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modified silica hptlc plates
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关键词:'modified silica hptlc plates'
显示 1-30 共 85 条结果 关于 "modified silica hptlc plates" 范围 论文
Densitometric HPTLC Methods for Qualitative and Quantitative Analysis of Carvone, Dillapiole, Methylparaben and Propylparaben in Dill, Caraway seeds and Pharmaceutical Formulations Utilizing Normal and Reversed-Phase Silica Gel Plates
Alam P, et al.
FABAD Journal of Pharmaceutical Sciences, 38(1), 33-48 (2013)
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
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
Yongde Yue et al.
Journal of AOAC International, 91(5), 1210-1217 (2008-11-05)
The separation of 9 organophosphates (monocrotophos, quinalphos, triazophos, parathion-methyl, isofenphos-methyl, temephos, parathion, phoxim-ethyl, and chlorpyrifos) by high-performance thin-layer chromatography (HPTLC) with automated multiple development was studied. The HPTLC method was developed and validated for analysis of residues of phoxim-ethyl and
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
Urška Jug et al.
Journal of chromatography. A, 1637, 461802-461802 (2021-01-01)
A methodology based on off-line multidimensional thin-layer chromatography was developed for isolation of several secondary metabolites from bark of Japanese knotweed (Fallopia japonica Houtt.) rhizomes. Successive fractionation steps using PLC silica gel and HPTLC silica gel or HPTLC cellulose plates
P De Saqui-Sannes et al.
Journal of analytical toxicology, 20(3), 185-188 (1996-05-01)
In an attempt to improve the sensitivity and selectivity of thin-layer chromatographic analysis for the detection of strychnine and crimidine in biological samples, a rapid high-performance thin-layer chromatographic (HPTLC) method with densitometry is described. Fortified dog serum and stomach content
Chaitali Das et al.
Phytochemical analysis : PCA, 16(2), 90-92 (2005-05-11)
A simple high-performance thin-layer chromatographic (HPTLC) method has been developed for the simultaneous determination of the pharmacologically important quinazoline alkaloids vasicine and vasicinone in Adhatoda vasica. The assay combines the separation and quantification of the analytes on silica gel 60
Andreas Schoenborn et al.
Journal of chromatography. A, 1530, 185-191 (2017-11-18)
The planar yeast estrogen screen (p-YES) can serve as a highly valuable and sensitive screening tool for the detection of estrogenic compounds in various sample matrices such as water and wastewater, personal care products and foodstuff. The method combines the
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
Smita V Londhe et al.
Journal of AOAC International, 96(1), 24-26 (2013-03-22)
An HPTLC method was developed and validated for simultaneous determination of stevioside (STE) and rebaudioside-A (REB-A) in Stevia rebaudiana leaves. The HPTLC separation was performed on precoated silica gel 60F254 HPTLC plates with the mobile phase ethyl acetate-ethanol-acetone-water (15 +
Vesna Glavnik et al.
Journal of chromatography. A, 1598, 196-208 (2019-04-02)
We developed the first four HPTLC methods for the separation of proanthocyanidins according to degree of polymerization on HPTLC diol F254S plates. Acetonitrile, ethyl acetate, ethyl acetate-formic acid (9:0.1, v/v) and toluene-acetone-formic acid (3:6:1, v/v) were used as developing solvents
Javed Ahamad et al.
Journal of chromatographic science, 53(7), 1203-1209 (2014-12-20)
Gymnemic acid and charantin are well-established antidiabetic phytosterols found in Gymnema sylvestre and Momordica charantia, respectively. The fact that these plants are often used together in antidiabetic poly-herbal formulations lured us to develop an HPTLC densitometric method for the simultaneous
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
Rakesh K Patel et al.
Journal of AOAC International, 91(2), 339-343 (2008-05-15)
A selective, precise, and accurate high-performance thin-layer chromatographic (HPTLC) method has been proposed for the analysis of conessine in Holarrhena antidysenterica. The method involves visible densitometric evaluation of conessine resolving it by HPTLC on aluminium-based silica gel plates. For visible
Ute Jautz et al.
Journal of chromatography. A, 1128(1-2), 244-250 (2006-07-28)
HPTLC/MS by a plunger-based extraction device was shown to be an appropriate technique for quantitative planar chromatography, even in trace analysis. Reproducible extraction from silica gel phases in the lower-pg range distinguishes this technique from other approaches. Repeatability of the
Syed Ghulam Musharraf et al.
Journal of pharmaceutical and biomedical analysis, 56(2), 240-245 (2011-06-17)
A high performance thin-layer chromatographic (HPTLC) method for the simultaneous determination of the hypolipidemic agents, E- and Z-isomers of guggulsterone in Commiphora mukul resin, guggulipid (ethyl acetate extract of resin), and its pharmaceutical formulation, was developed. The developed system was
Silvia A Coran et al.
