欢迎访问《生物质化学工程》,

生物质化学工程 ›› 2016, Vol. 50 ›› Issue (3): 1-7.doi: 10.3969/j.issn.1673-5854.2016.03.001

• 研究报告 •    下一篇

有机-无机溶剂连续抽提巨龙竹木质素及其结构表征

邓嘉雯1, 杨海艳1, 史正军1, 邓佳2, 郑志锋1, 辉朝茂2, 成聃睿1, 缪正调1   

  1. 1. 西南林业大学 云南省高校生物质化学炼制与合成重点实验室, 云南 昆明 650224;
    2. 西南林业大学 教育部省部共建西南山地森林资源保育与利用重点实验室, 云南 昆明 650224
  • 收稿日期:2015-11-19 出版日期:2016-05-31 发布日期:2016-06-03
  • 通讯作者: 史正军(1979-),男,副教授,硕士生导师,主要从事生物质化学与材料研究;E-mail:shizhengjun1979@163.com。 E-mail:shizhengjun1979@163.com
  • 作者简介:邓嘉雯(1993-),女,江西抚州人,硕士生,主要从事竹类研究工作
  • 基金资助:
    国家自然科学基金资助项目(31260165,31560195);云南省科技计划项目(2015FD023)

Characterization of Lignin Fractions Isolated from Dendrocalamus sinicus with Organic-inorganic Sequential Extraction

DENG Jia-wen1, YANG Hai-yan1, SHI Zheng-jun1, DENG Jia2, ZHENG Zhi-feng1, HUI Chao-mao2, CHENG Dan-rui1, MIAO Zheng-diao1   

  1. 1. University Key Laboratory of Biomass Chemical Refinery & Synthesis, Southwest Forestry University, Kunming 650224, China;
    2. Key Laboratory for Forest Resources Conservation and Use in the Southwest Mountains of China, Southwest Forestry University, Kunming 650224, China
  • Received:2015-11-19 Online:2016-05-31 Published:2016-06-03

摘要: 为了分析巨龙竹木质素的结构特征,采用有机-无机溶剂连续抽提的方式将木质素和半纤维素进行分离,脱蜡竹粉依次用80%二氧六环、80%二氧六环-0.5% NaOH、2% NaOH、5% NaOH和8% NaOH连续抽提后,得5个木质素样品L1~L5,计算了木质素得率,并对抽提所得的木质素样品进行了红外光谱(FT-IR)、紫外光谱(UV)、核磁共振碳谱(13C NMR)和二维核磁共振(2D HSQC)分析。结果表明:在二氧六环和不同浓度碱性水溶液的连续抽提下,最终从巨龙竹原料中分离得到70.6%的原本木质素,其中木质素样品L2的纯度最高,表明该方法是一种较为有效的竹材木质素组分分离方法。木质素的苯环骨架结构在分离过程中没有被破坏,但碱浓度的增加导致木质素中部分酯键发生断裂。巨龙竹木质素大分子主要由愈创木基单元(G)、紫丁香基单元(S)、对羟基苯基单元(H)组成,木质素大分子基本单元之间的联接键主要是β-O-4'醚键,除此之外还有β-β'、β-5'和β-1'联接。

关键词: 巨龙竹, 木质素, 有机-无机连续抽提, 结构表征

Abstract: In order to analyze the structural characteristics of lignin of Dendrocalamus sinicus Chia et J. L. Sun,the lignin and hemicelluloses were isolated by organic-inorganic sequential extraction.Dewaxing bamboo powder was sequentially extracted with 80% dioxane,80% dioxane-0.5% NaOH,2% NaOH aqueous,5% NaOH and 8% NaOH,respectively.Five lignin samples(L1-L5) were obtained,and the yields of lignin were caculated.The structural features of the isolated bamboo lignin fractions were characterized by FT-IR,UV,13C NMR and 2D HSQC.The analysis results indicated that 70.6% original lignin was fractionated from D. sinicus after five-step treatments,and the highest purity lignin sample was L2.This indicated this method was an effective method to isolate lignin.The structure of lignin was saved during the separation process,but a part of ester linkages were broken due to the alkaline surroundings.In addition,the lignin polymer isolated from D. sinicus consisted of guaiacyl,syringyl and p-hydroxyphenyl units.The inter-units linkages presented in the bamboo lignin including β-O-4' linkages, β-β' linkages, β-5' and β-1' linkages.

Key words: Dendrocalamus sinicus Chia et J. L. Sun, lignin, organic-inorganic sequential extraction, structural characterization

中图分类号: