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报道了采用索氏提取器从桦树皮中连续提取桦木脑的一种新方法，收率２３％。产品经ｍ．ｐ、ＩＲ及元素分析测定结果与标准品一致。
A new method of continuous extraction of birch brain from birch bark using a Soxhlet extractor was reported in a yield of 23%. Products by m. The results of p, IR and elemental analysis are consistent with those of standard samples.