【摘要】 本文以黑米为原料,研究了提取剂的种类、浓度、温度、pH与提取时间等因素对提取率的影响。结果表明以70%的乙醇溶液(pH2),在70℃每次提取90min提取率最高。对粗品用再沉淀方法进行了精制。由紫外光谱和红外光谱推测黑米黑色素可能属于吲哚型和邻苯二酚型混合黑色素。更多还原

【Abstract】 In this work the black kerneled rice was used as raw maternal to extract melanin. The influence of the extraction agent kind, extraction agent concentration, temperature, pH and extraction time on the melanin extraction efficiency were investigated. The results showed that the optimum conditions in extraction were that the melanin was extracted with 70% alcohol (pH2) at 70℃ for 90min each step. The raw product was refined in re-settlement. The yield rate of the refined product was1.4%. The ultraviolet spectrum of the melanin indicates that the wave length of the maximum absorption is 220nm. It is proposed that the melanin in black kerneled rice might be consisted of enmelanin and pheomelanin with reference to the infrared spectra.更多还原