N,N-Dimethyl-n-octylamine is used as ion-pairing agent in the quantitative estimation of thiazinamium methylsulphate in a pharmaceutical preparation by HPLC. It acts as a counterion in mobile phase for separation of tetracycline, tetracycline analogs and their potential impurities by reversed-phase ion-pair chromatography. Further, it is used in the study of chiral separations by complexation with proteins in capillary zone electrophoresis. In addition to this, it is used as a mobile phase in direct resolution and quantitation of (R)- and (S)-disopyramide
