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modified silica tlc plates
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Keyword:'modified silica tlc plates'
Showing 1-30 of 97 results for "modified silica tlc plates" within Papers
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
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
Aman D Kaur et al.
Journal of pharmaceutical and biomedical analysis, 46(2), 391-394 (2007-11-17)
A new, simple, sensitive, precise and robust high-performance thin layer chromatographic (HPTLC) method was developed for the estimation of conessine in herbal extracts and pharmaceutical dosage forms. Analysis of conessine was performed on TLC aluminium plates pre-coated with silica gel
Joseph A Kraai et al.
Journal of chromatography. A, 1591, 162-170 (2019-01-27)
This study showed that a nanostructured, highly-porous stationary phase composed of randomly-deposited biosilica frustules isolated from living cells of diatom Pinnularia sp. significantly improved the conventional thin-layer chromatography (TLC) based separation of the triphenylmethane dyes malachite green and fast green
S R Jim et al.
Journal of chromatography. A, 1218(40), 7203-7210 (2011-09-09)
Ultrathin-layer chromatography (UTLC) provides the high sensitivities and rapid separations over short distances desirable in many analytical applications. The dependence of these performance benefits on UTLC layer microstructure motivates continued stationary phase engineering efforts. A new method of modifying the
J Z Hall et al.
Journal of chromatography. A, 1266, 168-174 (2012-11-03)
Reversed phase thin layer chromatography (TLC) or high performance thin layer chromatography (HPTLC) plates modified with C18, C8 or C2 to provide the silica-gel stationary phase with different polarities are available on the market, however, reversed phase plates with tunable
Sy-Chyi Cheng et al.
Analytical chemistry, 81(22), 9274-9281 (2009-11-17)
The combination of laser-induced acoustic desorption and electrospray ionization mass spectrometry (LIAD/ESI/MS) can be used to rapidly characterize chemical compounds separated on a thin layer chromatography (TLC) plate. We performed LIAD analysis by irradiating the rear side of an aluminum-based
Vesna Glavnik et al.
Journal of chromatography. A, 1482, 97-108 (2016-12-31)
On-line elution based TLC-MS is now a well-established technique, but the quality of the data obtained can sometimes be hampered by a severe spectral background or by strong ion suppression, especially when silica gel plates are used in combination with
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
Alaa Khedr et al.
Journal of chromatographic science, 41(1), 10-16 (2003-02-25)
A validated stability-indicating thin-layer chromatographic (TLC) method of the analysis of azithromycin (AZT) in bulk and capsule forms is developed. Both AZT potential impurity and degradation products can be selectively and accurately estimated in both raw material and product onto
Balamurali Kannan et al.
Journal of chromatography. A, 1218(52), 9406-9413 (2011-11-29)
A simple, elegant method for the formation of a continuous stationary phase gradient for use in chromatographic separations is described. Its applicability to separation science is demonstrated using thin-layer chromatography as a test case. Gradient stationary phases were formed on
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
D R Kodali et al.
Chemistry and physics of lipids, 52(3-4), 163-170 (1990-02-01)
The acyl migration of 1,2-dipalmitoyl-sn-glycerol (1,2-DPG) to 1,3-dipalmitoylglycerol (1,3-DPG) in different states, neat, in the presence of egg yolk lecithin (sonicated and unsonicated) and on silica gel was studied. The isomerization was quantitated by scanning densitometry of charred TLC plates
Saviana Di Giovanni et al.
European journal of pharmaceutical sciences : official journal of the European Federation for Pharmaceutical Sciences, 33(2), 109-119 (2007-12-18)
Acetylcholinesterase inhibitors (AChEI) are currently still the best available pharmacotherapy for Alzheimer patients. Successful screening for new AChEI relies on effective and fast assays. Two colorimetric screening assays frequently used to search for new AChEI, namely a thin layer chromatography
Justine Ferey et al.
Journal of chromatography. A, 1477, 108-113 (2016-12-04)
This paper presents a kinetic study of invertase, a specific fructofuranosidase cloned from the Leishmania major genome. The kinetic parameters of the β-d-fructofuranosidase from Leishmania major (BfrA) were determined using Thin-Layer Chromatography (TLC) and UV-densitometry (TLC@UV) specifically developed for the
Wenfang Gao et al.
