الفهرس 
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Abstract
This dissertation is mainly concerned with the
chromatographic behaviour of structurally related carrboxylic and ammo acids as ilrlluenced by their own chemmical structure ani various solvent systems. The massive amOunt of data obtained during the course of the present
investigation necessitated its presentation under the following sections:
A- The chromatographic behaviour of various carboxylic aCids on both paper and thin-layer plates using four binary solvent systems (water-acetone, water-methanol, methanol-acetone, and ethylene glycol-acetone) and one ternary solvent system (watar-methanol-acetone), which load to the following conclusions :
a) In paper chromatography, o.)J-2/ L)./u1 is generally the constant distribution ratio in aqueous binary solvent system which indicates that partition forces are responsible for migration of such carrboxylic acids on the chromatogram. However, when
using nOn-aqUeous binary solvent systems (methanol-aCetone and ethylene glycol-acetone) cc2/cc1 was the invariant partition ratio indicating a differrant behaviour from the aqueous solvent systems. This could lead to the conclusion that forces other than partition. probably adsorption, may be responsible for such a behaviour in non-aqueous solvent systems •
b) In thin-layer chromatography, neither cc2/cc1 ratio nor D.,u2/ D-,Ul might be expected to be constant when using aqueous solvent systams. This anomalous results of thin-layer chromatograpby in comparison with paper chromatography could be attributed to the assumption that nonpartition forces such as adsorption might come into action and sUbsequently offer an explanation for such a behaviour. However, the USe of non-aqueous methanol-acetone solvent system for the separation of amino acids
on silie gel TL plates reveled that Cc2/cc1 was dicarboxylic acids