方法对比
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| 克拉森木质素× | 纤维素结晶度× | X射线密度测定法× | |
|---|---|---|---|
| 领域 | 林学 | 林学 | 林学 |
| 方法族 | Process / pipeline | Process / pipeline | Process / pipeline |
| 起源年份≠ | 1908 | 1959 | 2005 |
| 提出者≠ | Erik Klason | Leonard Segal | Gabriel Gazo |
| 类型≠ | chemical analysis | structural analysis | measurement method |
| 开创性文献≠ | TAPPI T222 om-15. (2015). Acid-insoluble lignin in wood and pulp. TAPPI Press. link ↗ | Segal, L., Creely, J. J., Martin, A. E., & Conrad, C. M. (1959). An empirical method for estimating the degree of crystallinity of native cellulose using the X-ray diffractometer. Textile Research Journal, 29(10), 786–794. DOI ↗ | Hansmann, C., Wimmer, R., & Gindl, W. (2007). Assessing damage in wood-polymer composites by depth-sensing indentation. Composites Part A, 38(6), 1502–1508. link ↗ |
| 别名 | acid-insoluble lignin, lignin content | cellulose structure, crystalline index | wood density, radiography |
| 相关 | 3 | 3 | 3 |
| 摘要≠ | The Klason lignin method is a standard chemical test for quantifying the acid-insoluble lignin content in wood and plant biomass. Developed by Erik Klason in 1908, the method treats wood with sulfuric acid to dissolve carbohydrates (cellulose and hemicellulose) while leaving the acid-insoluble lignin residue. Klason lignin is widely used in wood science, pulp chemistry, and biomass characterization to assess wood composition and predict properties. | Cellulose crystallinity refers to the degree of structural order in cellulose molecules: highly crystalline cellulose has organized, tightly packed chains; amorphous cellulose has disordered chains. Measured using X-ray diffraction, cellulose crystallinity influences wood strength, stiffness, and digestibility in pulping and enzymatic processes. Higher crystallinity correlates with greater strength and lower chemical reactivity. | X-ray densitometry is a nondestructive method for measuring wood density, microdensity profiles, and ring-by-ring density variation in wood samples using X-ray image analysis. The method uses attenuation of X-rays passing through wood to quantify mass per unit volume. It enables rapid assessment of wood quality without destroying material, making it valuable for research, timber grading, and genetic selection programs. |
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