UV/Vis Spectroscopy / Ezine
Golden arsenic assessment
Date: Dec 1, 2009
Author: David Bradley
A new light-scattering technique that uses gold nanoparticles can selectively detect arsenic ions, without interference from dissolved alkali and alkali earth metals, improving on water tests based on Raman and SPR. UV-Vis spectroscopy was used in conjunction with tunnelling electron microscopy to characterise the nanoparticles themselves.
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Quality of sour cream packaged in cups with different light barrier properties measured by fluorescence spectroscopy and sensory analysis
Date: Nov 9, 2009
Author:
The photooxidation of sour cream packaged in cups with different light barrier properties was investigated by sensory analysis and front face fluorescence spectroscopy.
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Methylmercury marker
Date: Nov 1, 2009
Author: David Bradley
Detecting methylmercury usually involves complex sample preparation and a sophisticated analytical procedure. Now, a European team has developed a novel approach to detecting this hazardous substance much more quickly and easily using a new type of fluorescent marker.
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Tracing of intracellular zinc(II) fluorescence flux to monitor cell apoptosis by using FluoZin-3AM
Date: Oct 12, 2009
Author:
The zinc(II) probe FluoZin-3AM was used to distinguish between different stages of apoptotic cell (induced by the anticancer agent etoposide) by tracing the intracellular zinc(II) fluorescence flux.
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Optical sniffer detects poison gas
Date: Oct 1, 2009
Author: David Bradley
US researchers have developed an optoelectronic nose that can sniff out toxic gases. The sensor is fast and inexpensive and could be used to detect high exposure risk to hazardous industrial chemicals.
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Fluorescence of unmodified oligonucleotides: A tool to probe G-quadruplex DNA structure
Date: Sep 14, 2009
Author:
Unlabelled oligonucleotides that form G-quadruplexes can be differentiated from similar sequences that do not contain consecutive guanines on the basis of their fluorescence spectra.
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One from the vine
Date: Sep 1, 2009
Author: David Bradley
Kudzu is a weedy vine that has overgrown almost 10 million acres in the southeastern United States. However, it could one day sprout into a dietary supplement to helpe reduce metabolic syndrome in millions of people. Mass spectrometry and UV spectroscopy have now been used to identify and quantify the putatively active isoflavones in extracts of the vine by US scientists.
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Nonlinear optical spectroscopy of soft matter interfaces
Date: Aug 10, 2009
Author:
New developments that enable us to obtain detailed molecular structural changes in the topmost molecular layers of soft matter interfaces composed of complex bio-molecules are reviewed. In particular, the possibilities to probe interfaces of colloidal soft matter systems are discussed.
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Microbial nanotechnologists
Date: Aug 1, 2009
Author: David Bradley
The bacterium Bacillus licheniformis is an expert nanotechnologist, according to scientists in India. They have used the microbe to help them synthesise gold nanocubes, as verified by UV spectroscopy and other techniques. The approach offers an alternative approach to making these important nanoparticles without using high temperatures or toxic solvents.
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Optical spectroscopy of InGaN-GaN quantum dot ensembles
Date: Jul 13, 2009
Author:
InGaN-GaN quantum dots grown with variations in the deposition time to vary their properties were studied by atomic force microscopy and photoluminescence spectroscopy.
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