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Long-standing theory disproved: Fingerprint of dissolved glycine in the terahertz range explained

Date:
March 28, 2014
Source:
Ruhr-Universitaet-Bochum
Summary:
Chemists have, for the first time, completely analyzed the fingerprint region of the terahertz spectrum of a biologically relevant molecule in water, in this case, an amino acid. By combining spectroscopy and molecular-dynamics simulations, they rendered the motion of the most basic amino acid, glycine, visible in an aqueous solution. Their results have disproved the long-standing theory that frequencies in the terahertz range provide no information regarding the amino acid’s motion.

The molecular motion of the amino acid glycine and its surrounding water molecules result in the formation of characteristic bands in the Terahertz spectrum.
Credit: © RUB, illustration: Decka, Havenith

Chemists at the Ruhr-Universität Bochum (RUB) have, for the first time, completely analysed the fingerprint region of the terahertz spectrum of a biologically relevant molecule in water, in this case, an amino acid. By combining spectroscopy and molecular-dynamics simulations, they rendered the motion of the most basic amino acid, glycine, visible in an aqueous solution. Their results have disproved the long-standing theory that frequencies in the terahertz range provide no information regarding the amino acid's motion.

The team led by Prof Dr Martina Havenith-Newen and Prof Dr Dominik Marx published their report in the Journal of the American Chemical Society (JACS).

Representing molecular motion by means of terahertz spectroscopy

Researchers use terahertz (THz) spectroscopy to send short radiation pulses into a sample of interest. The terahertz range covers wavelengths of one to ten THz (0.3 millimetres to 30 micrometres) and extends between the infrared and the microwave range. The sample, in this case a mixture of water and glycine, partially absorbs the radiation, forming an absorption pattern, which is represented by chemists in the form of a spectrum. Certain areas of the spectrum, so-called bands, describe the motions of molecular bonds. Individual atoms in a molecule are not bonded rigidly; rather, they are permanently in motion. Complex computer simulations contribute significantly to analysing the spectra, as it is not always easy to decipher which individual bands of a spectrum correlate with which molecular motions.

THz analysis renders glycine motion in water visible

The RUB team has proved that THz analysis may be used to represent both the motion inside the glycine molecule and the motion of the glycine molecule together with its bound water molecules. The bands in the terahertz spectrum, moreover, reflected the glycine's opening and closing motion. The spectrum also incorporated the motion of hydrogen bridges between the glycine and its bound water molecules. "The interaction between ab initio molecular-dynamics simulations and terahertz spectroscopy provides us with an excellent instrument for tracking and understanding solvation processes on the molecular level," says Martina Havenith-Newen, Head of the Department of Physical Chemistry II.

The project was developed under the auspices of the Excellence Cluster "RESOLV" (Ruhr Explores Solvation, EXC 1069) at the Ruhr-Universität Bochum, whose speaker is Martina Havenith-Newen. The German Research Foundation (DFG) granted the Cluster in June 2012.


Story Source:

The above story is based on materials provided by Ruhr-Universitaet-Bochum. Note: Materials may be edited for content and length.


Journal Reference:

  1. Jian Sun, Gudrun Niehues, Harald Forbert, Dominique Decka, Gerhard Schwaab, Dominik Marx, Martina Havenith. Understanding THz Spectra of Aqueous Solutions: Glycine in Light and Heavy Water. Journal of the American Chemical Society, 2014; 140321090716008 DOI: 10.1021/ja4129857

Cite This Page:

Ruhr-Universitaet-Bochum. "Long-standing theory disproved: Fingerprint of dissolved glycine in the terahertz range explained." ScienceDaily. ScienceDaily, 28 March 2014. <www.sciencedaily.com/releases/2014/03/140328075813.htm>.
Ruhr-Universitaet-Bochum. (2014, March 28). Long-standing theory disproved: Fingerprint of dissolved glycine in the terahertz range explained. ScienceDaily. Retrieved September 21, 2014 from www.sciencedaily.com/releases/2014/03/140328075813.htm
Ruhr-Universitaet-Bochum. "Long-standing theory disproved: Fingerprint of dissolved glycine in the terahertz range explained." ScienceDaily. www.sciencedaily.com/releases/2014/03/140328075813.htm (accessed September 21, 2014).

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