title: Multi-residue method for the determination of 57 persistent organic pollutants in human milk and colostrum using a QuEChERS-based extraction procedure.
abstract: Human breast milk represents the best choice for the nutrition of infants. However, in addition to containing beneficial nutrients and antibodies, it can also be considered the best indicator of infant exposure to contaminants. We developed a multi-residue method using a modified QuEChERS (quick, easy, cheap, effective, rugged, and safe) procedure and capillary gas chromatography-triple quadrupole mass spectrometry for the determination of 57 persistent organic pollutants, including 23 organochlorine pesticides, 18 polychlorinated biphenyl (PCB) congeners, and 16 polycyclic aromatic hydrocarbons in human milk and colostrum samples. We have used primary secondary amine in the clean-up step as it gave a more efficient separation of the analytes from fat and superior removal of the co-extracted substances compared with gel permeation chromatography. No significant matrix effect was observed for the tested pollutants, and therefore matrix-matched calibration was not necessary. The average recoveries from spiked samples were in the range of 74.8-113.0 %. The precision was satisfactory, with relative standard deviations below 16 %, while values of 0.1-0.4 μg L(-1) were established as the limit of quantification for all the target analytes (0.05 and 100 μg L(-1)). The method was successfully applied to the analysis of 18 human colostrum and 23 mature milk samples. All the samples tested were positive for at least nine different residues, with some samples containing up to 24 contaminants. Remarkably, the contaminants hexachlorobenzene, p,p'-DDE, PCB 138, PCB 180, phenanthrene, fluoranthene, and pyrene were present in 100 % of the colostrum and mature milk samples analyzed.
authors.affiliation: Toxicology Unit, Department of Clinical Sciences, University of Las Palmas de Gran Canaria, Plaza Dr. Pasteur s/n, 35016, Las Palmas de Gran Canaria, Spain, operez@dcc.ulpgc.es.
authors.forename: Octavio P
authors.initials: OP
authors.lastname: Luzardo
authors.forename: Norberto
authors.initials: N
authors.lastname: Ruiz-Suárez
authors.forename: Maira
authors.initials: M
authors.lastname: Almeida-González
authors.forename: Luis Alberto
authors.initials: LA
authors.lastname: Henríquez-Hernández
authors.forename: Manuel
authors.initials: M
authors.lastname: Zumbado
authors.forename: Luis D
authors.initials: LD
authors.lastname: Boada
mesh_terms: D000293:Adolescent; D000328:Adult; D005591:Chemical Fractionation / Q000379:methods*; D003126:Colostrum / Q000737:chemistry*; D004785:Environmental Pollutants / Q000737:chemistry* / Q000302:isolation & purification*; D005260:Female; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D008895:Milk, Human / Q000737:chemistry*; D010575:Pesticides / Q000737:chemistry / Q000302:isolation & purification; D011084:Polycyclic Aromatic Hydrocarbons / Q000737:chemistry / Q000302:isolation & purification; D055815:Young Adult
chemical_list: D004785:Environmental Pollutants; D010575:Pesticides; D011084:Polycyclic Aromatic Hydrocarbons