Journal of chromatographic science, 53(5), 811-815 (2014-08-26)
1-Octacosanol is a straight-chain aliphatic 28-carbon fatty alcohol with well-known anti-fatigue function. In this study, 1-octacosanol was extracted from Antarctic krill for the first time. Separation of 1-octacosanol was achieved using high-performance thin-layer chromatography (TLC) with a mobile phase consisting
Loretta Pobłocka-Olech et al.
Acta pharmaceutica (Zagreb, Croatia), 68(2), 199-210 (2018-04-28)
Flavonoids in the buds of eight Populus species and hybrids were detected and compared with the aid of an optimized TLC method. Separation of 17 flavonoid aglycones belonging to different groups, namely, flavones, flavonols, flavanones and flavanonols, previously described as
Nariman A El-Ragehy et al.
Journal of chromatographic science, 52(6), 559-565 (2013-06-05)
In this work, two chromatographic methods have been developed and validated for the determination of sertindole (an antipsychotic agent) in the presence of its oxidative degradation product. Sertindole was subjected to stress stability studies, including acid, alkali, oxidative, photolytic and
Toni E Newsome et al.
Journal of chromatography. A, 1364, 261-270 (2014-09-15)
Nanofibrous silica-based stationary phases for electrospun ultra-thin layer chromatography (E-UTLC) are described. Nanofibers were produced by electrospinning a solution of silica nanoparticles dispersed in polyvinylpyrrolidone solutions to create composite silica/polymer nanofibers. Stationary phases were created from as-spun nanofibers, or the
Mercè Bonfill et al.
Biomedical chromatography : BMC, 20(2), 151-153 (2005-10-06)
The identification of the four principal triterpenoid components of Centella asiatica has been achieved by TLC on silica gel plates and mass spectrometry, as a modification of the method described in the European Pharmacopoeia (5th edn). A combination of ethyl
Monika Dąbrowska et al.
Biomedical chromatography : BMC, 29(3), 388-395 (2014-07-22)
A rapid, accurate and sensitive thin-layer chromatography (TLC) method with densitometric detection has been developed and validated for the determination of cefepime in pharmaceuticals. Chromatographic separation was achieved on a silica gel TLC F254 plates with a mobile phase consisting
G Bieniek et al.
British journal of industrial medicine, 38(3), 304-306 (1981-08-01)
The separation of hippuric and m-methylhippuric acid as toluene and m-xylene metabolites present in urine of people exposed simultaneously to toluene and xylene is described. Chloroform was used for hippuric and m-methylhippuric acid extraction. Satisfactory separation of these metabolites was
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
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
A Kokotkiewicz et al.
Food chemistry, 221, 535-540 (2016-12-17)
Thin layer chromatographic methods for quantitative determination of nightshade-specific tropane (l-hyoscyamine, scopolamine) and steroidal alkaloids (α-solanine, α-chaconine) in goji berries (L. barbarum L., Solanaceae) were developed. The analysis of tropane derivatives included separation on silica gel-coated HPTLC plates using mobile
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
J S Zhang et al.
Journal of pharmaceutical and biomedical analysis, 48(3), 1024-1028 (2008-08-30)
The rhizomes of Curcuma phaeocaulis, Curcuma kwangsiensis, Curcuma wenyujin and Curcuma longa are used as Ezhu or Jianghuang in traditional Chinese medicine for a long time. Due to their similar morphological characters, it is difficult to distinguish their origins of
Nour E Wagieh et al.
Drug testing and analysis, 2(3), 113-121 (2010-09-30)
Sensitive and validated UV-spectrophotometric, chemometric and TLC-densitometric methods were developed for determination of triamterene (TRM) and xipamide (XIP) in their binary mixture, formulated for use as a diuretic, without previous separation. Method A is the isoabsorptive point spectrophotometry, in which
Prinjaporn Tee-ngam et al.
Sensors (Basel, Switzerland), 13(10), 13039-13053 (2013-10-01)
Ferulic acid is an important phenolic antioxidant found in or added to diet supplements, beverages, and cosmetic creams. Two designs of paper-based platforms for the fast, simple and inexpensive evaluation of ferulic acid contents in food and pharmaceutical cosmetics were
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
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