DETERMINATION OF PHENOLIC HYDROXYL CONTENT OF LIGNIN PREPARATIONS BY ULTRAVIOLET SPECTROPHOTOMETRY
DETERMINATION OF PHENOLIC HYDROXYL CONTENT OF LIGNIN PREPARATIONS BY ULTRAVIOLET SPECTROPHOTOMETRY
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DOI：
10.1021/ac60093a009
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发表时间：
1954-01-01
影响因子：
7.4
通讯作者：
GOLDSCHMID, O
中科院分区：
文献类型：
--
作者：
GOLDSCHMID, O
人们对木质素利用的兴趣与日俱增，促使人们开发了一种简单、快速的方法来测定木质素制剂中的酚羟基。本方法基于酚类化合物在碱性溶液中的紫外吸收特性。样品的碱性溶液的吸光度直接与同一溶液的中和部分的吸光度进行测量。样品的苯酚含量是根据所得到的差值曲线的最大吸光度和以相同方式确定的模型酚的摩尔吸光系数最大值来计算的。对大量针叶木素制剂的实验结果表明，该方法适用于工业木素制剂的常规应用。
Growing interest in the utilization of lignin prompted the development of a simple and rapid method for the determination of phenolic hydroxyl groups in lignin preparations. The present method is based upon the characteristic ultraviolet absorption of phenols in alka-line solution. The absorbance of an alkaline solution of the sample is measured directly against that of a neutralized portion of the same solution. The phenol content of the sample is calculated from the absorp-tivity maximum of the resulting difference curve and the molar absorptivity maximum of model phenols determined in the same manner. Results obtained with a number of softwood lignin preparations indicate that the method is suitable for routine application to technical lignin preparations.