Results 201 to 210 of about 16,029 (248)

FT-Raman spectroscopy of biological molecules

Mikrochimica Acta, 1988
Raman spectroscopy of biological molecules is often very difficult if not impossible due to a large fluorescence background from absorbing species, either from the molecule itself or an impurity. Photobleaching is occasionally successful in photochemically removing fluorescent impurities, but the majority of samples are not responsive to such treatment.
Vickie M. Hallmark, Carl G. Zimba, Jerome D. Swalen, John F. Rabolt   +3 more
openaire   +1 more source

FT-Raman spectroscopy of titania hydrolysates

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 1997
Abstract FT-Raman spectroscopy has been used to study the peptisation of titania hydrolysates produced from tetraisopropyltitanate (TPT), chemically modified by reaction with a number of carboxylic acids. During peptisation with nitric acid at 333 K, a colloidal sol of well crystallised anatase was formed. Similar sols were formed by heating at 333 K
Venz, P A, Frost, R L, Bartlett, J R, Woolfrey, J L   +3 more
openaire   +2 more sources

Analysis of microsamples with an FT-Raman microscope

Proceedings, annual meeting, Electron Microscopy Society of America, 1992
Rapid developments in near-IR filter and detector technology have resulted in FT-Raman spectroscopy emerging as a powerful technique in both research and analytical laboratories. The more recent advances in FT-Raman instrumentation now emphasize the optimization of different sampling accessories, including microsampling techniques. Microscopes attached
N.T. Kawai, J. Sawatski, C. Lehner
openaire   +1 more source

Determination of nutritional parameters of yoghurts by FT Raman spectroscopy

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2018
FT-Raman quantitative analysis of nutritional parameters of yoghurts was performed with the help of partial least squares models. The relative standard errors of prediction for fat, lactose and protein determination in the quantified commercial samples equalled to 3.9, 3.2 and 3.6%, respectively.
Tomasz, Czaja, Maria, Baranowska, Sylwester, Mazurek, Roman, Szostak   +3 more
openaire   +2 more sources

The Quantitative Analysis of Crystallinity Using FT-Raman Spectroscopy

Pharmaceutical Research, 1998
To establish if FT-Raman spectroscopy can be used to quantitate the degree of crystallinity in a model compound.Mixtures containing different proportions of amorphous and crystalline indomethacin were prepared. Using the peak intensity ratio 1698 cm(-1) (crystalline) to 1680 cm(-1) (amorphous), a correlation curve was prepared.
L S, Taylor, G, Zografi
openaire   +2 more sources

FT-Raman and SERS spectra of rivanol in silver sol

Talanta, 2000
FT-Raman of solid rivanol (2-ethoxy-6,9-diaminoacridinium lactate C(15)H(16)N(3)O-C(3)H(5)O(3) . H(2)O) and surface-enhanced Raman scattering (SERS) on silver surface of rivanol solution at pH 5.5 have been obtained and compared. The assignment of vibrational modes has been made for the monocation specie of rivanol.
T, Iliescu, S, Cinta, W, Kiefer
openaire   +2 more sources

Quantification of gluten in wheat flour by FT-Raman spectroscopy

Food Chemistry, 2016
A procedure for the quantitative determination of gluten in wheat flour based on partial least squares (PLS) treatment of FT-Raman data is described. Results of similar quality were found using a PLS model derived from NIR (near infrared) spectra obtained in DRIFTS (diffuse reflectance infrared Fourier transform spectroscopy) mode and of slightly worse
Tomasz, Czaja, Sylwester, Mazurek, Roman, Szostak   +2 more
openaire   +2 more sources

FTIR and FT-Raman spectra of 5-methyluracil (thymine)

Journal of Raman Spectroscopy, 2000
FTIR and FT-Raman spectra of 5-methyluracil (thymine) were recorded in the regions 400–4000 cm−1 and 50–4000 cm−1, respectively. The observed wavenumbers were analysed and assigned to different normal modes of vibration of the molecule. Ab initio and density functional calculations were performed to support the assignments of the observed wavenumbers ...
V. K. Rastogi, Chattar Singh, Vaibhav Jain, M. Alcolea Palafox   +3 more
openaire   +1 more source

CHARACTERIZATION OF CHRYSOTILE, ANTIGORITE AND LIZARDITE BY FT-RAMAN SPECTROSCOPY

The Canadian Mineralogist, 2003
We analyzed samples of antigorite, lizardite and fibrous chrysotile, three representative minerals of the serpentine group, to determine their chemical and structural properties, and their FT-Raman spectra. The low-frequency region of the spectrum (1200– 200 cm –1 ), which corresponds to the lattice-vibration modes, was then analyzed, and the observed ...
RINAUDO, Caterina, GASTALDI D, BELLUSO E.   +2 more
openaire   +2 more sources

FT–Raman spectrometry determination of Malathion in pesticide formulations

Talanta, 2004
A fast and environmentally friendly method has been developed for Fourier transform-Raman (FT-Raman) spectrometry determination of Malathion in pesticide emulsifiable concentrate formulations. The method is based on the measurement of intensity peak height values at 1737cm(-1) Raman shift corrected using a baseline defined at 1900cm(-1).
Guillermo, Quintás, Salvador, Garrigues, Miguel, de la Guardia   +2 more
openaire   +2 more sources