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首页> 外文期刊>Journal of Wood Chemistry and Technology >AGE VARIATION OF DOUGLAS-FIR BARK CHEMICAL COMPOSITION
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AGE VARIATION OF DOUGLAS-FIR BARK CHEMICAL COMPOSITION

机译:道格拉斯-弗尔树皮化学成分的年龄变化

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The chemical composition of Douglas-fir bark was analyzed at three stem height levels of trees with different ages from two geographical locations. Cork and phloem in the bark's rhytidome were analyzed separately at stem bottom: extractives (49.8% and 17.0%, respectively), suberin (30.1% in cork) and hemicelluloses, namely arabinose content (25.3% and. 4.8% of all monomers, respectively). Suberin composition includes α,ω-alkanoic diacids (38.6%), ω-hydroxyalkanoic acids (25.6%), alkanoic acids (18.2%), alkanols (2.2%), and aromatics (8.8%). Bark's chemical composition is age-related, namely regarding suberin content: at 45, 30 and, 17years of age, bark contained respectively 25.4%, 2.6%, and 0.9% of suberin; 24.5%, 33.9%, and 29.8% of lignin; and 29.4%, 20.6%, and 25.7% of extractives. This difference is due to the small number of periderms and low cork content in barks with 30 or less years. When aiming at a cork-targeted valorization, the lower stem parts of mature Douglas-fir trees should be considered while the high content of polar extractives at all stem heights allows an overall potential valorization.
机译:在两个地理位置不同年龄的树木的三个茎高水平上,对花旗松树皮的化学成分进行了分析。在茎的底部分别对树皮的根茎中的软木和韧皮部进行了分析:提取物(分别为49.8%和17.0%),木栓蛋白(在软木中为30.1%)和半纤维素,即阿拉伯糖含量(分别为所有单体的25.3%和4.8%)。 )。 er粉组成包括α,ω-链烷二酸(38.6%),ω-羟基链烷酸(25.6%),链烷酸(18.2%),链烷醇(2.2%)和芳族化合物(8.8%)。树皮的化学成分与年龄有关,即关于木脂素的含量:在45岁,30岁和17岁时,树皮分别含有25.4%,2.6%和0.9%的木脂素;木质素的24.5%,33.9%和29.8%;分别为29.4%,20.6%和25.7%。这种差异是由于30年或更短时间内树皮中的蠕变数量少和软木塞含量低所致。以软木为目标的增值目标时,应考虑成熟的花旗松树的下部茎部,而在所有茎高处极性提取物的含量较高,因此有潜在的整体增值潜力。

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