造纸法再造烟叶主要工艺过程中的阳离子含量

Cation content during paper-making tobacco reconstitution processes

为考察造纸法再造烟叶主要加工工序对阳离子含量(质量分数)的影响,优化了同时测定钠、铵、钾、镁和钙5种阳离子的离子色谱法的前处理条件,测定了再造烟叶原料和主要工序中5种阳离子含量。结果表明:(1)前处理优化条件为盐酸溶液浓度0.05 mol/L、超声萃取时间30 min、料液比为1∶500。(2)再造烟叶3种原料中阳离子总含量顺序为烟梗>烟末>>外加纤维(外纤),烟梗和烟末中主要阳离子为钾和钙,外纤为钠、钾和钙。(3)洗梗和浸梗工序对5种阳离子去除作用较强,钠、钾、镁、铵和钙阳离子的去除率分别为73.1%、61.1%、50.5%、50.4%和20.7%。(4)片基经涂布工序后,钙离子含量下降19.4%,其余阳离子含量均有所上升。(5)涂布后各工序样品阳离子含量基本保持稳定,变化幅度小于3.0%。

In order to investigate the effects of main production processes on selected cation contents in paper-making reconstructed tobacco, sample pretreatment conditions for the simultaneous determination of Na^＋, NH4^＋, K^＋, Mg^2＋, Ca^2＋ ions with ion chromatography were optimized. The contents of the five cations in raw materials and paper-making reconstituted tobacco were determined during the production processes. The results showed that： 1） Optimized sample pretreatment conditions were： using 0.05 mol/L hydrogen chloride to extract sample at the ratio of 1：500 under ultrasonic condition for 30 minutes. 2） The content of the total cation in the materials was ranked as： stem powder 〉 tobacco powder 〉〉 external fiber. The major cations in stem powder and tobacco powder were K^＋ and Ca^2＋, those in external fiber were K^＋, Ca^2＋ and Na^＋. 3） Cations were eliminated during the stem washing and dipping process with the reduction rate of 73.1% （Na^＋）, 61.1% （K^＋）, 50.5% （Mg^2＋）, 50.4% （NH4^＋）, 20.7% （Ca^2＋）. 4） After coating process, the content of Ca^2＋ reduced by 19.4%, while the other cations slightly increased in the base-sheet. 5） During the subsequent coating processes, the contents of cations were kept steady within 3.0% variation.