title: Quantitative determination of methoxsalen in human serum, suction blister fluid and epidermis by gas chromatography mass spectrometry.
abstract: A selected ion-monitoring gas chromatographic mass spectrometric method is described for the determination of methoxsalen employing trioxsalen as internal standard. Methoxsalen in the serum and skin of 5 psoriatic patients after PUVA bath therapy was determined. Quantitative gas chromatographic mass spectrometric analysis was performed in the election impact mode by monitoring the ratio of ions m/z 216/228. The methoxsalen level in human serum varied between 3-15 ng/ml, in suction blister fluid between 2-9 ng/ml and in suction blister roof (epidermis) between 6-242 ng/g during the first 30 min after the methoxsalen bath.
mesh_terms: D001768:Blister / Q000378:metabolism*; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D008730:Methoxsalen / Q000032:analysis* / Q000097:blood; D012867:Skin / Q000032:analysis*
chemical_list: D008730:Methoxsalen