The selectivity of the separation of five antihistamines has been investigated by TLC on silica gel 60 F254 and on aluminium oxide 60 F254 with a variety of mobile phases in horizontal chambers. The best separation selectivity and retention differences for the drugs on the two types of plate were obtained with the mobile phases chloroform–ethyl acetate, 1 + 1 (v/v), ethyl acetate, and butan-2-one–toluene, 7 + 3 (v/v).
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