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作 者 ：秦特夫

期 刊 ：林业科学 1999年 35卷 3期 页码：69-75

关键词：杉木磨木木质素；三北一号杨磨木木质素；化学官能团特征；

Keywords:Chinese fir MWL, Poplar“Sanbei”No.1 MWL, Chemical structure characteristics,

摘 要 ：本研究使用Bjrkman的提取方法,分离出针叶材杉木和阔叶材“三北”一号杨的磨木木质素(MWL),并采用Lundguist方法对分离出的MWL进行提纯。用红外光谱仪(FTIR)、超导核磁共振波谱仪(1HNMR)、液相色谱(HPLC)及紫外/可见分光光度仪(UV)测定了这两个树种MWL的化学结构和官能团。结果表明:(1)杉木木质素碳的含量较杨树高1.23%,氢和氧的含量分别低0.22%和0.85%,“三北”一号杨木质素中的甲氧基含量比杉木的高6.26%。(2)杉木和“三北”一号杨两种磨木木质素的苯基丙烷结构单元的经验式分别为C₉H_8.08O_2.46(OCH₃)_0.94和C₉H_7.86O_2.33(OCH₃)_1.41。(3)杉木磨木木质素中的脂肪族羟基(OH_aliph)和酚羟基(OH_ph)数在每C₉单元中分别是0.93和0.25,分别占总羟基的78.8%和21.2%。“三北”一号杨磨木木质素中的脂肪族羟基(OH_aliph)和酚羟基(OH_ph)数在每C₉单元中分别是1.02和0.49,分别占总羟基的67.5%和32.5%。(4)杉木与“三北”一号杨磨木木质素在210nm附近的吸收波长基本相同。但在280nm附近杨树磨木木质素的吸收波长为280.2nm,而杉木磨木木质素由于愈疮木基丙烷产生了深色化效果,使吸收波长向长波长方向移动至282.2nm。(5)杉木的红外光谱吸收峰强度具有典型的针叶材特征,“三北”一号杨磨木木质素的红外光谱吸收峰强度与温带阔叶材的特征不完全吻合。(6)杉木和“三北”一号杨磨木木质素中每C₉单元的β—O—4结构的平均质子数分别为0.33和0.50。β—5结构(苯基豆满香)中的平均H质子数量分别为0.23和0.16。β—β结构中H_α的平均质子数量分别为0.92和0.67。

Abstract:Milled wood lignins(MWL)is isolated from Chinese fir and poplar“Sanbei”No.1 wood．The lignins are characterized on the basis of FTIR，UV，HPLC，¹HNMR spectroscopy and elemental analyses． The results show that：(1)The carbon content in Chinese fir lignin is 1.23％higher than that in poplar “Sanbei”No.1 lignin，but the hydrogen and oxygen contents are respectively 0.22％and 0.85％lower than those in poplar“Sanbei”No.1 lignin．(2)The empirical formulas of C₉ are calculated for Chinese fir lignin and poplar“Sanbei”No.1 lignin as C₉H_8.08O_2.46(OCH₃)_0.94 and C₉H_7.86O_2.33(OCH₃)_1.41，respec-tively based on their nlethoxyl contents and elemental composition．(3)The OH_aliph is 78.8％in total numbets of hydroxyl groups of Chinese fir lignin，and the OH_ph is 21.2％．The OH_aliph is 67.5％and the OH_ph is 32.5％in the poplar“Sanbei”No.1，lignin．(4)The IR spectra of Chinese fir lignin shows the typicalsoftwood characteristics，but the poplar“Sanbei”No.1 is not absolutely coincident with the IR spectra characteristics for the temperate hardwoods．(5)The per-C₉-unit average proton numbers of β—O—4 structures in Chinese fir lignin and poplar“Sanbei”No.1 lignin are 0.33 and 0.50，the β-5 structures are 0.23 and 0.16，and the β-β structures are 0.92 and 0.67 respectively．

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