Singlet oxygen degradation of lignin

Carlo Bonini, Maurizio D'Auria, Luciano D'Alessio, Giacomo Mauriello, Daniela Tofani, Donato Viggiano, Francesco Zimbardi

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Abstract

Lignin obtained by steam explosion of straw, beech (a hardwood plant), and pine (a softwood plant) was isolated and characterized by using standard methods. The irradiation of lignins with visible light in the presence of oxygen and of a singlet oxygen sensitizer (Rose Bengal) induced several modifications in the lignin structures that were monitored by using gel permeation chromatography (GPC) and UV spectroscopy. We observed a remarkable reduction of the mass distribution by GPC when monitoring at 280 nm and the shift of the residual chromatograms to mass values lower than the native lignins. These data are in agreement with a depolymerization reaction of lignins. The UV spectra showed that all the chemical species of lignins undergo several modifications during the irradiation reaction. Thus, the E1band reduced its absorbance and underwent a hypsochromic shift. The E2and the B band were greatly reduced during the irradiation. © 1998 Elsevier Science S.A.
Original languageEnglish
Pages (from-to)119 - 124
Number of pages6
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume113
Issue number2
DOIs
Publication statusPublished - 28 Feb 1998

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Physics and Astronomy(all)

Cite this

Bonini, C., D'Auria, M., D'Alessio, L., Mauriello, G., Tofani, D., Viggiano, D., & Zimbardi, F. (1998). Singlet oxygen degradation of lignin. Journal of Photochemistry and Photobiology A: Chemistry, 113(2), 119 - 124. https://doi.org/10.1016/S1010-6030(97)00340-7