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Degradation of Cellulose at the Wet/Dry Interface. I. The Effect of Some Conservation Treatments on Brown Lines

Degradation of Cellulose at the Wet/Dry Interface. I. The Effect of Some Conservation Treatments... INTRODUCTION' In 1934, Bone noted that when a strip of pure bleached cotton was dipped with one end into pure water, a brown line developed at the edge separating wet and dry material.1 This problem was studied in the dye and textile industry and overcome by the development of better drying techniques in the mid-1960's. More recently, the problem of water-stained cellulosic material has been encountered by paper and textile conservators. The browning is produced by the formation of unsaturated compounds with the presence of conjugated double bonds. Most chemical systems in which browning occurs contain carbonyl or potential carbonyl groups as the reducing sugars which are further transformed into unsaturated colored compounds. Polyhydroxy compounds in which the carbonyl group is blocked, such as sugars in their cyclic form, do not directly give rise to browning." At first, they should undergo oxidation. In the macromolecule of cellulose, glucose residues are in their cyclic form (Fig.l). Oxidation reactions which involve the presence of oxygen are a common catise of browning. The very particular micro environment of the cellulose at the wet/dry interface might be necessary for oxidation to occur at this location. This article contains results of an investigation http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Restaurator - International Journal for the Preservation of Library and Archival Material de Gruyter

Degradation of Cellulose at the Wet/Dry Interface. I. The Effect of Some Conservation Treatments on Brown Lines

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References (11)

Publisher
de Gruyter
Copyright
Copyright © 2009 Walter de Gruyter
ISSN
0034-5806
eISSN
1865-8431
DOI
10.1515/rest.1996.17.1.1
Publisher site
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Abstract

INTRODUCTION' In 1934, Bone noted that when a strip of pure bleached cotton was dipped with one end into pure water, a brown line developed at the edge separating wet and dry material.1 This problem was studied in the dye and textile industry and overcome by the development of better drying techniques in the mid-1960's. More recently, the problem of water-stained cellulosic material has been encountered by paper and textile conservators. The browning is produced by the formation of unsaturated compounds with the presence of conjugated double bonds. Most chemical systems in which browning occurs contain carbonyl or potential carbonyl groups as the reducing sugars which are further transformed into unsaturated colored compounds. Polyhydroxy compounds in which the carbonyl group is blocked, such as sugars in their cyclic form, do not directly give rise to browning." At first, they should undergo oxidation. In the macromolecule of cellulose, glucose residues are in their cyclic form (Fig.l). Oxidation reactions which involve the presence of oxygen are a common catise of browning. The very particular micro environment of the cellulose at the wet/dry interface might be necessary for oxidation to occur at this location. This article contains results of an investigation

Journal

Restaurator - International Journal for the Preservation of Library and Archival Material – de Gruyter

Published: Jan 1, 1996

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