title: Environmental and food analysis by desorption atmospheric pressure photoionization-mass spectrometry.
abstract: Desorption atmospheric pressure photoionization-mass spectrometry (DAPPI-MS) is a versatile surface analysis technique for a wide range of analytes, especially for neutral and non-polar analytes. Here, a set of analytes typically found in environmental or food samples was analyzed by DAPPI-MS. The set included five polyaromatic hydrocarbons (PAHs), one N-PAH, one brominated flame retardant, and nine pesticides, which were studied with three different spray solvents: acetone and toluene in positive ion mode, and anisole in negative ion mode. The analytes showed [M + H](+), M(+*), and [M-H](-) ions as well as fragmentation and substitution products. Detection limits for the studied compounds ranged from 30 pg to 1 ng (from 0.14 to 5.6 pmol). To demonstrate the feasibility of the use of DAPPI-MS two authentic samples - a circuit board and orange peel - and a spiked soil sample were analyzed. Tetrabromobisphenol A, imazalil, and PAHs were observed from the three above-mentioned samples, respectively. The method is best suited for rapid screening analysis of environmental or food samples.
authors.affiliation: Laboratory of Analytical Chemistry, Department of Chemistry, P.O.Box 55, FI-00014 University of Helsinki, Finland.
authors.forename: Laura
authors.initials: L
authors.lastname: Luosujärvi
authors.forename: Sanna
authors.initials: S
authors.lastname: Kanerva
authors.forename: Ville
authors.initials: V
authors.lastname: Saarela
authors.forename: Sami
authors.initials: S
authors.lastname: Franssila
authors.forename: Risto
authors.initials: R
authors.lastname: Kostiainen
authors.forename: Tapio
authors.initials: T
authors.lastname: Kotiaho
authors.forename: Tiina J
authors.initials: TJ
authors.lastname: Kauppila
mesh_terms: D032084:Citrus sinensis / Q000737:chemistry; D055615:Electrical Equipment and Supplies; D004785:Environmental Pollutants / Q000032:analysis*; D005504:Food Analysis / Q000379:methods*; D055768:Halogenated Diphenyl Ethers / Q000032:analysis*; D010575:Pesticides / Q000032:analysis; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis*; D012680:Sensitivity and Specificity; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000379:methods*
chemical_list: D004785:Environmental Pollutants; D055768:Halogenated Diphenyl Ethers; D010575:Pesticides; D011084:Polycyclic Aromatic Hydrocarbons