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研究高纯二氢杨梅素(DMY)的结晶方法及主要“杂质”杨梅素(MY)的动态变化。以藤茶粗提物为原料,二氢杨梅素的色泽、产量和纯度为评价指标,考察单一溶剂、复合溶剂、水-10%乙醇及水-10%乙醇(氮气保护)结晶中杨梅素对二氢杨梅素结晶效果的影响。结果表明:藤茶粗提物经水重结晶三次和在氮气保护下10%乙醇重结晶五次,二氢杨梅素的纯度从63.18%提高到98.06%,产率为14.60%;杨梅素含量从3.23%降低为0.85%。在二氢杨梅素分段结晶过程中,水有利于除掉杨梅素以外的杂质,10%的乙醇有利于除掉杨梅素;氮气保护可有效减缓高纯二氢杨梅素的氧化速度。
The crystallization of high purity dihydromyricetin (DMY) and the dynamic changes of the main “impurity” myricetin (MY) were studied. The crude extract of cane tea was used as raw material, and the color, yield and purity of dihydromyricetin were evaluated. The effects of myricetin on single crystal, compound solvent, water - 10% ethanol and water - 10% ethanol The Effect of Dihydromyricetin Crystallization. The results showed that the crude extract of Tengcha was recrystallized three times by water and recrystallized 10% ethanol under the protection of nitrogen five times. The purity of dihydromyricetin increased from 63.18% to 98.06% with the yield of 14.60% 3.23% down to 0.85%. During the segmented crystallization of dihydromyricetin, water is good for removing impurities other than myricetin, and 10% ethanol is good for removing myricetin. Nitrogen protection can effectively slow down the oxidation rate of high purity dihydromyricetin.