title: Analysis of penicillin N ring expansion activity from Streptomyces clavuligerus by ion-pair high-pressure liquid chromatography.
abstract: An ion-pair, reversed-phase, high-pressure liquid chromatographic method for the analysis of penicillin N ring expansion activity has been developed which allows simultaneous measurement of both substrate and product. The high-pressure liquid chromatography conditions were as follows: stationary phase, C18; flow rate, 2 ml/min; detection, 220 nm. The stationary phase was preconditioned with 4.5 mM tetrabutylammonium bromide in 0.05 M KH2PO4 (pH 4.0)-methanol (85:15, vol/vol) and then equilibrated with 0.06 mM tetrabutylammonium bromide in 0.05 M KH2PO4 (pH 4.0)-methanol (95:5, vol/vol) for analysis of reaction mixtures. These conditions separated authentic samples of penicillin N and desacetoxycephalosporin C and allowed cell-free studies of the ring expansion of penicillin N to desacetoxycephalosporin C by a partially purified enzyme from Streptomyces clavuligerus to be followed conveniently.
mesh_terms: D002511:Cephalosporins / Q000032:analysis; D055598:Chemical Phenomena; D002621:Chemistry; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D002855:Chromatography, Thin Layer; D003470:Culture Media; D010406:Penicillins / Q000378:metabolism*; D013056:Spectrophotometry, Ultraviolet; D013302:Streptomyces / Q000378:metabolism*
chemical_list: D002511:Cephalosporins; D003470:Culture Media; D010406:Penicillins; C025578:deacetoxycephalosporin C; C006414:penicillin N