title: Analysis of pyridoquinoline derivatives by liquid chromatography/atmospheric pressure chemical ionization mass spectrometry.
abstract: A method using liquid chromatography/atmospheric pressure chemical ionization mass spectrometry (LC/APCI-MS) has been developed for the characterization and determination of pyridoquinoline derivatives 4,6-bis(dimethylaminoethylamino)-2,8,10-trimethylpyrido[3,2-g]quinoline, 4,6-bis(dimethylaminoethoxy)-2,8,10-trimethylpyrido[3,2-g]quinoline and 4,6-bis[(dimethylaminoethyl)thio]-2,8,10-trimethylpyrido[3,2-g] quinoline, all with potential antitumor properties. LC separation was performed on a conventional C18 column using a binary mobile phase composed of acetonitrile and 50 mM aqueous ammonium formate at pH 3. The APCI mass spectra obtained showed that proton addition giving [M + H]+ was the common mode of ionization to the amino- and thiopyridoquinolines, whereas the alkoxypyridoquinoline was identified by the main formation of the [M - (C2H3)N(CH3)2 + H]+, followed by the [M + H]+ ion. The LC separation conditions and MS detection parameters were optimized for the determination. The analytical method was also applied to the determination of these pyridoquinoline derivatives in fetal calf serum using liquid-liquid extraction with dichloromethane. Acceptable recovery values were obtained, ranging between 45 and 98%.
authors.affiliation: Laboratori de Toxicologia, Facultat de Farmàcia, Universitat de València, Av. Vicent Andrés Estellés s/n, 46100 Burjassot, València, Spain. pico@uv.es
authors.forename: Y
authors.initials: Y
authors.lastname: Picó
authors.forename: G
authors.initials: G
authors.lastname: Font
authors.forename: R
authors.initials: R
authors.lastname: Balaña-Fouce
authors.forename: C
authors.initials: C
authors.lastname: Ordóñez
authors.forename: D
authors.initials: D
authors.lastname: Abbas
authors.forename: J
authors.initials: J
authors.lastname: Barbe
mesh_terms: D000097:Acetonitriles; D000818:Animals; D000970:Antineoplastic Agents / Q000032:analysis*; D002417:Cattle; D002853:Chromatography, Liquid / Q000379:methods*; D005561:Formates; D007202:Indicators and Reagents; D013058:Mass Spectrometry / Q000379:methods*; D008752:Methylene Chloride; D011804:Quinolines / Q000032:analysis* / Q000737:chemistry
chemical_list: C432484:4,6-bis((dimethylaminoethyl)thio)-2,8,10-trimethylpyrido(3,2-g)quinoline; C432485:4,6-bis(dimethylaminoethoxy)-2,8,10-trimethylpyrido(3,2-g)quinoline; C432483:4,6-bis(dimethylaminoethylamino)-2,8,10-trimethylpyrido(3,2-g)quinoline; D000097:Acetonitriles; D000970:Antineoplastic Agents; D005561:Formates; D007202:Indicators and Reagents; D011804:Quinolines; C030544:formic acid; D008752:Methylene Chloride; C032159:acetonitrile