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preparative tlc plates
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Showing 1-20 of 20 results for "preparative tlc plates" within Papers
Hye Jin Kim et al.
Phytochemical analysis : PCA, 22(3), 258-262 (2010-10-29)
Direct analysis in real time (DART) ion source is a powerful ionising technique for the quick and easy detection of various organic molecules without any sample preparation steps, but the lack of quantitation capacity limits its extensive use in the
Cecilia Labbé et al.
Journal of natural products, 70(12), 2019-2021 (2007-11-21)
GC-MS and (1)H NMR spectroscopic profiling of a CDCl 3 extract of the liverwort Riccardia polyclada (syn. R. umbrosa) revealed the presence of four main compounds bearing several chlorine atoms on a bibenzyl skeleton. Separation of a CH 2Cl 2
Nurhayat Tabanca et al.
Biomolecules, 10(5) (2020-05-02)
The Mediterranean fruit fly, Ceratitis capitata (Wiedemann) (Diptera: Tephritidae) poses a major threat to fruit and vegetable production in the United States and throughout the world. New attractants and detection methods could improve control strategies for this invasive pest. In
Robert Zakrzewski et al.
Journal of chromatography. B, Analytical technologies in the biomedical and life sciences, 824(1-2), 222-228 (2005-08-16)
Reaction between iodine and azide ion induced by mercaptopyridines and mercaptopyrimidines was utilized as a detection system in TLC and HPTLC. The developed plates were sprayed with a freshly prepared mixtures of sodium azide and starch solution adjusted to pH
Bahram Hemmateenejad et al.
The Analyst, 135(7), 1747-1758 (2010-04-28)
This paper addresses the solution of peak overlapping, as a fundamental problem in TLC, by multivariate analysis of the images recorded by a digital camera. We report the results of our study on the application of multivariate image analysis (MIA)
Ewelina Sobstyl et al.
Journal of chromatography. A, 1618, 460942-460942 (2020-02-15)
The fruit of Schisandra chinensis (Chinese magnolia vine), the medicinal plant well-known in Traditional Chinese Medicine, gains great popularity in the modern phytopharmacology. This phenomena is related to the wide and powerful healing properties, including supporting immune, nervous and digestive
K M Sharif et al.
Biomedical chromatography : BMC, 29(12), 1826-1833 (2015-06-03)
Multivariate analysis of thin-layer chromatography (TLC) images was modeled to predict antioxidant activity of Pereskia bleo leaves and to identify the contributing compounds of the activity. TLC was developed in optimized mobile phase using the 'PRISMA' optimization method and the
Urszula Hubicka et al.
Acta poloniae pharmaceutica, 72(1), 31-37 (2015-04-09)
A thin layer chromatographic-densitometric method has been developed for identification and quantitative determination of neomycin derivative with dabsyl chloride. The analysis of antibiotic was achieved on the silica gel TLC plates with fluorescent indicator with n-butanol--2-butanone--25% ammonia--water (10 : 6
Piotr Garnuszek et al.
Nuclear medicine review. Central & Eastern Europe, 15(2), 95-100 (2012-09-01)
The reliable method for determination of identity and radiochemical purity (RCP) is of great importance in radiopharmaceutical development. This is especially relevant when more than one form of radiometal/ligand complex can be formed during radiolabelling, such as complexes of 99mTc
Anna Kwiecień et al.
Acta poloniae pharmaceutica, 70(4), 643-652 (2013-08-08)
The purpose of this work was to develop a sensitive stability indicating TLC-densitometric method for the determination of betaxolol (Bx) in pharmaceutical preparations and to study the stability of Bx in acidic solutions. The method was developed on TLC aluminium
Jan Srbek et al.
Talanta, 130, 518-526 (2014-08-28)
In this study, direct analysis in real time-mass spectrometry (DART-MS) was assessed for the analysis of various pharmaceutical formulations with intention to summarize possible applications for the routine pharmaceutical development. As DART is an ambient ionization technique, it allows direct
B Simonovska
Journal of AOAC International, 80(3), 688-692 (1997-05-01)
Milligram quantities of sulfoxides, sulfones, and oxygen analogue (oxon) sulfones of the insecticides disulfoton, phorate, and terbufos were prepared by selective oxidation. Pure insecticides or acetone extracts of granular formulations served as reactants. Structures of 9 compounds were confirmed by
A Loidl et al.
Journal of lipid research, 43(5), 815-823 (2002-04-25)
Sphingomyelinases are important enzymes of signal transduction. They catalyze the hydrolysis of sphingomyelin, giving rise to the intracellular formation of biologically active ceramide and phosphatidylcholine. Here we report on a fluorescence method for the fast and accurate determination of this
Silvia A Coran et al.
Journal of chromatography. A, 1045(1-2), 217-222 (2004-09-24)
A HPTLC-densitometric method, based on an external standard approach, was developed in order to obtain a novel procedure for routine analysis of secoisolariciresinol diglucoside (SDG) in flaxseed with a minimum of sample pre-treatment. Optimization of TLC conditions for the densitometric
Liwei Wang et al.
Phytochemical analysis : PCA, 22(1), 14-17 (2010-08-28)
Asparagus officinalis L. has several biological activities including antifungal, antiviral and antitumoral activities due to the steroidal saponins. Normally diosgenin and sarsasapogenin are analysed separately by thin-layer chromatography or high-performance liquid chromatography (HPLC-UV or HPLC-ELSD), which is time-consuming and expensive
Urszula Hubicka et al.
Journal of AOAC International, 91(5), 1186-1190 (2008-11-05)
A thin-layer chromatography (TLC)-densitometric method was developed to determine N-(hydroxymethyl)nicotinamide in tablets and basic solutions along with nicotinic acid. Analysis was performed on silica gel F254 plates using chloroform-ethanol (2 + 3, v/v) mobile phase. The densitometric observations were made
Barbara A Theiler et al.
Phytochemical analysis : PCA, 28(2), 87-92 (2016-12-03)
α-Glucosidase inhibitors form an essential basis for the development of novel drugs in diabetes type 2 treatment. Searching for α-glucosidase inhibitors in plants, TLC bioautographic assays have been established and improved within the last years. In traditional medicine, extracts from
Marianne Nebsen et al.
Drug testing and analysis, 3(4), 221-227 (2011-04-19)
Three sensitive, selective, and precise stability-indicating methods for the determination of the novel osteoarthritis drug, diacerein (DIA) in the presence of its alkaline degradation product (active metabolite, rhein) and in pharmaceutical formulation were developed and validated. The first method is
C Gonçalves et al.
Chemosphere, 64(8), 1375-1382 (2006-02-14)
The photochemical persistence of quinalphos, one of the most widely used organophosphorous insecticides, was investigated in a variety of environmental matrices such as natural waters and soils of different composition. Simulated solar irradiation was obtained using a xenon arc lamp
Felipe Marques Teixeira et al.
Journal of ethnopharmacology, 260, 112841-112841 (2020-04-09)
Cecropia Loefl. species (Urticaceae) are widely spread across the rainforest in tropical and subtropical regions of Central and South America. Inhabitants of different regions of Brazil employ leaves, fruits and sprouts of Cecropia hololeuca Miq. mainly as anti-inflammatory, anti-asthmatic, expectorant
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