Spectroscopy: Mar 31, 2014
This article provides a basic overview of the capabilities of transmission gratings optimized for molecular spectroscopy.
Spectroscopy: Jun 30, 2011
Simulated leaf spectral data were generated to analyze scattering impact and then compared to experimental data to validate the conclusions of the simulation.
Spectroscopy: Apr 30, 2011
Our yearly review of the hottest products at Pittcon
Spectroscopy: Mar 31, 2011
The wavelet packet transform (WPT) combined with the modified uninformative variable elimination (MUVE) method (WPT–MUVE) is proposed to select variables for multivariate calibration of spectral data.
Spectroscopy: Aug 10, 2009
The development of a method for the simultaneous determination of glycine, triglycine and fructose using UV–vis and evaporative light-scattering detection (ELSD) is described. This was necessary as part of a research project dealing with the recovery of functional peptides from aqueous streams on an industrial scale using adsorption or related technologies. Fructose is barely detectable by UV–vis as it lacks detectable functionalities, while glycine and triglycine are both UV–vis sensitive. An NH2 phase was chosen as a column and separation was obtained within seven minutes on a 250 X 4.6 mm column. Limits of detection are approximately 40 mg fructose/L, 4 mg glycine/L and 0.05 mg triglycine/L. Calibration functions are linear in a range of 40–1400 mg/L for fructose, 5–200 mg/L for glycine and 0.5–70 mg/L for triglycine.
May 14, 2009
By Spectroscopy Editors
In an upcoming spacewalk, shuttle astronauts will swap the Corrective Optics Space Telescope Axial Replacement (COSTAR) device for the new Cosmic Origins Spectrograph (COS).
Application Notebook: Feb 01, 2009
Some powders and rough surfaced solids change color as a function of temperature, a phenomenon known as thermochromism. Such phenomena can be effectively studied by UV-Visible spectroscopy in combination with a diffuse reflection accessory equipped with temperature-controlled reaction chamber, as demonstrated here with a thermal paint.
Wavelength: Aug 06, 2008
Data are presented for a pH-adjustable liquid UV-matrix-assisted laser desorption ionization (MALDI) matrix for mass spectrometry analysis. The liquid matrix system possesses high analytical sensitivity within the same order of magnitude as that achievable by the commonly used solid UV-MALDI matrices but with improved spot homogeneity and reproducibility. The pH of the matrix has been adjusted, achieving an on-target pH range of 3.5?8.6, which has allowed for the performance of a tryptic digest within the diluted pH-optimized liquid matrix.
Spectroscopy: Mar 01, 2008
By Spectroscopy Editors
While the overall laboratory UV and Visible spectroscopy market was worth well over $700 million in 2007, the UV/Vis/NIR segment represented less than 10% of it. UV/Vis/NIR instruments utilize multiple detectors to cover a broader spectrum of analysis, and typically are among the highest-end systems in the UV-Vis market.