“…HPLC is widely employed for the determination of CIP and NOR either in biological fluids, edible animal products, feed and pharmaceutical formulations (Barbosa, Berges, Sanz-Nebot, 1996;Belal, Al-Majed, Al-Obaid, 1999;Budvari-Barany et al 1991;Córdoba-Borrego, Cordoba-Diaz, Cordoba-Diaz, 1999;Husain et al 1995;Kirkland, Mccombs, Kirkland, 1994;Lacroix, Curran, Sears, 1996;Morley, Erold, 1993;Samanidou, Christodoulou, Papadoyannis, 2005;Sowinski, Kays, 2004;Thoppil, Amin, 2000;Tiefenbacher et al 1994;Torniainen, Tammilehto, Ulvi, 1996;Vybiralova et al 2005).…”