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[High performance liquid chromatographic determination of astromicin and cefsulodin used in combination in blood samples].

Aminoglycoside and beta-lactam antibiotics are often used in combination. This paper reports a high performance liquid chromatographic determination method for each of astromicin (ASTM) and cefsulodin (CFS) in blood samples of several species. The procedure for ASTM included purification with CM-Sephadex, separation on a reversed phase column (C-18) and derivatization with o-phthalaldehyde (OPA). The procedure for CFS included deproteinization with methanol, centrifugation, filtration and separation on a reversed phase column (C-18). Either of the drugs did not affect the determination of the other. The detection limits were 0.1 microgram/ml for ASTM and 0.5 microgram/ml for CFS. These sensitivities seem good enough for a clinical application of the method considering usual dosage levels of the drugs.