Du är här

Heat extraction of corn fiber hemicellulose

Författare:
Publiceringsår: 2007
Språk: Engelska
Sidor: 253-265
Publikation/Tidskrift/Serie: APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
Volym: 137
Dokumenttyp: Artikel
Förlag: HUMANA PRESS INC

Sammanfattning

Water-soluble hemicellulose was extracted from corn fiber with microwave-assisted heat treatment. The effects of treatment temperature and initial pH of the aqueous extraction media were investigated regarding hemicellulose recovery and molecular mass of the isolated polysaccharides. In treatments carried out at neutral pH (simple water extraction), it has been demonstrated that hemicellulose recovery could be increased by applying higher treatment temperatures. However, the molecular weight of isolated hemicellulose gets significantly lower. For example, 10% of the raw materials' xylan was extracted at 160 degrees C and about 30% recovery was reached at 210 degrees C. However, the molecular mass of the isolated polysaccharide at 210 degrees C (5.82 x 10(4)) was about half of that measured at 160 degrees C (1.37 x 10(5)). Reducing the pH with sulfuric acid resulted in shorter polymer chains (1.7 x 10(4)) and lower hemicellulose yields (2.2%). Application of sodium hydroxide in the treatment showed that, compared with acid, considerably higher yields (11%) with longer polysaccharide chains (1.3 x 10(5)) could be obtained.

Disputation

Nyckelord

  • Chemistry
  • size exclusion chromatography
  • fractionation
  • microwave-assisted
  • alkaline extraction
  • carbohydrate analysis
  • weight-average molecular
  • weight
  • maize

Övrigt

Published
Yes
  • ISSN: 0273-2289

Box 117, 221 00 LUND
Telefon 046-222 00 00 (växel)
Telefax 046-222 47 20
lu [at] lu [dot] se

Fakturaadress: Box 188, 221 00 LUND
Organisationsnummer: 202100-3211
Om webbplatsen

LERU logo U21 logo