Polysaccharides in some industrially important hardwood species

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)


Interna författare/redaktörer


Publikationens författare: Willfor S, Sundberg A, Pranovich A, Holmbom B
Förläggare: SPRINGER
Publiceringsår: 2005
Tidskrift: Wood Science and Technology
Tidskriftsakronym: WOOD SCI TECHNOL
Volym: 39
Nummer: 8
Artikelns första sida, sidnummer: 601
Artikelns sista sida, sidnummer: 617
Antal sidor: 17
ISSN: 0043-7719


Abstrakt

The amount and composition of sugar units comprising polysaccharides in sapwood and heartwood, or stemwood, of 11 industrially important pulpwood species were analysed. The polysaccharide content was between 60 and 80% (w/w) for all species, with cellulose as the predominant polysaccharide type and glucuronoxylans as the main non-cellulosic polysaccharides. The second most abundant non-cellulosic polysaccharides were either pectins, i.e. polygalacturonic acids, or glucomannans. The amount of acidic sugar units were 15-23% of the total amount of non-cellulosic sugar units in all samples, with the Acacia species in the high end. The amount and composition of water-soluble carbohydrates from ground wood samples were also analysed, since these are important in mechanical and chemimechanical pulping, and as a possible source of bioactive polymers. Sapwood released more carbohydrates than heartwood for most species. It is to be noted that the relative amount of dissolved acidic sugar units was larger from the heartwood than from the sapwood for all species. Probably due to the mild treatment conditions, the main dissolved polysaccharides were xylans only for a few samples, while easily soluble galactans, arabinogalactans, or mannans dominated in most species. Pectins dominated in heartwood of Populus grandidentata. Generally, pectins and acidic xylans were the main acidic polysaccharides.


Nyckelord

hardwoods, Polysaccharides

Senast uppdaterad 2019-14-12 vid 02:48