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《SCIENTIA SILVAE SINICAE》 1999-03
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THE CHEMICAL STRUCTURES AND CHARACTERISTICS OF THE MWLs OF CHINESE FIR ( CUNNINGHAMIA LANCEOLATA ) AND POPLAR “SANBEI” NO.1 ( POPULUS NIGRA×P.SIMONII ) WOOD

Qin Tefu (Research Institute of Wood Industry, CAF Beijing100091)  
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 C 9 are calculated for Chinese fir lignin and poplar “Sanbei” No.1 lignin as C 9H 8.08 O 2.46 (OCH 3) 0.94 and C 9H 7.86 O 2.33 (OCH 3) 1.41 , respectively based on their methoxyl contents and elemental composition. (3)The OH aliph is 78.8% in total numbers 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 typical softwood characteristics, but the poplar “Sanbei” No.1 is not absolutely coincident with the IR spectra characteristics for the temperate hardwoods. (5)The per C 9 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.
【Fund】: 国家自然科学基金
【CateGory Index】: TQ351.01
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