title: NMR-monitored solid-phase extraction of phenolphthalein glucuronide on phenylboronic acid and C18 bonded phases.
abstract: Preliminary studies have been undertaken to evaluate the potential of immobilized phenylboronic acid (PBA) for the solid-phase extraction (SPE) of glucuronide metabolites from urine. These studies have demonstrated that immobilized PBA can be used to specifically extract phenolphthalein glucuronide (5 mM) from urine. Urine samples were loaded onto the PBA SPE column in glycine buffer (pH 8.5) and were eluted using methanol-1% HCl (90:10, v/v). The overall recoveries of the phenolphthalein glucuronide for this procedure were high (99%), which compared well with similar studies carried out concomitantly on C18 bonded columns (93%).
authors.affiliation: Department of Chemistry, Birkbeck College, London, UK.
authors.forename: M
authors.initials: M
authors.lastname: Tugnait
authors.forename: F Y
authors.initials: FY
authors.lastname: Ghauri
authors.forename: I D
authors.initials: ID
authors.lastname: Wilson
authors.forename: J K
authors.initials: JK
authors.lastname: Nicholson
mesh_terms: D001897:Boronic Acids / Q000737:chemistry; D005782:Gels; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D010635:Phenolphthaleins / Q000302:isolation & purification*; D058428:Silica Gel; D012822:Silicon Dioxide / Q000737:chemistry
chemical_list: D001897:Boronic Acids; D005782:Gels; D010635:Phenolphthaleins; C016651:phenolphthalein glucuronide; D058428:Silica Gel; D012822:Silicon Dioxide; C010686:benzeneboronic acid