Skip to page content
USDA Forest Service
  
Treesearch

Research & Development Treesearch

 
Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Northern
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help
 

Science.gov - We Participate


USA.gov  Government Made Easy


Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.
20090-6090

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (308 KB bytes)

Title: The complex of xylan and iodine: the induction and detection of nanoscale order

Author: Yu, Xiaochun; Atalla, Rajai H.;

Date: 2005

Source: Carbohydrate research. Vol. 340 (2005): p. 981-988.

Publication Series: Miscellaneous Publication

Description: The complex of xylan and iodine and its formation in a solution of xylan, CaCl2, and I2 + KI was investigated by UV/Vis, second-derivative UV/Vis, and Raman spectroscopy. The complex forms only at very high concentrations of CaCl2, suggesting that when the water available in the solution is not sufficient to fully hydrate the calcium cation the chelation with the hydroxyl groups of the xylan can occur. The electronic spectra indicate that iodine is present in the form of three linear polyiodides I9 3-, I11 3-, and I13 3- structures, which the Raman spectra show to be linear aggregates of the I3- and I5- substructures. Iodide concentration has a significant influence on the relative population of I9 3-, I11 3-, and I13 3-, as well as I3- and I5-, which lead to changes in both the UV/Vis absorption maxima shifts and changes in the Raman spectra. The key difference between this system of complexes with the linear polyiodide aggregates and that of amylose is that the longest aggregate observed with the amylose system, the I15 3- polyanion, is not observed with the xylans. This indicates that the ordered arrays in the xylan–iodine complex do not exceed 4 nm in length. It is not possible to conclude at this time whether the ordered segment of the xylan molecule is linear or helical. If it is linear the length of the longest ordered arrays would be eight xylose residues. The number would exceed eight if the xylan molecule were helically wound.

Keywords: Xylan, polyiodide, xylan-dodine complex, nanoscale order, cellulose fibers, nanotechnology, birch, color, spectrum analysis, hydroxyl group, iodine, raman spectroscopy, calcium chloride, chelation

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

XML: View XML

Citation:


Yu, Xiaochun; Atalla, Rajai H. 2005. The complex of xylan and iodine: the induction and detection of nanoscale order. Carbohydrate research. Vol. 340 (2005): p. 981-988.

 


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.