Reducing the content of VOCs of softwood kraft lignins for material applications

Anna Kalliola, Anne Savolainen, Taina Ohra-aho, Greta Faccio, Tarja Tamminen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

Three laccases functioning in mild acidic and one in slightly alkaline (pH 8) conditions were evaluated in order to reduce small-molecular phenolic VOCs of kraft lignins, which could be used in lignin/natural fibers composites. The potential of a sulfhydryl oxidase to catalyze the oxidation of sulphur containing VOCs (thiols) was also tested in combination with the laccase catalyzed oxidation at pH 8. In addition, oxidation at alkaline pH at room temperature that may induce polymerization of phenolics in an analogous manner to the laccase-catalysed reaction was investigated. Enzyme reactivity towards lignins was evaluated as consumption of oxygen in the reaction solution. The effect of treatments on VOC reduction was determined both by sensing (odorimetry) and chemical (thermal desorption GC/MS, SEC) analyses. Laccases Lcc2 and MaL from Thielavia arenaria and Melanocarpus albomyces, respectively, showed potential in reducing odors. The most promising results were obtained by oxidizing lignin at alkaline pH. However, the odor threshold values of the main VOC compounds are extremely low, which poses a challenge to VOC reduction. (18 refs.)
Original languageEnglish
Title of host publicationProceedings
Subtitle of host publication16th International Symposium on Wood, Fiber and Pulping Chemistry, 16th ISWFPC
Pages1102-1107
Volume2
Publication statusPublished - 2011
MoE publication typeA4 Article in a conference publication
Event16th International Symposium on Wood, Fiber and Pulping Chemistry, 16th ISWFPC - Tianjin, China
Duration: 8 Jun 201110 Jun 2011

Conference

Conference16th International Symposium on Wood, Fiber and Pulping Chemistry, 16th ISWFPC
Abbreviated title16th ISWFPC
CountryChina
CityTianjin
Period8/06/1110/06/11

Keywords

  • VOC
  • kraft lignin
  • laccase
  • sulfhydryl oxidase
  • composite

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    Kalliola, A., Savolainen, A., Ohra-aho, T., Faccio, G., & Tamminen, T. (2011). Reducing the content of VOCs of softwood kraft lignins for material applications. In Proceedings: 16th International Symposium on Wood, Fiber and Pulping Chemistry, 16th ISWFPC (Vol. 2, pp. 1102-1107)