title: SPE and HPLC/UV of resin acids in colophonium-containing products.
abstract: A new method, involving SPE and HPLC/UV diode-array detection (DAD), was developed for the quantification of colophonium components in different consumer products, such as cosmetics. Colophonium is a common cause of contact dermatitis since its components can oxidize into allergens on exposure to air. Three different resin acids were used as markers for native and oxidized colophonium, abietic acid (AbA), dehydroabietic acid (DeA), and 7-oxodehydroabietic acid (7-O-DeA). The SPE method, utilizing a mixed-mode hydrophobic and anion exchange retention mechanism, was shown to yield very clean extracts. The use of a urea-embedded C(12) HPLC stationary phase improved the separation of the resin acids compared to common C(18). Concentrations higher than 2 mg/g of both AbA and DeA were detected in wax strips. In this product also 7-O-DeA, a marker for oxidized colophonium, was detected at a level of 28 microg/g. The LODs were in the range of 7-19 microg/g and the LOQs 22-56 microg/g. The method is simple to use and can be applied on many types of technical products, not only cosmetics. For the first time, a method for technical products was developed, which separates AbA from pimaric acid.
authors.affiliation: Department of Analytical Chemistry, Stockholm University, Stockholm, Sweden. ulrika.nilsson@anchem.su.se
authors.forename: Ulrika
authors.initials: U
authors.lastname: Nilsson
authors.forename: Naghmeh
authors.initials: N
authors.lastname: Berglund
authors.forename: Fredrik
authors.initials: F
authors.lastname: Lindahl
authors.forename: Sara
authors.initials: S
authors.lastname: Axelsson
authors.forename: Theres
authors.initials: T
authors.lastname: Redeby
authors.forename: Pia
authors.initials: P
authors.lastname: Lassen
authors.forename: Ann-Therese
authors.initials: AT
authors.lastname: Karlberg
mesh_terms: D045784:Abietanes / Q000032:analysis* / Q000138:chemical synthesis; D000040:Abscisic Acid / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid / Q000295:instrumentation / Q000379:methods; D004983:Ethanolamines / Q000032:analysis*; D008968:Molecular Conformation; D012116:Resins, Plant / Q000032:analysis* / Q000737:chemistry*; D012680:Sensitivity and Specificity; D052616:Solid Phase Extraction / Q000295:instrumentation / Q000379:methods*; D013056:Spectrophotometry, Ultraviolet / Q000295:instrumentation / Q000379:methods; D013237:Stereoisomerism
chemical_list: D045784:Abietanes; D004983:Ethanolamines; D012116:Resins, Plant; D000040:Abscisic Acid; C013893:rosin; C020283:diethanolamine; C095375:7-oxodehydroabietic acid