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Singlet oxygen mediated degradation of Klason lignin

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Title: Singlet oxygen mediated degradation of Klason lignin
Authors: D'Auria, M., Bonini, C., Bentivenga, G., Mauriello, G., De Bona, A.
Source: Chemosphere. Dec1999, Vol. 39 Issue 14, p2409. 0p.
Subjects: Reactive oxygen species, Analytical chemistry
Abstract: After some results concerning photochemical generated singlet oxygenon lignins from steam explosion, the reactions of chemically generated singlet oxygen with Klason lignins from pine and beech are described. Singlet oxygen was produced through the reaction of hydrogen peroxide with sodium hypochlorite. The degradation of lignin was followedby uv spectroscopy and gel permeation chromatography. Extensive degradation of the lignins was observed when 20 mg of Klason lignin was treated with 1 ml of 30% hydrogen peroxide and 8.56 ml of 1.093 M sodium hypochlorite. In the uv spectra registered after the treatment with singlet oxygen the absorptions typical of lignin (210-220 nm and 250-280 nm) were completely absent. The gpc analysis of lignin after a treatment with 0.1 ml of hydrogen peroxide and 0.86 ml of sodium hypochlorite showed a clear reduction of signals due to the lignin and a shift to lower molecular weight. The potential use of this procedure in the bleaching procedure was tested by using recycled paper. A maximum reduction of 51% in the amount of lignin in this paper was observed. [ABSTRACT FROM AUTHOR]
Copyright of Chemosphere is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 8356897
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Singlet oxygen mediated degradation of Klason lignin
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  Data: <searchLink fieldCode="AR" term="%22D'Auria%2C+M%2E%22">D'Auria, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Bonini%2C+C%2E%22">Bonini, C.</searchLink><br /><searchLink fieldCode="AR" term="%22Bentivenga%2C+G%2E%22">Bentivenga, G.</searchLink><br /><searchLink fieldCode="AR" term="%22Mauriello%2C+G%2E%22">Mauriello, G.</searchLink><br /><searchLink fieldCode="AR" term="%22De+Bona%2C+A%2E%22">De Bona, A.</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Chemosphere%22">Chemosphere</searchLink>. Dec1999, Vol. 39 Issue 14, p2409. 0p.
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  Data: <searchLink fieldCode="DE" term="%22Reactive+oxygen+species%22">Reactive oxygen species</searchLink><br /><searchLink fieldCode="DE" term="%22Analytical+chemistry%22">Analytical chemistry</searchLink>
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  Label: Abstract
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  Data: After some results concerning photochemical generated singlet oxygenon lignins from steam explosion, the reactions of chemically generated singlet oxygen with Klason lignins from pine and beech are described. Singlet oxygen was produced through the reaction of hydrogen peroxide with sodium hypochlorite. The degradation of lignin was followedby uv spectroscopy and gel permeation chromatography. Extensive degradation of the lignins was observed when 20 mg of Klason lignin was treated with 1 ml of 30% hydrogen peroxide and 8.56 ml of 1.093 M sodium hypochlorite. In the uv spectra registered after the treatment with singlet oxygen the absorptions typical of lignin (210-220 nm and 250-280 nm) were completely absent. The gpc analysis of lignin after a treatment with 0.1 ml of hydrogen peroxide and 0.86 ml of sodium hypochlorite showed a clear reduction of signals due to the lignin and a shift to lower molecular weight. The potential use of this procedure in the bleaching procedure was tested by using recycled paper. A maximum reduction of 51% in the amount of lignin in this paper was observed. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Chemosphere is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Text: English
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      – SubjectFull: Analytical chemistry
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      – TitleFull: Singlet oxygen mediated degradation of Klason lignin
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              Text: Dec1999
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              Y: 1999
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