High-Performance Thin-Layer Chromatographic Determination of Aceclofenac in the Bulk Drug and in Pharmaceutical Preparations

JPC – Journal of Planar Chromatography – Modern TLC -     

Laser-Induced Hydrogen Radical Removal in UV MALDI-MS Allows for the Differentiation of Flavonoid Monoglycoside Isomers

Negative-ion matrix-assisted laser desorption/ionization (MALDI) time-of-flight mass spectra and tandem mass spectra of flavonoid mono-O-glycosides showed the irregular signals that were 1 and/or 2 Da smaller than the parent deprotonated molecules ([M – H]^–) and the sugar-unit lost fragment ions ([M – Sugar – H]^–). The 1 and/or 2 Da mass shifts are generated with the removing of a neutral hydrogen radical (H*), and/or with the homolytic cleavage of the glycosidic bond, such as [M – H* – H]^–, [M – Sugar – H* – H]^–, and [M – Sugar – 2H* – H]^–. It was revealed that the hydrogen radical removes from the phenolic hydroxy groups on the flavonoids, not from the sugar moiety, because the flavonoid backbones themselves absorb the laser. The glycosyl positions depend on the extent of the hydrogen radical removals and that of the homolytic cleavage of the glycosidic bonds. Flavonoid mono-glycoside isomers were distinguished according to their TOF MS and tandem mass spectra.

UTLC of Flavonols in Sambucus nigra Flowers

JPC – Journal of Planar Chromatography – Modern TLC -     

Micro Brushes as Samplers in Analytical PLC

JPC – Journal of Planar Chromatography – Modern TLC -     

Chromatographic Analysis of trans and cis-Citral in Lemongrass Oil and in a Topical Phytonanocosmeceutical Formulation,and Validation of the Method

JPC – Journal of Planar Chromatography – Modern TLC -     

HPTLC Assessment of Phenolic Extractives in Selected Extraneous Woods

JPC – Journal of Planar Chromatography – Modern TLC -     

A Sensitive and Specific High-Performance Thin-Layer Chromatography—Densitometry Method for Determination of Rebamipide in the Bulk Material and in Pharmaceutical Formulation

JPC – Journal of Planar Chromatography – Modern TLC -     

A New Way of Using Chemiluminescence in Thin-Layer Chromatography

JPC – Journal of Planar Chromatography – Modern TLC -     

High-Performance Thin-Layer Chromatographic Detection of Profenofos in Biological Materials

JPC – Journal of Planar Chromatography – Modern TLC -     

Stability-Indicating HPTLC Method of Carteolol in Bulk Drug and in Pharmaceutical Dosage Forms

JPC – Journal of Planar Chromatography – Modern TLC - A sensitive, selective, precise and stability-indicating high-performance thin-layer chromatography (HPTLC) method was developed...     

Use of Photocatalytic Reactions to Visualize Drugs in TLC

JPC – Journal of Planar Chromatography – Modern TLC -     

Thin-Layer Chromatography for Selective Detection of Methomyl in Forensic Casework

JPC – Journal of Planar Chromatography – Modern TLC -     

Isolation and Identification of Amphetamines in Urine by Thin-Layer Chromatography

JPC – Journal of Planar Chromatography – Modern TLC -     

Analysis of Ebastine in Pharmaceutical Preparations by High-Performance Thin-Layer Chromatography

JPC – Journal of Planar Chromatography – Modern TLC -     

Thin-Layer Chromatographic Monitoring of Sonolytic Degradation of Surfactants in Wastewaters

JPC – Journal of Planar Chromatography – Modern TLC -     

HPTLC Determination of Antioxidants in the Polymer Container of Parenteral Infusion Fluid

JPC – Journal of Planar Chromatography – Modern TLC -     

Quantification of Puerarin in Pueraria tuberosa DC. by High-Performance Thin-Layer Chromatography

JPC – Journal of Planar Chromatography – Modern TLC -     

Quantitative Analysis of Nimesulide in Plasma by Thin-Layer Chromatography: Application to Pharmacokinetic Studies in Man

JPC – Journal of Planar Chromatography – Modern TLC - A thin-layer chromatographic (TLC) method for quantitative analysis of nimesulide in human plasma has been developed, validated,...     

Protection of carbon steel with superhydrophobic coating against corrosion in NaCl solution

Corrosion and kinetics of partial electrode reactions on carbon steel St3 with superhydrophobic coatings of three types were studied in 0.5 M NaCl and 50 g/L NaCl +400 mg/L H₂S solutions. The investigations were carried out on electrodes made of carbon steel St3 with a chemical composition, wt. %: C – 0.20; Mn – 0.50; Si – 0.15; P – 0.04; S – 0.05; Cr – 0.30; Ni – 0.20; Cu – 0.20, and Fe – 98.36. To obtain the type I coating, the metal surface was textured by an IR laser radiation of nanosecond duration followed by chemisorption of fluorobutylsilane out of a solution in n-decane. To obtain a coating of type II, a nanoscale composite layer consisting of aggregates of aerosil nanoparticles was applied additionally to the outcome of type I method. To obtain a coating of type III, the metal surface after being textured by the infrared (IR) laser radiation of nanosecond duration was followed by chemisorption of fluoroxy silane. The influence of duration τ of the medium corrosive impact on protective effect of the superhydrophobic coating is considered. It was shown that upon reaching a steady state (after 72 h), the corrosion rate of steel with a superhydrophobic coating of I and II types in a 0.5 M NaCl solution is reduced by 23 ± 3 times compared with unprotected samples. Approximately the same picture is characteristic of electrodes with a coating of type III in a solution of 50 g/L NaCl +400 mg/L H₂S.     

Multidimensional Relay Development in TLC

JPC – Journal of Planar Chromatography – Modern TLC - A new mode of development for TLC, multidimensional relay development, developed on the basis of half-way and relay development, is...