Fig. 2From: Preparative HPLC for large scale isolation, and salting-out assisted liquid–liquid extraction based method for HPLC–DAD determination of khat (Catha edulis Forsk) alkaloidsPreparative HPLC chromatogram of the a oxalate salt (right to left: cathinone, cathine, norephedrine and oxalate ion) and b borohydride reduced product (right to left: cathine and norephedrine)Back to article page