title: Thespesia populnea dermatitis.
abstract: BACKGROUND
  The allergenic properties of milo wood have not been known before now.
  
  
  OBJECTIVE
  We investigated the wood and elucidated the structure of its main sensitizer.
  
  
  METHODS
  A bowl turner suffered from allergic contact dermatitis over years. Wood shavings were extracted, and the constituents were isolated, purified, and identified. The sensitizing capacity of the main compound was determined experimentally in guinea pigs.
  
  
  RESULTS
  Initially, patch tests with sawdust suspensions and the isolated main constituent were positive. During the course of the study, however, the patient developed tolerance. The main component of milo wood was identified as a new mansonone: 7-hydroxy-2,3,5,6-tetrahydro-3,6, 9-trimethylnaphtho [1,8 bc] pyran-4,8-dione. In the sensitizing experiments, it showed to be a moderate sensitizer.
  
  
  CONCLUSIONS
  Extensive and long-lasting exposure to certain sensitizers may cause the phenomenon of hardening as has been shown in the wood working industry.
authors.affiliation: Dermatology Center, Buxtehude, Germany.
authors.forename: B M
authors.initials: BM
authors.lastname: Hausen
authors.forename: T E
authors.initials: TE
authors.lastname: Knight
authors.forename: M
authors.initials: M
authors.lastname: Milbrodt
mesh_terms: D000328:Adult; D000485:Allergens / Q000009:adverse effects* / Q000737:chemistry / Q000302:isolation & purification; D000818:Animals; D017449:Dermatitis, Allergic Contact / Q000209:etiology*; D009783:Dermatitis, Occupational / Q000209:etiology*; D006168:Guinea Pigs; D006254:Hawaii; D006801:Humans; D008297:Male; D010328:Patch Tests; D014934:Wood
chemical_list: D000485:Allergens