Results 301 to 310 of about 522,116 (371)

Validation of an analytical method for the quantitative determination of selenium in bacterial biomass by ultraviolet-visible spectrophotometry.

Food Chemistry, 2018
The present paper describes the validation of a spectrophotometry method involving molecular absorption in the visible ultraviolet-visible (UV-Vis) region for selenium (Se) determination in the bacterial biomass produced by lactic acid bacteria (LAB ...
Ana Paula Mörschbächer, Anja Dullius, Carlos Henrique Dullius, Cassiano Ricardo Bandt, Daniel Kuhn, D. Brietzke, Fernando José Malmann Kuffel, Henrique Pretto Etgeton, Taciélen Altmayer, Tamara Engelmann Gonçalves, E. Oreste, A. S. Ribeiro, Claucia Fernanda Volken de Souza, L. Hoehne   +13 more
semanticscholar   +1 more source

UVA/UVB sunscreen determination by second-order derivative ultraviolet spectrophotometry

Il Farmaco, 1999
J. S. Azevedo, N. S. Viana Junior, C. D. Vianna Soares   +2 more
exaly   +2 more sources

Simultaneous determination of valsartan and hydrochlorothiazide in tablets by first-derivative ultraviolet spectrophotometry and LC

Journal of Pharmaceutical and Biomedical Analysis, 2001
Nilgün Gunden Goger, Sibel A Özkan, Zühre Şentürk   +2 more
exaly   +2 more sources

Studies on chitosan: 1. Determination of the degree of N-acetylation of chitosan by ultraviolet spectrophotometry and gel permeation chromatography

International Journal of Biological Macromolecules, 1986
Sei-Ichi Aiba
exaly   +2 more sources

Correlations in Ultraviolet Spectrophotometry

Applied Spectroscopy, 1957
In the process of collecting a library of spectra of aromatic compounds for investigation of synthetic liquid fuels, various correlations have been observed. (1) Phenylnaphthalene-type spectra have been noted in related compounds, (2) spectra and structures of fluorene derivatives have been studied; (3) graphs of intensity as a function of wavelength ...
openaire   +1 more source

Solvents for ultraviolet spectrophotometry

Talanta, 1959
Abstract Mathematical relations are presented showing the effect of light absorption by the solvent on the absorption measurements. A simple modification in the silica-gel adsorption method of purifying iso octane is described that greatly improves the transmittance in the 2000 A region. A procedure of purifying dioxan is also included.
openaire   +1 more source

Wavelength Anomalies in Ultraviolet-Visible Spectrophotometry

Applied Spectroscopy, 2012
Spectral scans of atomic line emission sources with a Shimadzu UV2101PC spectrophotometer show that the nominal wavelength depends upon the instrumental slit width, the wavelength sampling interval, and for some slit widths, also on the specified spectral range.
openaire   +2 more sources

Instrumental and chemometric analysis of opiates via gas chromatography–vacuum ultraviolet spectrophotometry (GC-VUV)

Analytical and Bioanalytical Chemistry, 2020
Zackery R. Roberson, H. Gordon, J. Goodpaster   +2 more
semanticscholar   +1 more source

Far Ultraviolet Solution Spectrophotometry

Applied Spectroscopy, 1973
Techniques and apparatus for extending conventional solution absorption spectrophotometry into the far uv region are discussed. The principal difficulties of spectroscopy in this region are reviewed. Applications and examples are given in inorganic, organic, and biological chemistry.
openaire   +1 more source

Infrared and ultraviolet spectrophotometry in residue evaluations

1964
In order to begin this discussion of infrared and ultraviolet spectrophotometry in residue evaluations, it is important to discuss briefly the broad field of spectrophotometry and to define the various regions of the electromagnetic spectrum of interest.
openaire   +2 more sources