Chromatogram anticircular

The Rf values for a substance measured in linear, circular and anticircular chromatograms, for which the flow conditions vary, can be related to each other by equation 7.18... 

Both circular and anticircular chromatograms require a scanning densitometer capable of radial or peripheral scanning, an option available with some instruments. Circular... 

Circular and anticircular development methods. This technique produces a radial chromatogram which requires special scanners and is generally not used for lipid separation. The principles of these development methods and the names of companies manufacturing chambers for use in such methods are reviewed by Cserhati and Forgacs (1996). 

The Revalue is the fundamental parameter in planar chromatography to describe the position of a spot on a developed chromatogram. values in linear, circular, and anticircular chromatography were defined. Correlations between these types of R were evidenced for conversion of linear R values in circular and anticircular and unidimensional multiple development. Definition of thermodynamic and relative Revalues were also reported and discussed. In addition, the importance of Rm value, which has a linear relationship with structural elements of the solute and can be used to characterize molecular hydrophobicity in reversed planar chromatography, was evidenced. 

Quantification of circular or anticircular chromatograms requires a scanner capable of radial (in the direction of sample migration) and peripheral (at right angles to the development direction) scanning. At least one commercial scanner (Camag) has this capability. 

Generally speaking, a planar chromatogram can be developed in three geometrical modes, linear, circular (radial) and anticircular, as schematically shown in Table 1. Although the circular and... 

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