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Rocky road to confusion: Raman tricks geochemists

Date: Sep 1, 2011

Author: David Bradley

Raman spectroscopy has become an increasingly useful tool in the geosciences partly because it is non-destructive and requires minimal sample preparation, but also because it can be carried out on site with various irreplaceable geological samples. Unfortunately, Raman can confuse, especially when substances such as haematite and disordered carbonaceous materials are present in the same sample.

Read More thumbnail image: Rocky road to confusion Raman tricks geochemists

Journal Highlight: Tunable optical setup with high flexibility for spectrally resolved coherent anti-Stokes Raman scattering microscopy

Date: Aug 8, 2011

Author:

A simplified setup for coherent anti-Stokes Raman scattering microscopy allows for recording images with 30 cm-1 excitation band-width for probing Raman bands between 500 and 900 cm-1 with minimal requirements for alignment.

Read More thumbnail image: Journal Highlight Tunable optical setup with high flexibility for spectrally resolved coherent anti-Stokes Raman scattering microscopy

SNPs at a snip: SERS spots singles

Date: Aug 1, 2011

Author: David Bradley

Surface enhanced Raman spectroscopy can be used to detect single nucleotide substitutions (the all-important SNPs of genetic variance and personalised medicine) in DNA without the need for labels or indeed any chemical modification of the oligonucleotides.

Read More thumbnail image: SNPs at a snip SERS spots singles

Journal Highlight: Revealing the invisible: using SERS to identify minute remnants of color in Winslow Homer's colorless skies

Date: Jul 4, 2011

Author:

SERS spectra were recorded directly on single particles of red lake pigments from an important historical watercolor by the American master Winslow Homer that suffered some degree of fading to reveal accurate colorant identification.

Read More thumbnail image: Journal Highlight Revealing the invisible using SERS to identify minute remnants of color in Winslow Homers colorless skies

Cancer signals: Enhancing Raman endoscopy

Date: Jul 1, 2011

Author: David Bradley

Radioactively labelled gold nanoparticles can assist in a novel endoscopic technique using Raman spectroscopy to look at microscopic structures, including nascent tumours, deep within the body. Preclinical tests carried out using the technology shows that the gold nanoparticles can be administered safely and used to image the inside of the large intestine. The research bodes well for identification of malignant tissue in the earliest stages of colon cancer.

Read More thumbnail image: Cancer signals Enhancing Raman endoscopy

Journal Highlight: Rapid detection of ricin in milk using immunomagnetic separation combined with surface-enhanced Raman spectroscopy

Date: Jun 6, 2011

Author:

A rapid method that combined immunomagnetic separation and surface-enhanced Raman spectroscopy has been demonstrated for the detection of ricin in whole milk, the feasibility of a portable Raman instrument showing great promise for on-site detection in a processing facility.

Read More thumbnail image: Journal Highlight Rapid detection of ricin in milk using immunomagnetic separation combined with surface-enhanced Raman spectroscopy

Pure uranium: a Raman first

Date: Jun 1, 2011

Author: David Bradley

Scientists at the Indira Gandhi Centre for Atomic Research in Tamil Nadu have carried out the first study of "pure" uranium using Raman spectroscopy. The fundamental research offers new insights into this radioactive metal and may even have implication for developments in nuclear energy.

Read More thumbnail image: Pure uranium a Raman first

Journal Highlight: Raman spectroscopic mapping of the carbon and PTFE distribution in gas diffusion layers

Date: May 2, 2011

Author:

Raman microspectroscopy was used to gather spatially resolved chemical information on the carbon and poly(tetrafluoroethylene) distribution of fuel cell gas diffusion layers.

Read More thumbnail image: Journal Highlight Raman spectroscopic mapping of the carbon and PTFE distribution in gas diffusion layers

Sloshing charge: the origin of SERS

Date: May 1, 2011

Author: David Bradley

New quantum calculations show how electrical charge can slosh from a target molecule to the metal being used to enhance Raman signals in Surface-enhanced Raman spectroscopy (SERS). The finding could finally explain the mechanism by which this technique boosts Raman spectra in terms of the chemical contribution to the effect.

Read More thumbnail image: Sloshing charge the origin of SERS

Journal Highlight: Reliable and non-destructive Raman analysis to determine the urea concentration in a cream formulation

Date: Apr 4, 2011

Author:

A reliable and nondestructive analytical method for the determination of urea concentration in a pharmaceutical cream formulation using Raman spectroscopy gave accurate results despite the spectral collection being performed through plastic bottles.

Read More thumbnail image: Journal Highlight Reliable and non-destructive Raman analysis to determine the urea concentration in a cream formulation
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