氢氧化钠—尿素法测定烟草木质素预处理方法的优化
摘要[目的]优化氢氧化钠-尿素法（NU法）测定烟草木质素含量的预处理方法。[方法]分别用中性洗涤剂和氢氧化钠-尿素溶液对烟梗、烟叶碎片（烟片）、烟叶碎末（烟末）进行预处理，分析比较了2种溶液对干扰物的去除效果，并对2种预处理方法下NU法的测定结果进行了对比评价。[结果]中性洗涤剂对烟梗、烟片、烟末的干扰物去除率近80%，比氢氧化钠-尿素溶液提高13%～16%；在中性洗涤预处理方法下，NU法测得3种烟草样品的木质素含量大小关系为烟梗>烟片>烟末，与氢氧化钠-尿素预处理下的测定结果恰恰相反；预处理方法优化后NU法的精密度为2.03%，满足检测需求。[结论]研究可为烟草木质素含量测定的预处理方法优化提供参考。
关键词氢氧化钠-尿素法；烟草木质素；预处理方法优化；中性洗涤剂；氢氧化钠-尿素溶液
中图分类号TS41文献标识码
A文章编号0517-6611（2017）16-0091-03
Pretreatment Optimization of NaOH/Urea Method Used for Content Determination of Lignin in Tobacco
ZANG Fukun，LI Xinsheng，YAN Xinlong（Technology Center，Taicang Haiyan Reconstituted Tobacco Co.Ltd.of Shanghai Tobacco Group，Taicang，Jiangsu 215433）
Abstract[Objective] To optimize the pretreatment method of NaOH/Urea method used for content determination of lignin in tobacco.[Method] Tobacco stems，scraps and dusts were pretreated with neutral detergent and NaOH/Urea solution respectively，then both the interfering substances removal rates and the content results determined by NaOH/Urea method under each pretreatment method were compared.[Result] The results showed that： Neutral detergent could remove interfering substances in tobacco stems，scraps and dusts by about 80%，which is 13%-16% higher than that of NaOH/Urea solution； The order of lignin content determined by NaOH/Urea method under neutral detergent pretreatment was tobacco stems > scraps > dusts，which was right opposite from that under NaOH/Urea pretreatment； the precision of NaOH/Urea method after pretreatment op...
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