title: Allergic contact dermatitis from allyl isothiocyanate in a Danish cohort of 259 selected patients.
abstract: Allyl isothiocyanate is present in many plants. Allergic contact dermatitis from allyl isothiocyanate is well known but infrequently reported. The aim of this study was to investigate the prevalence of contact allergy to allyl isothiocyanate in patients with suspected contact dermatitis from vegetables and food. 259 such patients were tested at the Department of Dermatology, Gentofte Hospital, Denmark, from 1994 to 2003. Only 2 patients (0.8%) had a positive reaction (+) to allyl isothiocyanate and 43 patients (16.6%) had a ?+ reaction. One of the patients with a positive reaction provided samples of margarine, salad cream, oil and mayonnaise. These were analysed with high-performance liquid chromatography, and a moderate concentration of allyl isothiocyanate (2.5 ppm) was detected in the sample of margarine. This patient was a professional sandwich maker presenting with fingertip dermatitis mimicking 'tulip fingers' or allergic contact dermatitis from garlic and onions. In conclusion, allergic contact dermatitis from allyl isothiocyanate occurs in only a limited number of cases, despite frequent exposure. The large number of ?+ reactions raises the question as to whether the recommended patch test concentration is too low.
authors.affiliation: The National Allergy Research Centre, Gentofte Hospital, University of Copenhagen, Gentofte, Denmark. annsor@gentoftehosp.kbhamt.dk
authors.forename: Anne
authors.initials: A
authors.lastname: Lerbaek
authors.forename: Suresh Chandra
authors.initials: SC
authors.lastname: Rastogi
authors.forename: Torkil
authors.initials: T
authors.lastname: Menné
mesh_terms: D000328:Adult; D015331:Cohort Studies; D003718:Denmark; D017449:Dermatitis, Allergic Contact / Q000209:etiology*; D009783:Dermatitis, Occupational / Q000209:etiology; D005260:Female; D005511:Food Handling; D005520:Food Preservatives / Q000009:adverse effects*; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D017879:Isothiocyanates / Q000009:adverse effects*; D012189:Retrospective Studies
chemical_list: D005520:Food Preservatives; D017879:Isothiocyanates; C004471:allyl isothiocyanate