Journal of pharmaceutical and biomedical analysis, 70, 647-651 (2012-07-31)
A novel HPTLC-densitometric method was developed for separation and quantitation of primulasaponin I and II in different matrices. HPTLC silica gel 60 F254(S), 20 cm × 10 cm, plates with ethyl acetate:water:formic acid (5:1:1 v/v) as the mobile phase were
J G Alvarez et al.
Journal of chromatography, 615(1), 142-147 (1993-05-19)
Analysis of the various lipids in amniotic fluid by multisample semiautomated quantitative high-performance thin-layer chromatography (HPTLC) is presented. Amniotic fluid (AF) lipids are extracted by liquid-liquid partition with chloroform-methanol (C-M) (final C-M-AF ratio of 4:2:1, v/v), 4-microliters aliquots of the
Anuradha S Upadhye et al.
BMC complementary and alternative medicine, 18(1), 16-16 (2018-01-18)
Alpinia galanga (L.) Willd. commonly called as Rasna, Greater galangal or Kulinjan is a medicinally important rhizome used in Indian traditional system of medicine to cure a number of ailments. A. galanga is the main source of a galangin -a
Imran Khan et al.
Journal of separation science, 35(3), 392-399 (2012-01-04)
A sensitive, selective and robust densitometric high-performance thin-layer chromatographic method was developed and validated for five marker compounds, namely betulin, lupeol, oleanolic acid, 3-acetyloleanolic acid and β-sitosterol, known for their various therapeutic activities. The marker compounds have been isolated from
B Simonovska et al.
Journal of chromatography. A, 903(1-2), 219-225 (2001-01-12)
A high-performance thin-layer chromatographic (HPTLC) method for the determination of the two main potato glycoalkaloids, alpha-chaconine and alpha-solanine, in different parts of the potato plant, is described. Samples were extracted with diluted aqueous acetic acid containing the ion-pairing reagent 1-pentanesulfonic
Amira F El-Yazbi et al.
Journal of chromatographic science, 55(5), 497-507 (2017-02-17)
Two simple, direct and environment-friendly chromatographic methods, high-performance liquid chromatography (HPLC) and high-performance thin layer chromatographic (HPTLC), were developed for the determination of a binary mixture of fish oil (FO) and wheat germ oil (WGO), for the first time, in
Etil Guzelmeric et al.
Journal of pharmaceutical and biomedical analysis, 132, 35-45 (2016-10-04)
Chamomile tea composed of dried flower heads of Matricaria recutita L. (Asteraceae) is one of the most popular single ingredient herbal teas. Tea industries, spice shops or public bazaars are mostly supplied chamomile as a raw material via cultivation or
Etil Guzelmeric et al.
Journal of pharmaceutical and biomedical analysis, 107, 108-118 (2015-01-13)
Brewed tea of chamomile flowers (Matricaria recutita L.) (Asteraceae) has been extensively consumed for centuries due to either its pleasant taste or medicinal purposes. On the other hand, the major problem is difficulty in distinguishing the genuine specimen when supplying
V George et al.
Journal of food science and technology, 47(4), 408-413 (2010-08-01)
A solid phase extraction method using C18 cartridges was standardized for the isolation of multiple sweeteners (aspartame, acesulfame-K and saccharin) and their degradation products (diketopiperazine, Lphenylalanine, acetoacetamide and 2-sulfobenzoic acid) from lassi. Analytical conditions for HPLC were standardized over C18
Sigrid Mennickent et al.
Journal of separation science, 32(9), 1454-1458 (2009-03-31)
An instrumental planar chromatographic (HPTLC) method for quantification of carbamazepine in human serum was developed using liquid-liquid extraction with dichloromethane, fluorescence activation with perchloric acid 60%/ethanol/water (1:1:1, v/v) and fluorescence detection. Planar chromatographic separation was performed on precoated silica gel
Vikas Jaitak et al.
Journal of pharmaceutical and biomedical analysis, 47(4-5), 790-794 (2008-05-06)
A high-performance thin-layer chromatographic (HPTLC) method was developed and validated as per ICH (International Conferences on Harmonization) guidelines for simultaneous quantification of three steviol glycosides, i.e. steviolbioside, stevioside and rebaudioside-A in Stevia rebaudiana leaves. For achieving good separation, mobile phase
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
Sameh Ahmed et al.
Journal of chromatographic science, 55(8), 818-831 (2017-05-10)
A comparative force degradation high performance thin layer chromatography (HPTLC) method was developed and validated for some H2-receptor antagonists. The studied H2-receptor antagonists were ranitidine (RAN), nizatidine (NIZ) and famotidine (FAM). The degradation behaviors of the studied H2-receptor antagonists were
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