Improving the thermal stability of different types of xylan by acetylation

de Carvalho, Danila MoraisKTH,Royal Inst Technol, Dept Fibre & Polymer Technol, SE-10044 Stockholm, Sweden.;KTH, Royal Inst Technol, Dept Fibre & Polymer Technol, Wallenberg Wood Sci Ctr, SE-10044 Stockholm, Sweden.;Univ Helsinki, Dept Food & Nutr, FI-00014 Helsinki, Finland. (author)

QC 20200316
The impact of various degrees of acetylation on improving the thermal stability of xylan isolated from different botanical source has been studied; methylglucuronoxylan from birch and eucalyptus, arabinoglucuronoxylan from spruce and glucuronoarabinoxylan from sugarcane bagasse and straw. The lower molecular weight of nonacetylated methylglucuronoxylan (17.7-23.7 kDa) and arabinoglucuronoxylan (16.8 kDa) meant that they were more soluble in water than glucuronoarabinoxylan (43.0-47.0 kDa). The temperature at the onset of degradation increased by 17-61 degrees C and by 75-145 degrees C for low and high acetylated xylans respectively, as a result of acetylation. A glass transition temperature in the range of 121-132 degrees C was observed for the samples non-acetylated and acetylated at low degree of acetylation (0.0-0.6). The acetylation to higher degrees (1.4-1.8) increased the glass transition temperature of the samples to 189-206 degrees C. Acetylation proved to be an efficient method for functionalization of the xylan to increase the thermal stability.

Berglund, JennieKTH,Fiber- och polymerteknologi(Swepub:kth)u18atm7f (author)
Marchand, CeliaKTH,Fiber- och polymerteknologi(Swepub:kth)u1qwrvmf (author)
Lindström, Mikael,Professor,1967-KTH,Fiber- och polymerteknologi(Swepub:kth)u1uxn4q9 (author)
Vilaplana, Francisco,1979-KTH,Fiber- och polymerteknologi(Swepub:kth)u173a4yy (author)
Sevastyanova, OlenaKTH,Fiber- och polymerteknologi,Wallenberg Wood Science Center(Swepub:kth)u1roovny (author)
KTHRoyal Inst Technol, Dept Fibre & Polymer Technol, SE-10044 Stockholm, Sweden.;KTH, Royal Inst Technol, Dept Fibre & Polymer Technol, Wallenberg Wood Sci Ctr, SE-10044 Stockholm, Sweden.;Univ Helsinki, Dept Food & Nutr, FI-00014 Helsinki, Finland. (creator_code:org_t)

By the author/editor: de Carvalho, Dan ...; Berglund, Jennie; Marchand, Celia; Lindström, Mikae ...; Vilaplana, Franc ...; Sevastyanova, Ol ...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Chemical Enginee ...; and Polymer Technolo ...

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