Journal
CELLULOSE
Volume 18, Issue 6, Pages 1623-1633Publisher
SPRINGER
DOI: 10.1007/s10570-011-9585-0
Keywords
Cellulose; Cotton; Chromophores; Aging; Bleaching; CRI method; Hydroxybenzoquinones; Hydroxynaphthoquinones; Hydroxyacetophenones; Quantum mechanics
Funding
- Austrian Christian-Doppler-Society
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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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