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Keyword:'modified silica hptlc plates'
Showing 31-60 of 83 results for "modified silica hptlc plates" within Papers
Renata Nowak et al.
Acta poloniae pharmaceutica, 70(3), 413-418 (2013-06-14)
Spices play an important role in the chemoprevention and they can be a rich source of biologically active compounds such as triterpenes in the human diet. A method based on high performance thin-layer chromatography combined with densitometry for determination of
Aysel Oztunç et al.
Journal of AOAC International, 93(2), 556-561 (2010-05-20)
HPLC and TLC methods were developed for separation and detection of some amphetamine analogs: methamphetamine (MA); 3,4-methylenedioxymethamphetamine (MDMA, "ecstasy"); and 3,4-methylenedioxy-N-ethylamphetamine (MDEA) in spiked plasma samples. The methods are based on purple chromogens formed by displacement reaction of these secondary
Jin Wang et al.
Journal of AOAC International, 93(5), 1376-1383 (2010-12-15)
A simple HPTLC method has been developed for the simultaneous determination of isoorientin, isovitexin, orientin, and vitexin, both pure and in commercial samples of bamboo-leaf flavonoids. The flavone C-glycosides, including isoorientin, isovitexin, orientin, and vitexin, were extracted from bamboo-leaf flavonoids
Nasir A Siddiqui et al.
Journal of chromatographic science, 53(5), 824-829 (2015-02-11)
A simple, sensitive high-performance thin-layer chromatography (HPTLC) method was developed for the simultaneous quantification of biomarker bergenin and menisdaurin in the methanol extracts of aerial parts of Flueggea virosa (FVME). Chromatography was performed on glass-backed silica gel 60F254 HPTLC plates
Iris Meisen et al.
Rapid communications in mass spectrometry : RCM, 19(24), 3659-3665 (2005-11-15)
Shiga toxin 1 (Stx1) represents an AB5 toxin produced by enterohemorrhagic Escherichia coli, which cause gastrointestinal diseases in humans that are often followed by potentially fatal systemic complications, such as acute encephalopathy and hemolytic uremic syndrome. The expression of the
Maya S Eissa et al.
Journal of chromatographic science, 55(4), 417-428 (2016-12-19)
Loxoprofen sodium (LOX) is a recently developed novel propionic acid derivative. Owing to its instability under both hydrolytic and oxidative conditions, the development of simple, rapid and sensitive methods for its determination in the presence of its possible forced degradation
Shikha Gupta et al.
Journal of pharmaceutical and biomedical analysis, 66, 33-39 (2012-04-03)
A new validated high-performance thin-layer chromatographic (HPTLC) method has been developed for the simultaneous quantitation of four antipsychotic indole alkaloids (IAs), reserpiline (RP, 1), α-yohimbine (YH, 2), isoreserpiline (IRP, 3) and 10-methoxy tetrahydroalstonine (MTHA, 4) as markers in the leaves
Shazia Khan et al.
Biomedical chromatography : BMC, 29(10), 1594-1603 (2015-04-02)
Artemisinin (AN) and artemisinic acid (AA), valuable phyto-pharmaceutical molecules, are well known anti-malarials, but their activities against diseases like cancer, schistosomiasis, HIV, hepatitis-B and leishmaniasis are also being reported. For the simultaneous estimation of AN and AA in the callus
Ines Klingelhöfer et al.
Journal of chromatography. A, 1360, 288-295 (2014-08-26)
The traditional direct bioautography workflow was substantially altered to yield narrow, sharp-bounded effective zones. For the first time, microorganisms quantitatively detected the single effective compounds in complex samples, separated in parallel on a planar chromatogram. This novel effect-directed workflow was
Sockalingam Anbazhagan et al.
Journal of pharmaceutical and biomedical analysis, 39(3-4), 801-804 (2005-06-14)
In the present study, simultaneous quantification of stavudine (SV), lamivudine (LV) and nevirapine (NV) in tablets by UV spectroscopy, reverse phase HPLC (RP-HPLC) and HPTLC methods were developed. In the UV multi-component spectral method, SV, LV and NV was quantified
Shashi Shankar Tiwari et al.
