Chromophores in cellulosics, VI. First isolation and identification of residual chromophores from aged cotton linters |
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Authors: | Thomas Rosenau Antje Potthast Karin Krainz Yuko Yoneda Thomas Dietz Zenaida Peralta-Inga Shields and Alfred D French |
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Institution: | (1) Department of Chemistry, University of Natural Resources and Applied Life Sciences Vienna (BOKU), Muthgasse 18, 1190 Vienna, Austria;(2) Degussa, Hanau, Germany;(3) CleveTheoComp LLC, 1951 West 26th St, Suite 409, Cleveland, OH 44113, USA;(4) Southern Regional Research Center, US Department of Agriculture, 1100 Robert E. Lee Blvd, New Orleans, LA 70124, USA |
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Abstract: | In the present work, aged cotton linters have been analyzed for their chromophore content according to the CRI (“chromophore
release & identification”) method. Despite the very low contents in the ppb range, nine chromophores have been unambiguously
identified, which makes this account the first one on defined chromophoric structures isolated from cotton. A common feature
of the chromophores are 2-hydroxy-1,4]benzoquinone, 2-hydroxyacetophenone and 5,8-dihydroxynaphthoquinone moieties, which
resemble chromophoric structures found in other cellulosic substrates, such as bleached pulps or fibers. The finding of these
compounds in lignin-free cotton linters confirms the previous hypothesis that those chromophores are formed from (oxidized)
carbohydrate structures rather than from lignin fragments. |
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