核交换法对禾草类木质素结构的研究  

A study on the structure of wheat straw lignin by nuclear exchange method

作　　者：薛菁雯[1] 何伟[1] 邰瓞生[1] 李忠正[1] 

机构地区：[1]南京林业大学化工学院,南京210037

出　　处：《纤维素科学与技术》1997年第4期33-38,共6页Journal of Cellulose Science and Technology

基　　金：中国科学院广州化学所纤维素化学开放实验室基金;国家自然科学基金

摘　　要：本文采用核交换法对麦草粉、Nkny－HCHO－AQ（SFP－AQ）浆、NaOH—Na2SO3一AQ（ASP—AQ）浆和NaOH—AQ（AP—AQ）浆中残余木质素的化学结构特性进行了研究。通过核交换法结合硝基苯氧化反应，测定麦草原本木质素和浆中残余本质素的各类型酚核的数量。结果表明麦草原本木质素主要由25．35mol％非缩聚G单元，17．60mol％非缩聚S单元和57．05mol％缩聚G单元所组成。与AP—AQ浆相比，SFP浆含有较少的DPM结构单元，这可能是SFP浆漂白性能好的原因之一。Nuclear exchange reaction was amployed to study the lighn structures in the wheat straw meal, SFP-AQ (Na2SO3-HCHO-AQ) pulp, ASP-AQ (NaOH-Na2SO3-AQ) pulp, and AP-AQ (NaOH-AQ) pulp. The type of phenyl nuclei of G and S units in the original and the residual lignins of wheat straw wtre quantitatively analyzed through nuclear exchange reaction and alkaline nitrobensene oxidation. Results showed that the G and S units of wheat straw lignin were composed of 25 .35 mol% non-condeed G unit, 17.60mol% noncondensed S unit arid 57. 05 mol% condeed G unit. The residtal lighn in SFP pulp was found to have less DPM structural units. which Inay be one of the reasons that SFP pulp has better bleachability.

关 键 词：核交换反应 麦草 木质素 化学结构 植物纤维 

分 类 号：TQ353.425[化学工程] TQ351.377