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Chemical and ultrastructural changes in compound middle lamella (CML) regions of softwoods thermally modified by the Termovuoto process

机译:用Termovuoto工艺热改性的软木复合中间层(CML)区的化学和超微结构变化

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摘要

Silver fir and Norway spruce wood have been thermally modified (TMW) for 3-4 h at 160 degrees C, 180 degrees C, 200 degrees C, and 220 degrees C by means of the thermovacuum process (Termovuoto), and the ultrastructural and chemical changes in the compound middle lamella (CML), including the middle lamella cell corner (MLcc) regions (CMLcc), were investigated. Severe anatomical and histochemical changes were prominent above treatment temperatures of 200 degrees C; thus, woods treated at 220 degrees C for 4 h were in focus. Immunocytochemical studies showed that noncellulosic polysaccharides, such as pectin, xyloglucan, xylan, and mannan, were significantly degraded in CMLcc regions of TMWs. After treatment, the CMLcc regions were composed almost entirely of modified lignin with increased amounts of acidic groups. With cytochemical staining for lignin, many electron dense particulates were detected in the CMLcc regions of TMWs, indicating early degradation/alteration by the Termovuoto treatment.
机译:银杉和挪威云杉木材已通过热真空工艺(Termovuoto)以及超微结构和化学方法在160°C,180°C,200°C和220°C下热改性(TMW)3-4小时研究了复合中间片(CML)的变化,包括中间片细胞角(MLcc)区域(CMLcc)。在200摄氏度以上的治疗温度下,严重的解剖和组织化学变化尤为明显;因此,重点是在220摄氏度下处理4小时的木材。免疫细胞化学研究表明,非纤维素多糖(如果胶,木葡聚糖,木聚糖和甘露聚糖)在TMWs的CMLcc区显着降解。处理后,CMLcc区域几乎全部由带有增加量的酸性基团的改性木质素组成。用木质素进行细胞化学染色,在TMWs的CMLcc区域中检测到许多电子致密颗粒,表明通过Termovuoto处理可进行早期降解/改变。

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