1-[(+/-)-Menthoxymethyl]-X-(dimethylamino)pyridinium chlorides (X=3 or 4) were synthetized and studied for microbiol. activity. The resulting salts were analyzed for purity (thin layer chromatog.), content of cationic active substance (titrn.), mp. and chem. structure (NMR). The chirality impact of the ionic liqs. on their antimicrobial activities was obsd. The racemic counterparts were much less effective than the optically active chlorides.