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concentrating zone tlc plates
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Keyword:'concentrating zone tlc plates'
Showing 1-30 of 80 results for "concentrating zone tlc plates" within Papers
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
Wioleta Jesionek et al.
Journal of AOAC International, 98(4), 1013-1020 (2015-08-14)
Fast high-throughput TLC-direct bioautography (DB) is an effect-directed analysis method that enables searching for biologically active (e.g., antimicrobial) substances in complex mixtures like plant extracts. The principle of the method is that separation and detection of biological properties of given
Lucy Owen et al.
Phytochemical analysis : PCA, 30(2), 121-131 (2018-10-04)
The antimicrobial activity of many essential oils (EOs) is well established, indicating that EOs may be a source of compounds for antimicrobial drug development. Thin layer chromatography-direct bioautography (TLC-DB) can quickly identify antimicrobial components in complex mixtures and can be
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
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
Corinne Houart et al.
Neuron, 35(2), 255-265 (2002-08-06)
Cells at the anterior boundary of the neural plate (ANB) can induce telencephalic gene expression when transplanted to more posterior regions. Here, we identify a secreted Frizzled-related Wnt antagonist, Tlc, that is expressed in ANB cells and can cell nonautonomously
Ioana Anamaria Sima Tuhuţiu et al.
Talanta, 114, 117-123 (2013-08-21)
A highly sensitive and selective thin layer chromatographic (TLC) method was developed for simultaneous determination of catecholamines and their related drugs using a new detection method and digital image processing of chromatographic plates. For the quantitative evaluation of the investigated
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)
Jinge Zhou et al.
Phytochemical analysis : PCA, 28(2), 115-124 (2016-12-29)
TLC bioautography for tyrosinase inhibitors has made recent progress; however, an assay with a relative low consumption of enzyme and quantitative capability would greatly advance the efficacy of related TLC bioautographic assays. An improved TLC bioautographic assay for detecting tyrosinase
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
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
Venkatesan Kumar et al.
Phytochemical analysis : PCA, 19(3), 244-250 (2007-11-13)
A new, simple, sensitive, selective and precise HPTLC method has been developed for the determination of taraxerol in Clitoria ternatea L. Determination of taraxerol was performed on TLC aluminium plates. Linear ascending development was carried out in twin trough glass
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
E Sangiorgi et al.
Journal of chromatography. B, Biomedical sciences and applications, 693(2), 468-478 (1997-06-06)
The multistep analytical procedure routinely applied in our laboratory for the detection of the aryl amine beta-agonists clenbuterol, mabuterol and mapenterol in bovine matrices has been extended to the analysis in urine samples of brombuterol, a new clenbuterol-like compound. In
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
L H Gu et al.
Journal of chromatography. A, 1411, 116-122 (2015-08-19)
A thin-layer chromatography (TLC)-bioautographic method was developed with the aim to detect dipeptidyl peptidase IV (DPP IV) inhibitors from plant extracts. The basic principle of the method is that the enzyme (DPP IV) hydrolyzes substrate (Gly-Pro-p-nitroaniline) into p-nitroaniline (pNA), which
C Giachetti et al.
European journal of drug metabolism and pharmacokinetics, 21(3), 261-268 (1996-07-01)
N-(2-hydroxyethyl)-pyrrolidine (HEP, Epolamine) is a strong base used to salify organic acids of pharmaceutical interest in order to improve their solubility in water. Diclofenac-HEP (Flector) is the first example of an epolamine salt of a drug. In this study, [14C]-HEP
J Müthing et al.
Glycoconjugate journal, 14(1), 19-28 (1997-01-01)
In this study the comparative TLC immunostaining investigation of neutral GSLs and gangliosides from human skeletal and heart muscle is described. A panel of specific polyclonal and monoclonal antibodies as well as the GM1-specific choleragenoid were used for the overlay
Nada S Abdelwahab et al.
Journal of chromatographic science, 53(4), 484-491 (2014-07-14)
Two accurate, selective and precise chromatographic methods, namely thin-layer chromatography (TLC)-densitometric method and reversed phase high-performance liquid chromatography (RP-HPLC) method, were developed and validated for the simultaneous determination of tolfenamic acid (TOL) and its two major impurities, 2-chlorobenzoic acid (CBA)
Jürgen Weisser et al.
Experimental cell research, 279(1), 1-13 (2002-09-06)
Differentiation and growth of chondrocytes in fetal growth plates of vertebrate long bones and ribs appear to occur in a gradual, continuous manner between the resting zone through the proliferation zone, maturation zone, and upper and lower hypertrophic zones, with
Michel Y Fares et al.
Journal of chromatographic science, 55(9), 961-968 (2017-10-20)
Two accurate, precise and highly selective stability-indicating methods were adopted for simultaneous determination of benztropine mesylate (BNZ) in presence of its hepatotoxic and carcinogenic degradation product, benzophenone (BPH) either in pure form or in the pharmaceutical formulation without any preliminary
Osamu Kiguchi et al.
Journal of chromatography. A, 1370, 246-254 (2014-12-03)
To assess food safety emergencies caused by highly hazardous chemical-tainted foods, simultaneous analysis of organophosphorus insecticides in fatty foods such as precooked foods was conducted using thin-layer chromatography/direct analysis in real time time-of-flight mass spectrometry (TLC/DART-TOFMS) and isotope dilution technique.
Leptin regulates chondrocyte differentiation and matrix maturation during endochondral ossification.
Yuki Kishida et al.
Bone, 37(5), 607-621 (2005-07-26)
Leptin has been suggested to mediate a variety of actions, including bone development, via its ubiquitously expressed receptor (Ob-Rb). In this study, we investigated the role of leptin in endochondral ossification at the growth plate. The growth plates of wild-type
M Wilson et al.
Current microbiology, 25(2), 77-81 (1992-08-01)
Twenty-seven compounds were screened for their ability to sensitize Streptococcus sanguis to killing by light from a 7.3-mW Helium/Neon (HeNe) laser. Bacteria were mixed with various concentrations of the test compounds, spread over the surfaces of agar plates, and then
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
Aaron C McDonald et al.
Bone, 33(5), 788-797 (2003-11-19)
The neuropeptide galanin (GAL) has recognized physiological actions in the nervous system and other tissues, but there is no documented evidence of GAL influencing normal or pathological bone metabolism. GAL expression, however, is upregulated in central and peripheral nerves following
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
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
Wei Zeng et al.
Applied microbiology and biotechnology, 97(5), 2163-2172 (2013-01-31)
Poly(γ-glutamic acid) (γ-PGA) is a promising biomaterial with a wide range of unique applications. To extensively screen γ-PGA-producing bacteria with high yield and different molecular weight, we developed an integrated high-throughput strategy. Firstly, γ-PGA-producing bacteria were selected in a primary
Takeshi Minashima et al.
The Journal of biological chemistry, 287(18), 14803-14815 (2012-03-09)
Annexin A6 (AnxA6) is highly expressed in hypertrophic and terminally differentiated growth plate chondrocytes. Rib chondrocytes isolated from newborn AnxA6-/- mice showed delayed terminal differentiation as indicated by reduced terminal differentiation markers, including alkaline phosphatase, matrix metalloproteases-13, osteocalcin, and runx2
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