Pressurised hot water extraction of acetylated xylan from birch sawdust

Petri Kilpeläinen*, Kaisu Leppänen, Peter Spetz, Veikko Kitunen, Hannu Ilvesniemi, Andrey Pranovich, Stefan Willför

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArtikkeliTieteellinenvertaisarvioitu

32 Sitaatiot (Scopus)

Abstrakti

Birch sawdust was extracted using pressurized hot water (PHW), with the ultimate aim of maximizing the yield of large and intact non-cellulosic heteropolysaccharides, i.e. hemicellulose molecules. The extractions were performed using a flow-through vessel. Effects of different extraction temperatures between 140 and 200°C were evaluated. The amount of extracted xylans, as well as mono-saccharides, increased as the temperature rose to 190°C, accordingly the degree of polymerization of the xylans decreased. The extracted xylans retained most of the native acetyl groups and were thereby water-soluble after the extraction. The PHW extract contained not only xylan and other hemicellulose-derived oligomers, but fragmented lignin molecules and some extractives as well. Only trace amounts of furfurals were found in the extract at lower extraction temperatures. An optimal yield of water-soluble, polymeric xylans with the smallest amount of unwanted impurities and degradation products was thus achieved at an extraction temperature of 180°C using the flow-through vessel.

AlkuperäiskieliEnglanti
Sivut680-688
Sivumäärä9
JulkaisuNordic Pulp and Paper Research Journal
Vuosikerta27
Numero4
DOI - pysyväislinkit
TilaJulkaistu - 2012
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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