The Reaction of Phloroglucinol in the Presence of Acid with Ligin-Containing Materials

Davidson, R. Stephen and Choudhury, Hasneen and Origgi, S. and Castellan, Alain and Trichet, Veronique and Capretti, G. (1995) The Reaction of Phloroglucinol in the Presence of Acid with Ligin-Containing Materials. Journal of Photochemistry and Photobiology a-Chemistry, 91 (1). pp. 87-93. ISSN 1010-6030. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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UV-visible diffuse reflectance spectrometry has been used to monitor the reaction of phloroglucinol (in the presence of hydrochloric acid) with high yield pulps. When papers made from such pulps are irradiated, coniferaldehyde residues are generated as judged by their reaction with phloroglucinol/HCl. Treatment of such papers with sodium borohydride reduces the coniferaldehyde residues and consequently no colour reaction with phloroglucinol/HCl is observed. Irradiation of these borohydride-reduced papers leads to the generation of coniferaldehyde entities as detected by phloroglucinol/HCl. Similar results were obtained using a thin section of abies wood. Irradiation of papers made from high yield pulps destroys coniferaldehyde residues on the one hand and generates them from other sources on the other hand. Examination of papers made from the morphological components of poplar showed that it is impossible to quantify the amount of lignin present by this colour test method. Thioacidolysis analysis of the fractions shows for all of them a higher proportion of syringyl than guaiacyl beta-O-4 aryl ether linkages. In contrast, photocleavage of the beta-O-4 aryl ether linkages is more important for the guaiacyl structures. This is in accordance with the observed higher sensitivity to UV light of softwood pulps compared with hardwood pulps. Also, the thioacidolysis experiments indicate that UV irradiation of the fractions maintains a stationary concentration of the coniferaldehyde structures.

Item Type: Article
Subjects: Q Science > QD Chemistry
Divisions: Faculties > Science Technology and Medical Studies > School of Engineering and Digital Arts
Depositing User: P. Ogbuji
Date Deposited: 03 Jun 2009 15:16
Last Modified: 16 May 2014 09:23
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