Biomedical chromatography : BMC, 26(1), 61-68 (2011-03-18)
Picroside-I and picroside-II are known bioactive metabolites in Picrorhiza species. In the present study a simple, precise method has been established for the simultaneous determination of picrosides (picroside-I and picroside-II) in two different Picrorhiza species, P. kurroa and P. scrophulariiflora.
Shota Miyazaki et al.
Journal of chromatography. A, 1218(15), 1988-1994 (2010-12-24)
Chromatographic properties of a new type of monolithic silica rod columns were examined. Silica rod columns employed for the study were prepared from tetramethoxysilane, modified with octadecylsilyl moieties, and encased in a stainless-steel protective column with two polymer layers between
Irena Vovk et al.
Journal of chromatography. A, 1218(20), 3089-3094 (2011-04-19)
The separation of structurally related angiotensin-converting enzyme (ACE) inhibitors lisinopril, cilazapril, ramipril and quinapril and their corresponding active diacid forms (prilates) by conventional TLC silica gel 60 plates was contrasted with that afforded by monolithic ultra-thin-layer chromatographic (UTLC) plates. For
Eman Alzahrani et al.
The Analyst, 137(20), 4751-4759 (2012-08-21)
Silica-based monolithic materials have shown great promise for use as sorbent materials due to their large surface area and bimodal pore size distribution. In this paper, a new process for the fabrication of a silica-based monolith inside a glass microchip
Ibrahim A Naguib et al.
European journal of medicinal chemistry, 45(9), 3719-3725 (2010-06-12)
Validated sensitive and highly selective stability indicating methods are adopted for simultaneous quantitative determination of sulpiride and mebeverine hydrochloride in presence of their reported impurities and hydrolytic degradates whether in pure forms or in pharmaceutical formulation. The first method is
Arianne Soliven et al.
Journal of chromatography. A, 1217(39), 6085-6091 (2010-08-25)
This study investigates the synthesis and chromatographic behaviour of an analytical size cyanopropyl "cyano" bonded silica monolith. Surface modification was undertaken by treating a neat silica monolith with chloro(3-cyanopropyl)dimethyl silane in dry heptane over a two day period. The resulting
Qi-Shu Qu et al.
Analytica chimica acta, 609(1), 76-81 (2008-02-05)
The octadecylamine-capped gold nanoparticles (ODA-Au-NPs) were prepared and directly used to coat the capillary wall. The hydrophobic coating acted as the stationary phase for open-tubular gas chromatography (OTGC). The ODA-Au-NPs can be adsorbed tightly onto the inner surface of fused
Hong Wang et al.
Biomedical and environmental sciences : BES, 21(5), 438-441 (2009-01-13)
To determine the visible light-induced photodegradation kinetics of two xanthene photosensitizers, phloxine B and uranine, in solution and on the surface of silica TLC plates, and to examine the phototoxicity of residues of degradation, which could provide valuable safety data
Fabián H Navarro et al.
Analytica chimica acta, 948, 104-112 (2016-11-23)
In the present study, porous silica particles as well as impervious fused-silica wafers and capillary tubes were modified with hydrophilic polymers (hydroxylated polyacrylamides and polyacrylates), using a surface-confined grafting procedure based on atom transfer radical polymerization (ATRP) which was also
Eglal A Abdelaleem et al.
Journal of pharmaceutical and biomedical analysis, 114, 22-27 (2015-05-23)
Two chromatgraphic methods were developed for determination of Paracetamol (PCM) and Pamabrom (PAM) in presence of P-aminophenol (PAP) and Theophylline (THEO) as potential impurities of both drugs respectively. First method is HPTLC which depends on separation and quantitation of the
Shadab Ahmad Pathan et al.
