Assessment of Structural Differences between Water-Extracted and Non-Extracted Hydro-Thermally Treated Spruce Wood by NIR Spectroscopy
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Methods
3. Results and Discussion
3.1. NIR Spectroscopy
3.2. Principal Component Analysis (PCA)
3.3. Two-Dimensional Correlation Spectroscopy (2D-COS)
4. Conclusions
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Band Position | Assignment |
---|---|
4559 | combination band of C-H and C=O stretching vibration associated to lignin |
4632 | combination bands of Car-H and C=O stretching vibration associated to lignin and extractives |
4676 | C-H and C=O stretching vibration associated to hemicelluloses |
4756 | O-H and C-H deformation and O-H stretching vibrations in cellulose and hemicelluloses |
4816 | O-H and C-H deformation vibrations in cellulose and hemicelluloses |
4878 | C=O stretching vibration associated to hemicelluloses |
5092 | combination bands of O-H and C-H stretching vibration |
5140 | O-H groups involved in strong intramolecular hydrogen bonds and 2nd overtone of C=O stretching vibration mainly in hemicelluloses |
5216 | |
5315 |
Band Position | Assignment |
---|---|
5667 | 1st overtone of C-H stretching vibration in carbohydrates and lignin |
5720 | 1st overtone of C-H groups in hemicelluloses |
5796 | 1st overtone of C-H stretching in lignin |
5880 | 1st overtone of C-H stretching in lignin and CH2 groups in cellulose |
5972 | Car-H stretching vibration in lignin |
6136 | 1st overtone of O-H stretching vibration in cellulose |
6283 | 1st overtone of O-H stretching vibration in cellulose, strongly bonded O-H groups in crystalline regions and Iβ phase |
6418 | 1st overtone of O-H stretching vibration of the O(6)-H(6)…O(3)’ intermolecular H-bonds in cellulose |
6464 | 1st overtone of O-H stretching vibration of the O(3)-H(3)…O(5) intramolecular H-bonds in cellulose (crystalline regions C1) |
6647 | 1st overtone of O-H stretching vibration of the O(6)-H(6)…O(3)’ intermolecular H-bonds in cellulose |
6708 | 1st overtone of O-H stretching vibration of the O(3)-H(3)…O(5) intramolecular H-bonds in cellulose and glucomannan |
6753 | weakly hydrogen bonded OH groups of cellulose O(6)-H(6), 1st overtone of O-H stretching vibration in semi-crystalline cellulose |
6908 | phenolic O-H groups of lignin with intramolecular H-bonding to an ether group in ortho position and to extractives |
5667 | 1st overtone of C-H stretching vibration in carbohydrates and lignin |
5720 | 1st overtone of C-H groups in hemicelluloses |
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Popescu, C.-M.; Zeniya, N.; Endo, K.; Genkawa, T.; Matsuo-Ueda, M.; Obataya, E. Assessment of Structural Differences between Water-Extracted and Non-Extracted Hydro-Thermally Treated Spruce Wood by NIR Spectroscopy. Forests 2021, 12, 1689. https://0-doi-org.brum.beds.ac.uk/10.3390/f12121689
Popescu C-M, Zeniya N, Endo K, Genkawa T, Matsuo-Ueda M, Obataya E. Assessment of Structural Differences between Water-Extracted and Non-Extracted Hydro-Thermally Treated Spruce Wood by NIR Spectroscopy. Forests. 2021; 12(12):1689. https://0-doi-org.brum.beds.ac.uk/10.3390/f12121689
Chicago/Turabian StylePopescu, Carmen-Mihaela, Nanami Zeniya, Kaoru Endo, Takuma Genkawa, Miyuki Matsuo-Ueda, and Eiichi Obataya. 2021. "Assessment of Structural Differences between Water-Extracted and Non-Extracted Hydro-Thermally Treated Spruce Wood by NIR Spectroscopy" Forests 12, no. 12: 1689. https://0-doi-org.brum.beds.ac.uk/10.3390/f12121689