Separation of sterols by vapor-programmed thin-layer chromatography

Separation of Cholesterol and Demosterol by Thin-layer Chromatography.

Strategies of sunscreen separation by thin layer chromatography.

So far sunscreens separation has been achieved primarily by HPLC or TLC on RP-18 or (less frequently) unmodified silica gel as stationary phase. The conditions of chromatographic separation published so far are not suitable for many combinations of UV filters found commonly in cosmetic products. It is therefore reasonable to seek alternative conditions that would make it possible to separate th...

Separation of plasma lipids by thin-layer chromatography.

A rapid comprehensive thin-layer chromatographic separation of the major plasma lipid classes on commercial silicic acid glass fiber paper is described. For screening purposes, oxidized fractions are rapidly visualized for qualitative interpretation. Standard colorimetric procedures for each lipid class are per­ formed upon the migration areas cut from the strips. This provides quantitative mea...

Determination of carotenes by thin-layer chromatography.

The carotenoids of yellow, red and tangerine tomato fruits were separated and identified by thin-layer chromatography (TLC). β-carotene is extracted with a mixture content hexan and acetone. The various systems of adsorbents and solvents for TLC of carote and tomato carotenes were examined, and it was revealed that the most suitable TLC system for separation and identification was silica gel pl...

A Novel Method to Chromatographically Resolution Of Sulphonamides By Vapour-Programmed Thin-Layer Chromatography

Identification, especially of drugs, plays an important role in pharmaceutical analysis. Thin-layer chromatography (TLC) has been widely applied in this field, but sometimes its resolving power leaves something to be desired. Barbiturates, steroids, sulphonamides and local anaesthetics, for example, represent classes where an abundance of closely similar derivatives are available. Separations a...