title: Determination of the volume of sweat accumulated in a sweat-patch using sodium and potassium as internal reference.
abstract: In the present work, we assessed the suitability of sodium and potassium physiologically present in sweat, as internal reference allowing to re-calculate the corresponding volume of sweat collected on a PharmChek Patch. A method using capillary electrophoresis with indirect ultra-violet detection was developed for the determination of sodium and potassium in sweat. The concentrations determined in specimens collected from 12 females and 10 males, using a home-made system composed of polypropylene copolymer bag, were 1039+/-89 mg/L and 711+/-45 mg/L for sodium, and 489+/-293 mg/L and 474+/-196 mg/L for potassium, respectively. In parallel, for seven females and eight males, the comparison of the volume of sweat collected in the same way to the re-calculated volume of sweat accumulated in a patch using sodium as internal standard, gave an average agreement of 98.4+/-15.0%. Results demonstrated the usefulness of sodium as internal standard to determine the volume of sweat accumulated in a patch, and confirm the suitability of PharmChek patch for the collection and determination of cations in sweat.
authors.affiliation: Laboratoire de Toxicologie, Centre de Recherche Public - Santé/Laboratoire National de Santé; Université du Luxembourg, Campus Limpertsberg, 162a avenue de la Faïencerie, L-1511 Luxembourg. brice.appenzeller@lns.etat.lu
authors.forename: Brice M R
authors.initials: BM
authors.lastname: Appenzeller
authors.forename: Claude
authors.initials: C
authors.lastname: Schummer
authors.forename: Sophie Boura
authors.initials: SB
authors.lastname: Rodrigues
authors.forename: Robert
authors.initials: R
authors.lastname: Wennig
mesh_terms: D019075:Electrophoresis, Capillary; D005260:Female; D006801:Humans; D008297:Male; D011188:Potassium / Q000032:analysis*; D012016:Reference Values; D012964:Sodium / Q000032:analysis*; D013542:Sweat
chemical_list: D012964:Sodium; D011188:Potassium