Adsorption and partition TLC separation of MAK-type aromatic amines, reduction products of azo dyes

Investigation of MAK-type aromatic amines has been performed by adsorption and partition TLC. The results obtained enabled elucidation of the influenc e of modifier, type of the adsorbent, and the structure of the examined com pounds on the selectivity of the chromatographic systems developed. Adsorpt ion TLC was performed on silica gel with isopropanol-n-hexane as mobile pha se. Normal-phase partition TLC was performed on bonded amino, cyano, and di ol plates with isopropanol-n-hexane as mobile phase whereas reversed-phase partition TLC was performed on RP-2, RP-8, and RP-18 plates with methanol-w ater mixtures as mobile phases. These chromatographic systems enable the an alysis of aromatic amines which are the reduction products of azo dyes as t heir multicomponent mixtures.