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Chapter 16. Characterization of Water-Soluble Components from MDF Fibers

机译：第16章从MDF纤维表征水溶性组分

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In medium density fiberboard (MDF) production, the high temperature preheating stage prior to refining has been shown to greatly affect both fiber and panel properties. The severity of preheating is reflected by the extent of fiber solubilization. It was therefore important to establish the nature and significance of the solubilized components. The water-soluble extract from a commercially sourced Pinus radiata MDF pulp was separated into neutral and acidic components. The neutral components were further separated by gel permeation chromatography (GPC). The isolated GPC fractions were then chemically characterized by a combination of NMR spectroscopy, compositional analysis, sugar linkage analysis, and electrospray mass-spectrometry (ES-MS) techniques. Chemical analysis revealed that only the hemicelluloses were solubilized with no apparent liberation of cellulose. Two-dimensional ~1H/~(13)C-NMR spectroscopy and ES-MS analyses confirmed that the glucomannan was naturally acetylated and predominately substituted at position 3 of the mannosyl residue.
机译：在中密度纤维板（MDF）的生产中，精炼前的高温预热阶段已显示出极大地影响纤维和面板性质。预热的严重程度被纤维溶解程度反映。因此，重要的是建立溶解组分的性质和意义。将来自商业源性松弛的水溶性松弛MDF纸浆分离成中性和酸性组分。通过凝胶渗透色谱法（GPC）进一步分离中性成分。然后通过NMR光谱，组成分析，糖连锁分析和电喷雾质谱（ES-MS）技术的组合化学表征分离的GPC级分。化学分析显示，只有半纤维素溶解，没有明显释放的纤维素。二维〜1H /〜（13）C-NMR光谱和ES-MS分析证实，葡甘胺天然乙酰化并主要被取代在甘露糖基残基的位置3处。

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