核桃外果皮的开发利用研究（Ⅱ）——晒干、晾干、沤干的核桃外果皮中棕褐色色素的提取率与稳定性比较

将同一采样点的样品分别晒干、晾干、沤干后，以水为萃取剂，提取棕褐色色素，并对其稳定性进行了测试与比较。结果表明：由于干燥方式不同，导致提取率有差别。色素溶液的吸光度随波长增加而减小的趋势相同，色素的水溶性，耐氧化一还原性，耐光性，盐、蔗糖、金属离子对色素的色泽的影响基本相似。

Study of Exploit and using of the walnut epicarp(Ⅱ) Compare of the Stability and Extraction Quotiety of the Hydroextracting the Dark Brown Pigment from Walnut epicarp of dry in the sun and by the airing and retting

Stability testing and compare of the Hydroextracting the Dark Brown Pigment from Walnut epicarp of dry in the sun and by the airing and retting . The result showed that the pigment property sameness ,fo example ,can be better solved by H2O,reduce is stronger, activity is better,salt,C12H22O11 , lemon acid and metal iron have little effect.Our experiments showed that the methed has many advatages,Such as high extraction efficiency ,simply process, less pollution,and the cost is smoll etc.but extraction quotiety of the Dark Brown Pigment differ from Walnut epicarp of the three made of dryness.