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UV Spectroscopy

Chinese scientists have published in the journal Talanta details of a quick and simply UV-Vis colour change technique for detecting melamine contamination in milk products. The test might help prevent future fraud using this toxic compound.

Lanthanum was encapsulated in a complexing silica xerogel and the fluorescence of different compositions was measured to develop neural network models for estimating the fluorescence intensity based on the reaction mixture composition.

UV and NMR spectroscopy as well as other techniques have been used to study the slow release of insulin from water-soluble chitosan nanoparticles. The system has potential as a novel drug delivery agent for use in controlling diabetes using a nasal spray.

The common assumptions used in models to predict dyebath concentrations and dyebath exhaustion using optical absorbance measurements that cause prediction errors are examined, especially for cases of multiple dye combinations.

A new system for non-electronic communication that can transmit alphanumeric information encoded as pulses of light, over intervals of hours, without needing electricity and so remaining operational even without batteries in remote, hazardous or poor locations.

In order to reduce the number of invasive biopsy procedures, a portable clinical system was designed based upon the excitation of endogenous fluorescence in vivo at 405 nm via a fiber-optics probe inside a disposable needle of small diameter

Like a previously unknown species emerging into the glare of camera flashlights from the tropical undergrowth or crawling out from under a deep ocean rock, a seemingly simple small molecule, an organosulfur compound called oxathiirane, has been synthesised at long last and reveals itself under ultraviolet spectroscopic inspection.

Studies on CO<sub>2</sub> assimilation, conductance and chlorophyll fluorescence in barley (<em>Hordeum vulgare</em> L.) exposed to increasing doses of glyphosate suggest that gas-exchange parameters are more sensitive biomarkers for glyphosate toxicity than chlorophyll fluorescence.

Quantum dots (QDs) have received significant attention in biological and biomedical fields. Now, UV-Vis spectroscopy and other techniques have been used to investigate their utility in enhancing the activity of the anticancer agent daunorubicin (DNR) in treating leukaemia cells.

Hair samples treated with 55 different red hair dyes were analyzed using UV-visible microspectrophotometry between 200 and 700 nm. The contribution of the hair substrate is predominantly observed at 300-400 nm while the dye peak is evident at 425-550 nm.

With suitable chemical modification, unprecedented room temperature liquid porphyrins could be used as optical limiters in optoelectronics and spectroscopic instrumentation, according to researchers in Poland.

Simian cellular prion protein epitopes were mapped by flow cytometry using monoclonal antibodies. Blood lymphocytes from asymptomatically infected as well as diseased macaques were characterized by increased CD230 fluorescence.

Sunscreen and boron can work together to make a compound that changes colour when touched under ultraviolet light. The compound changes from blue-green to yellow with the gentlest of rubs and then reverts quickly to blue-green when gently warmed, although the process is reversible at room temperature.

A method was described for the preparation of nanostructured polyaniline via the oxidation polymerization of aniline hydrochloride in the presence of an anionic surfactant.

The reduction of greenhouse gas carbon dioxide to a useful chemical industry feedstock material, carbon monoxide, can be catalysed by a ruthenium-substituted polyoxometalate according to a new study. The work holds the promise of our developing a carbon-neutral energy platform.

Deconv, an open-source deconvolution software package, was developed for 3-D quantitative fluorescence microscopy imaging and was released under the GNU Public License.

Spectroscopy reveals that an extraordinarily bright, very long-lasting supernova named SN 2007bi, spotted in the night sky by a robotic telescope is the first example of the earliest type of star in the universe.

The structural parameters and absorption spectra of more than 30 N-benzylideneaniline dyes have been determined with a theoretical scheme combining the time-dependent density functional theory and the polarizable continuum model.

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.

The photooxidation of sour cream packaged in cups with different light barrier properties was investigated by sensory analysis and front face fluorescence spectroscopy.