title: Detection and determination of the hydrazo and azo photoproducts of 4-aminobenzoic acid by high-performance liquid chromatography.
abstract: The photochemistry of 4-aminobenzoic acid has been investigated using two validated reversed-phase HPLC methods. Up to nine photoproducts have been detected, with chromatographic evidence for the formation of 4,4'-azobenzenedicarboxylic acid and 4,4'-hydrazobenzenedicarboxylic acid. The synthesis and analytical characterization of 4,4'-hydrazobenzenedicarboxylic acid is reported.
authors.affiliation: Pharmacy Department, North Staffordshire Hospital, Stoke-on-Trent, UK.
authors.forename: S A
authors.initials: SA
authors.lastname: Langford
authors.forename: J K
authors.initials: JK
authors.lastname: Sugden
authors.forename: R W
authors.initials: RW
authors.lastname: Fitzpatrick
mesh_terms: D010129:4-Aminobenzoic Acid / Q000032:analysis* / Q000138:chemical synthesis; D001565:Benzoates / Q000032:analysis / Q000138:chemical synthesis / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D006834:Hydrazines / Q000032:analysis / Q000138:chemical synthesis / Q000737:chemistry; D010782:Photolysis; D062366:para-Aminobenzoates
chemical_list: C103215:4,4'-hydrazobenzenedicarboxylic acid; D001565:Benzoates; D006834:Hydrazines; D062366:para-Aminobenzoates; D010129:4-Aminobenzoic Acid