The Potential of BioArena in the Study of the Formaldehydome

JPC – Journal of Planar Chromatography – Modern TLC - New results with BioArena as a complex separation and detection (evaluation) system support earlier observations that formaldehyde...     

Identification of the aromatic hydroxylamine group by mass spectrometry

The mass spectra of aromatic hydroxylamines are diagnostic; [M], [M – 2], [M – 16] and, in most instances, [M – 17] ions are observed.     

Erratum to: Analysis of the Yperite Block Fished up from the Baltic Sea

JPC – Journal of Planar Chromatography – Modern TLC -     

Determination of the Lipophilicity of Bioactive 2-Phenylbenzothiazoles by RPTLC

JPC – Journal of Planar Chromatography – Modern TLC -     

Intra-Specific Variation of Precocene I in the Wild Population of Ageratum conyzoides L. from the Western Himalayas

JPC – Journal of Planar Chromatography – Modern TLC -     

Determination of the Lipophilicity of Xanthines by Reversed-Phase Liquid Chromatography

JPC – Journal of Planar Chromatography – Modern TLC -     

Visualization reagent for the identification of phthalates

JPC – Journal of Planar Chromatography – Modern TLC -     

Preparation of optically active cyclohexenones: Chirons for the lipophilic moiety of flowery- and woody-like odorant ketones

Optically active 2,5,6,6- and 2,4,4,5-tetraalkylcyclohex-2-en-1-ones ((+)- 2a – d and (?)- 5a – d ), important building blocks for flowery- and woody-like odorants, have been prepared. Compounds (+)- 2a – d and (?)- 5a – d were obtained by ozonolysis of the corresponding cyclopentenic precursors, followed by intramolecular aldol condensation. Alternatively, enones (+)- 2a – d were reduced to the corresponding allylic alcohols ad converted to enones (-)- 5a – d via acidic isomerization and oxidation. ¹³C-NMR assignments are presented.     

The Absence of ß-Carotene and the Presence of Biliverdin in the Medicinal Leech Hirudo medicinalis as Determined by TLC

JPC – Journal of Planar Chromatography – Modern TLC -     

Study of the Retention Behavior of Newly Synthesized s-Triazine Derivatives in RP TLC Systems,and the Lipophilicity of the Compounds

JPC – Journal of Planar Chromatography – Modern TLC - The chromatographic behavior of nine newly synthesized s-tri-azines has been studied by thin-layer chromatography on C18/UV254...     

Applicability of the BioArena System to Investigation of the Mechanisms of Biological Effects

JPC – Journal of Planar Chromatography – Modern TLC - Bioautography can be extended to a complex system called BioArena by linking different steps to it, for example dissolving a...     

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

JPC – Journal of Planar Chromatography – Modern TLC -     

Thin-Layer Chromatographic Determination of the pKa Values of Organic Acids and Bases

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.

Determination of the Yields of meso-Tetraphenylporphyrins by Densitometry

JPC – Journal of Planar Chromatography – Modern TLC - Thin-layer chromatography with densitometric detection has been used to monitor different compounds produced by condensation of...     

Optimization of the TLC Separation of Seven Amino Acids

JPC – Journal of Planar Chromatography – Modern TLC - A ternary mobile phase for thin-layer chromatographic separation and identification of seven amino acids on microcrystalline...     

A New Chromogenic Spray Reagent for the Detection and Identification of Monocrotophos

JPC – Journal of Planar Chromatography – Modern TLC -     

HPTLC Procedure for Determination of Levonorgestrel in the Drug-Release Media of an In-situ-Forming Delivery System

JPC – Journal of Planar Chromatography – Modern TLC -     

Optimization of the Visualization of Steroids Separated by OPLC

JPC – Journal of Planar Chromatography – Modern TLC - The acidic visualization methods most often used for steroids have been optimized and compared. Sulfuric acid at three different...     

Partial Least-Squares Study of the Effects of Organic Modifier and Physicochemical Properties on the Retention of Some Thiazoles

JPC – Journal of Planar Chromatography – Modern TLC - Reversed-phase (RP) HPTLC with aqueous ammonia-organic modifier (acetonitrile, dioxane, acetone) mobile phases has been used to...