“…Methods have been reported for determination of CF [9,10] or conjugated residues of CF [3] in milk. Electroanalytical techniques have been used to determine other cephalosporins, such as cefpodoxime proxetil [11], ceftazidime [12], cephalothin [13], cefminox [14], cefetamet-Na [15], cephalexin [16], cefaclor [17], ceftriaxone [18], cefixime [19], and cefepime [20], providing sensitivity equivalent to that of HPLC techniques. Most cephalosporins are electroactive by virtue of reduction of the (D 3 ) double bond of the cephem nucleus and possibly because of the presence of reducible substituents at the C 7 or C 3 positions in the molecule.…”