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首页> 外文期刊>Journal of Wood Chemistry and Technology >LIGNIN AND OTHER AROMATIC SUBSTANCES RELEASED FROM SPRUCE WOOD DURING PRESSURIZED HOT-WATER EXTRACTION, PART 1: EXTRACTION, FRACTIONATION AND PHYSICO-CHEMICAL CHARACTERIZATION
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LIGNIN AND OTHER AROMATIC SUBSTANCES RELEASED FROM SPRUCE WOOD DURING PRESSURIZED HOT-WATER EXTRACTION, PART 1: EXTRACTION, FRACTIONATION AND PHYSICO-CHEMICAL CHARACTERIZATION

机译：云杉木材在加压热水提取过程中释放的木质素和其他芳香物质，第1部分：提取，分馏和物理化学特性

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Ground spruce wood was extracted with pressurized hot water in an accelerated solvent extractor (ASE) at 170 degrees C during 20, 60, and 100 min. Released aromatic substances (from 2.2 to 2.5% on wood basis) were isolated on XAD-7 resin and fractionated into lignin, oligomeric aromatic substances (OAS), and compounds insoluble in methanol (IMC). The separated aromatic fractions, and the ground wood before and after extraction, were characterized by physico-chemical methods (GC, GC-MS, HPLC-SEC, TG, DSC). The major part of the aromatic substances was oligomeric aromatic substances (OAS). This fraction increased significantly with the extraction time, while the yield of dissolved lignin increased only slightly with extraction time. Isolated lignins had a lower molar mass and differed considerably from spruce milled wood lignin (MWL). The isolated lignins were more stable against oxidative thermodegradation than spruce MWL. The UV-extinction coefficients at 280 nm were lower for the isolated lignins than for MWL.
机译：在170，C，20、60和100分钟的时间内，在170摄氏度下用加压热水提取云杉碎木。在XAD-7树脂上分离出释放的芳香物质（以木材计为2.2％至2.5％），然后分馏为木质素，低聚芳香物质（OAS）和不溶于甲醇的化合物（IMC）。通过理化方法（GC，GC-MS，HPLC-SEC，TG，DSC）对分离出的芳烃馏分以及提取前后的磨碎木材进行表征。芳族物质的主要部分是低聚芳族物质（OAS）。该分数随提取时间而显着增加，而溶解的木质素的收率随提取时间仅略有增加。分离出的木质素的摩尔质量较低，与云杉磨碎的木质素（MWL）差异很大。分离的木质素比云杉MWL更稳定地抗氧化热降解。分离出的木质素在280 nm处的紫外线消光系数低于MWL。

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