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United States Department of Agriculture

Agricultural Research Service

Research Project: Influence of Structure and Moisture on Cotton Fiber Properties

Location: Cotton Structure and Quality Research

Title: Chromophores in cellulosics, XI: isolation and identification of residual chromophores from bacterial cellulose

Authors
item Rosenau, Thomas -
item Potthast, Antje -
item Krainz, Karin -
item Hettegger, Hubert -
item Henniges, Ute -
item Yoneda, Yuko -
item Rohrer, Christian -
item French, Alfred -

Submitted to: Cellulose
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: May 5, 2014
Publication Date: July 1, 2014
Citation: Rosenau, T., Potthast, A., Krainz, K., Hettegger, H., Henniges, U., Yoneda, Y., Rohrer, C., French, A. 2014. Chromophores in cellulosics, XI: isolation and identification of residual chromophores from bacterial cellulose. Cellulose. DOI 10.1007/s10570-014-0289-0.

Interpretive Summary: Cotton or linen fabrics and paper, as well as other items composed chiefly of cellulose, tend to change to a yellow or brown color as they age. The change in color is usually accompanied by increased brittleness and loss of strength, as well. A cause of these phenomena is thought to be the formation of chemical compounds (chromophores) that originate in the individual glucose units of the cellulose which consists of many glucose residues connected together. In the present work, many aspects of the structure and chemistry of another important chromophore, 5,8-dihydroxy-[1,4]-napthoquinone are brought together along with new results from computational quantum mechanics studies to obtain new understanding of the various reaction mechanisms and potential ways to stop, or slow, the deterioration of items made from cellulose. Current attempts to change the color are by bleaching, for example, are largely futile because the benzoquinone structure is readily re-oxidized to the dihydroxy benzoquinone, a chromophore that is visible at the parts per billion level. Other chemical remedies are discussed.

Technical Abstract: Cotton or linen fabrics and paper, as well as other items composed chiefly of cellulose, tend to change to a yellow or brown color as they age. The change in color is usually accompanied by increased brittleness and loss of strength, as well. A cause of these phenomena is thought to be the formation of chemical compounds (chromophores) that originate in the individual glucose units of the cellulose which consists of many glucose residues connected together. In the present work, many aspects of the structure and chemistry of another important chromophore, 5,8-dihydroxy-[1,4]-napthoquinone are brought together along with new results from computational quantum mechanics studies to obtain new understanding of the various reaction mechanisms and potential ways to stop, or slow, the deterioration of items made from cellulose. Current attempts to change the color are by bleaching, for example, are largely futile because the benzoquinone structure is readily re-oxidized to the dihydroxy benzoquinone, a chromophore that is visible at the parts per billion level. Other chemical remedies are discussed.

Last Modified: 12/21/2014
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