title: Monitoring of N-nitrosodiethanolamine in cosmetic products by ion-pair complex liquid chromatography and identification with negative ion electrospray ionization mass spectrometry.
abstract: A high-performance liquid chromatographic (HPLC) method was developed for the determination of N-nitrosodiethanolamine (NDELA), which is a non-volatile N-nitrosoamine. In this method, sodium 1-octanesulfonate has been used as an ion complexation agent for NDELA. The resulting complex was analyzed by reversed-phase high-performance liquid chromatography (RP-HPLC) using a Eurospher-100 C18 column (250 x 4.6 mm, 5 microm), water/acetonitrile (95/5, v/v) and UV detection at 234 nm. The detector response was linear in the range 0.03-10.00 microg mL(-1) and the limit of detection was 0.01 microg mL(-1). The complexation of the NDELA and sodium 1-octanesulfonate was confirmed by negative ion electrospray ionization mass spectrometry at m/z 327 [M-Na](-) and also MS/MS measurements of the resulting fragments. For real sample analyses, NDELA was measured in cosmetic products after clean up by solid-phase extraction (SPE) with C(18) cartridge for water-soluble samples and liquid-liquid extraction (LLE) by methylene chloride for less water-soluble samples. The average values for NDELA recovery by SPE and LLE were 86.9 and 51.8% and relative standard deviations (RSDs%) were 0.9 and 5.6%, respectively. The presented method is easy to use, robust and can be implemented on any reversed-phase HPLC system with UV detection.
authors.affiliation: Medicinal Plants and Drugs Research Institute, Shahid Beheshti University, Evin, Tehran, Iran. aghassempour@scientist.com
authors.forename: Alireza
authors.initials: A
authors.lastname: Ghassempour
authors.forename: Monireh
authors.initials: M
authors.lastname: Abbaci
authors.forename: Zahra
authors.initials: Z
authors.lastname: Talebpour
authors.forename: Bernhard
authors.initials: B
authors.lastname: Spengler
authors.forename: Andreas
authors.initials: A
authors.lastname: Römpp
mesh_terms: D002853:Chromatography, Liquid; D003358:Cosmetics / Q000737:chemistry*; D004052:Diethylnitrosamine / Q000031:analogs & derivatives* / Q000032:analysis; D004364:Pharmaceutical Preparations; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D003358:Cosmetics; D004364:Pharmaceutical Preparations; C014129:N-nitrosodiethanolamine; D004052:Diethylnitrosamine