume fractions of ethanol, ethyl acetate and methanol were used as extractants to treat houttuynia cordata thumb. The UV absorption curves of each extracts and the K/S values of silk fabrics were compared for deter-mining the optimum extractant. The FT-IR curves of silk fabric dyeing with different extraction times of houttuynia cor-data thumb were studied. The results indicated that the best pH of extraction was 9 and the optimum extractant was 40% ethanol. The extraction only for one time in order to obtain higher purity, which was beneficialto dye.%鱼腥草天然染料用于丝绸织物染色,以不同pH的水溶液和不同体积分数的乙醇、乙酸乙酯和甲醇溶液作为提取剂提取鱼腥草天然染料,对比各提取液的紫外吸收曲线和丝绸织物染色的K/S值,确定最佳提取溶剂,最后比较不同提取次数的鱼腥草染后布样的红外谱图.结果表明:提取鱼腥草天然染料的最佳pH为9左右;体积分数40%的乙醇溶液提取效果最佳;提取次数为一次,保证提取液含杂质较少,有利于上染.