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Molecules 2008, 13(12), 3129-3139; doi:10.3390/molecules13123129

Photodegradation of Acidolysis Lignin from BCMP

1,* , 2
1 Wood and Paper Science and Technology Department, University of Tehran, Karaj, Iran 2 Department of Chemistry, Payam-e-Nour University, Tehran, Iran 3 Wood and Paper Science and Technology Department, Islamic Azad University, Karaj Branch, Karaj, Iran
* Author to whom correspondence should be addressed.
Received: 11 November 2008 / Revised: 19 November 2008 / Accepted: 3 December 2008 / Published: 15 December 2008
(This article belongs to the Special Issue Phenolics and Polyphenolics)
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A mild acidic dioxane extraction method was employed to isolate lignin from hardwood bleached chemimechanical pulp (BCMP). The isolated lignin was then purified and undergone elemental analysis. To study the photodegradation behavior, the lignin samples were impregnated onto the Whatman filter papers and irradiated with UV light for various periods. The photolyzed lignin was then recovered and analyzed by 1H-NMR spectroscopy. Phenylpropane-based formula (C9) of CMP pulp lignin and the photolyzed samples were then established with elemental analysis and 1H-NMR spectroscopy data. The results indicated that the benzaldehyde and benzoic acid type compounds were the main photodegradation products of BCMP lignin. The lignin photodegradation probably involved the degradation of phenylcoumaran units. Irradiation also increased the phenolic hydroxyl group content and decreased that of methoxyl groups, due to demethoxylation. The degrees of aromatic ring condensation were increased upon continuing the irradiation time, which imples the formation of condensed structures in photolyzed lignin.
Keywords: Lignin; Photodegradation; BCMP; 1H-NMR Lignin; Photodegradation; BCMP; 1H-NMR
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Azadfallah, M.; Mirshokraei, S.A.; Latibari, A.J. Photodegradation of Acidolysis Lignin from BCMP. Molecules 2008, 13, 3129-3139.

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