Terahertz and far infrared Spectroscopy of alanine-rich peptides having variable ellipticity

Ding, Tao, Li, Ruoyu, Zeitler, J. Axel, Huber, Thomas L., Gladden, Lynn F., Middelberg, Anton P. J. and Falconer, Robert J. (2010) Terahertz and far infrared Spectroscopy of alanine-rich peptides having variable ellipticity. Optics Express, 18 26: 27431-27444. doi:10.1364/OE.18.027431


Author Ding, Tao
Li, Ruoyu
Zeitler, J. Axel
Huber, Thomas L.
Gladden, Lynn F.
Middelberg, Anton P. J.
Falconer, Robert J.
Title Terahertz and far infrared Spectroscopy of alanine-rich peptides having variable ellipticity
Journal name Optics Express   Check publisher's open access policy
ISSN 1094-4087
Publication date 2010-12-20
Sub-type Article (original research)
DOI 10.1364/OE.18.027431
Open Access Status DOI
Volume 18
Issue 26
Start page 27431
End page 27444
Total pages 14
Place of publication Washington, DC, United States
Publisher Optical Society of America
Collection year 2011
Language eng
Abstract Terahertz spectra of four alanine-rich peptides with known secondary structures were studied by terahertz time domain spectroscopy (THz-TDS) and by Fourier transform infrared spectroscopy (FTIR) using a synchrotron light source and a liquid-helium cooled bolometer. At ambient temperatures the usable bandwidth was restricted to 0.2-1.5 THz by the absorbance of water. The existence of a solvation shell around the peptide in solution was observed and its size estimated to be between 11 and 17 Å. By cooling the peptide solution to 80 K in order to reduce the water absorbance the bandwidth was increased to 0.1-3.0 THz for both THz-TDS and FTIR. Spectra were consistent with monotonic absorbance of the peptide and the existence of a solid amorphous low density solvation shell. © 2010 Optical Society of America.
Keyword Absorbances
Ambient temperatures
Helium cooled
Low density
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published under Spectroscopy

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
Australian Institute for Bioengineering and Nanotechnology Publications
 
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Created: Sun, 30 Jan 2011, 10:02:09 EST