Results 211 to 220 of about 17,263 (255)
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The Quantitative Analysis of Crystallinity Using FT-Raman Spectroscopy
Pharmaceutical Research, 1998To 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
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Study of normal colorectal tissue by FT-Raman spectroscopy
Analytical and Bioanalytical Chemistry, 2006FT-Raman spectroscopy was employed to study normal human colorectal tissues in vitro with the aim of evaluating the spectral differences of the complex colon mucous in order to establish a characteristic Raman spectrum. The samples were collected from 39 patients, providing 144 spectra for the statistical analysis.
P O, Andrade +6 more
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FT-Raman spectral analysis of human urinary stones
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2012FT-Raman spectroscopy is the most useful tool for the purpose of bio-medical diagnostics. In the present study, FT-Raman spectral method is used to investigate the chemical composition of urinary calculi. Urinary calculi multi-components such as calcium oxalate, hydroxyl apatite, struvite and uric acid are studied.
R, Selvaraju, A, Raja, G, Thiruppathi
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FT Raman microscopy of untreated natural plant fibres
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 1997The application of FT-Raman microscopy to the non-destructive analysis of natural plant fibres is demonstrated with samples of flax, jute, ramie, cotton, kapok, sisal and coconut fibre. Vibrational assignments are proposed and characteristic features of each material are presented.
H G, Edwards, D W, Farwell, D, Webster
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FT-Raman and SERS spectra of rivanol in silver sol
Talanta, 2000FT-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
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Determination of nutritional parameters of yoghurts by FT Raman spectroscopy
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2018FT-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 +3 more
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FTIR and FT-Raman spectra of 5-methyluracil (thymine)
Journal of Raman Spectroscopy, 2000FTIR 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 +3 more
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Quantification of gluten in wheat flour by FT-Raman spectroscopy
Food Chemistry, 2016A 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 +2 more
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FT–Raman spectrometry determination of Malathion in pesticide formulations
Talanta, 2004A 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 +2 more
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Quantification of atorvastatin calcium in tablets by FT-Raman spectroscopy
Journal of Pharmaceutical and Biomedical Analysis, 2009The FT-Raman quantification of atorvastatin calcium in tablets was performed using the partial least squares (PLS), principal component regression (PCR) and counter-propagation artificial neural networks (CP-ANN) methods. To compare the predictive abilities of the elaborated models, the relative standard errors of prediction (RSEP) were calculated. The
Sylwester, Mazurek, Roman, Szostak
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