title: Quantitative determinations by ion pair extraction. 9. Extraction of penicillins with ion-pairing and adduct-forming agents.
mesh_terms: D000085:Acetates; D000588:Amines; D002725:Chloroform; D006863:Hydrogen-Ion Concentration; D007477:Ions; D008722:Methods; D010406:Penicillins / Q000302:isolation & purification*; D000644:Quaternary Ammonium Compounds; D013053:Spectrophotometry
chemical_list: D000085:Acetates; D000588:Amines; D007477:Ions; D010406:Penicillins; D000644:Quaternary Ammonium Compounds; D002725:Chloroform