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Assessment of dermal uptake of diphenylmethane-4,4'-diisocyanate using tape stripping and biological monitoring.

Journal article
Authors Haneen Hamada
Ingrid Liljelind
Magnus Bruze
Malin Engfeldt
Marléne Isaksson
Bo Jönsson
Håkan Tinnerberg
Christian Lindh
Sara Axelsson
Erik Zimerson
Published in European journal of dermatology : EJD
Volume 28
Issue 2
Pages 143-148
ISSN 1952-4013
Publication year 2018
Published at
Pages 143-148
Language en
Links dx.doi.org/10.1684/ejd.2018.3247
www.ncbi.nlm.nih.gov/entrez/query.f...
Keywords Administration, Cutaneous, Adult, Arm, Female, Humans, Isocyanates, administration & dosage, blood, pharmacokinetics, urine, Male, Middle Aged, Skin Absorption, Surgical Tape, Young Adult
Subject categories Environmental Health and Occupational Health

Abstract

Very little is known about the dermal uptake of isocyanates, and dermal exposure to isocyanates has been discussed as a factor involved in the induction of respiratory diseases. To investigate the dermal uptake of diphenylmethane-4,4'-diisocyanate (4,4'-MDI). Four volunteers were dermally exposed to 10, 25, 49 and 50 mg 4,4'-MDI, respectively, for eight hours. The exposed areas were tape stripped. Urine and blood were biologically monitored for 48 hours. Tape strips, plasma, and urine were analysed by liquid chromatography-mass spectrometry. In total, 35-70% of the applied dose of 4,4'-MDI was absorbed by the skin. Very low fractions of applied dose were found in the tape strips. The 4,4'-MDA concentration in plasma and urine was low, but peaked in urine at 10-14 hours and plasma at 8-32 hours after exposure. 4,4'-MDI is readily absorbed by human skin. Only small fractions of 4,4'-MDI remain as such in the superficial skin layers. The amounts found in blood and urine were only small fractions of the total applied doses which indicates that very small amounts of 4,4'-MDI penetrate the skin and reach the blood stream. The dermal uptake and distribution of 4,4'-MDI is much slower compared to that associated with airway uptake. Our data strongly indicate that formation of 4,4'-MDA from 4,4'-MDI upon reacting with water in the skin can only occur to a very limited extent.

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