Phytochemical analysis : PCA, 21(3), 219-223 (2009-10-29)
Safranal is an effective anticonvulsant shown to act as an agonist at GABA(A) receptors. Nose to brain delivery via nanoparticle formulation might improve its brain delivery. A selective and sensitive analytical method is required for evaluation of safranal-based novel drug
Silvia Rocchi et al.
Journal of chromatography. A, 1381, 149-159 (2015-01-24)
A novel sub-2 μm chiral stationary phase (CSP) was prepared immobilizing vancomycin onto 1.8 μm diol hydride-based silica particles. The CSP was packed into fused silica capillaries of 75 μm i.d. with a length of 11 cm and evaluated by
Qishu Qu et al.
Journal of chromatography. A, 1399, 25-31 (2015-05-09)
A simple coating procedure employing a multilayer-by-multilayer process to modify the inner surface of bare fused-silica capillaries with silica nanoparticles was established. The silica nanoparticles were adsorbed onto the capillary wall via a strong electrostatic interaction between amino functional groups
Alamgir A Dar et al.
Journal of pharmaceutical and biomedical analysis, 100, 300-308 (2014-09-10)
Chemical investigation of Codonopsis ovata resulted in the isolation and identification of β-sitosterol-3-O-glycoside, luteolin, apigenin, gentiacaulein, swertiaperenine, β-sitosterol, taraxeryl-3-acetate, and 3β-acetoxyoleanane-12-one. A rapid, precise, sensitive and validated HPTLC method for simultaneous quantification of these natural products (NPs) was developed on
C Karlsson et al.
Journal of chromatography. A, 897(1-2), 349-363 (2000-12-29)
Enantiomeric separation of chiral pharmaceuticals is carried out in aqueous and non-aqueous packed capillary electrochromatography (CEC) using a teicoplanin chiral stationary phase (CSP). Capillaries were slurry packed with 5 microm 100-A porous silica particles modified with teicoplanin and initially evaluated
E Tamac et al.
Nigerian journal of clinical practice, 21(9), 1177-1181 (2018-08-30)
The aim of this study was to evaluate the effects of the different sized alumina particles (50 and 150 μm) and tribochemical silica-modified alumina particles (110 μm) on titanium (Ti) surface to identify the most effective method of increasing the
Qin Hu et al.
Electrophoresis, 32(20), 2867-2873 (2011-09-29)
A fused-silica capillary modified with Fe³⁺-immobilized magnetic nanoparticles (Fe³⁺-IMAN) has been investigated for the capillary electrophoretic (CE) separation of phosphoproteins and non-phosphoproteins. The Fe³⁺-IMAN capillary was achieved by covalently immobilising epoxy-based magnetic silica nanoparticles (160 nm) on the prederivatized 3-aminopropyl-trimethoxysilane (APTMS)
Di Zhou et al.
Journal of chromatography. A, 1627, 461423-461423 (2020-08-22)
A novel stationary phase co-modified with N-isopropyl acrylamide (NIPAM) and 3-aminophenylboronic acid copolymer on the silica was synthesized through atom transfer radical polymerization (ATRP) reaction for performing mixed-mode and boronate affinity chromatography. The prepared functionalized silica was characterized using Fourier
Yun Tian et al.
Electrophoresis, 29(4), 960-970 (2008-01-24)
A novel calix[4] open-chain crown ether (p-tert-butylcalix[4]arene-1,3-bis(allyloxyethy) ether)-modified, organic-inorganic hybrid silica-based monolithic column possessing vinyl ligands for CEC is described. The monolithic silica matrix containing a vinyl functionality was synthesized by in situ cocondensation of tetramethoxysilane (TMOS) and vinyltrimethoxysilane (VTMS)
Wanying Li et al.
Mikrochimica acta, 187(6), 328-328 (2020-05-15)
Based on a detailed study of the hydrolysis process of tetrabutyl orthotitanate (TBOT), TiO2 nanoclusters were modified inside the pores of SiO2 core-shell particles instead of the outside. The pore size distribution of SiO2 core-shell spheres modified with TiO2 (SiO2@dSiO2@TiO2) was
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