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 language | English |
|---|---|
| Title of host publication | Proceedings |
| Subtitle of host publication | 16th International Symposium on Wood, Fiber and Pulping Chemistry, 16th ISWFPC |
| Pages | 1102-1107 |
| Volume | 2 |
| Publication status | Published - 2011 |
| MoE publication type | A4 Article in a conference publication |
| Event | 16th International Symposium on Wood, Fiber and Pulping Chemistry, ISWFPC 2011 - Tianjin, China Duration: 8 Jun 2011 → 10 Jun 2011 |
Conference
| Conference | 16th International Symposium on Wood, Fiber and Pulping Chemistry, ISWFPC 2011 |
|---|---|
| Country/Territory | China |
| City | Tianjin |
| Period | 8/06/11 → 10/06/11 |
Keywords
- VOC
- kraft lignin
- laccase
- sulfhydryl oxidase
- composite