Effect of pH on lignin analysis by Raman spectroscopy
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Elina Warsta
Abstract
Ultraviolet resonance Raman (UVRR) spectroscopy is a powerful tool for structural lignin analysis in situ: modification or isolation of lignin from biomass is not necessary. UVRR spectroscopy is equally applicable for samples with high lignin content and those with very low lignin content. Monomeric phenolic lignin model compounds and wood pulp samples have been studied at neutral and alkaline pH with UVRR spectroscopy. Concentration of guaiacol correlated well with the relative Raman band intensity, which indicates that lignin-containing solutions can be quantitatively measured with UVRR spectroscopy. A change in pH induced a recordable shift in the aromatic band position in the spectra, which was 25–35 cm-1 with phenolic model compounds without para substitution, 8–12 cm-1 with phenolic model compounds with para substitution, and about 2–7 cm-1 with pulp samples. No shift was detected with a non-phenolic model compound. Increasing the amount of phenolic hydroxyl groups increased the UVRR band shift in pulp samples. Additionally, increasing the pH enhanced the relative aromatic band intensity in the UVRR spectra in solution of the phenolic model compound. Accordingly, pH adjustment is relevant prior to any lignin analysis with Raman spectroscopy.
©2012 by Walter de Gruyter Berlin Boston
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- Meetings
- Meetings
- Masthead
- Masthead
Articles in the same Issue
- Original Papers
- Synthesis of glucose esters from cellulose in ionic liquids
- A new soy flour-polyepoxide adhesive system for making interior plywood
- Hydrophobisation of mechanical pulp fibres with sodium dodecyl sulphate functionalised layered double hydroxide particles
- Effect of pH on lignin analysis by Raman spectroscopy
- Fractionation and characterization of lignin carbohydrate complexes (LCCs) of Eucalyptus globulus in residues left after MWL isolation. Part I: Analyses of hemicellulose-lignin fraction (HC-L)
- Surface and internal micro/ultrastructure of TMP fibres produced during high-intensity refining elucidate the development of pulp and paper properties
- Mechanoradical formation and its effects on birch kraft pulp during the preparation of nanofibrillated cellulose with Masuko refining
- Influence of specimen configuration on the measurement of the off-axis Young’s modulus of wood by vibration tests
- Effect of lignin and hemicelluloses on the tensile strength of micro-veneers determined at finite span and zero span
- Revisiting the neutral axis in wood beams
- Relationship between copper species in solution and leaching from alkaline copper quat (ACQ) treated wood
- Assessment of the early signs of decay of Populus deltoides wafers exposed to Trametes versicolor by near infrared spectroscopy
- Community analysis of preservative-treated southern pine (Pinus spp.) using terminal restriction fragment length polymorphism (T-RFLP) analysis. Part 1: Fungal field study
- Community analysis of preservative-treated southern pine (Pinus spp.) using terminal restriction fragment length polymorphism (T-RFLP) analysis. Part 2: Bacteria field study
- Phylogenetic analysis and discoloration characteristics of major molds inhabiting woods. Part 3. Genus Cladosporium
- Identification of biochemical differences between the sapwood and transition zone in Robinia pseudoacacia L. by differential display of proteins
- Short Notes
- Reduction of formaldehyde emission from light MDF panels by adding chestnut shell flour
- On the structure of the active compound in mass deacidification of paper
- Meetings
- Meetings
- Masthead
- Masthead
