OBJECTIVES: Biological monitoring of occupational sensitizers, such as 1,5-naphthalene diisocyanate (NDI) and 4,4'-methylenediphenyl diisocyanate (MDI) is of high importance. In this study, 1,5-naphthalenediamine (NDA) and 4,4'-methylenedianiline (MDA) in hydrolysed urine and plasma were evaluated as biomarkers of exposure to NDI and MDI, respectively. METHODS: The air exposure to NDI and MDI was monitored for 30 exposed workers at four different plants. In parallel, urinary as well as blood plasma samples were collected. Biomarker levels were determined in hydrolysed urine and plasma by means of gas chromatography-mass spectrometry. RESULTS: Air exposure to both MDI and NDI was correlated to their corresponding urinary and plasma biomarkers. The correlation coefficients for the associations between air and biomarker levels were in the range of 0.51-0.65 and 0.53-0.96 for MDI and NDI, respectively. For NDI, but not for MDI, the significance and correlation coefficients were increased by adjusting the urinary biomarker levels for creatinine content or density. CONCLUSIONS: Biomarker and air levels of MDI and NDI were correlated, but there was a large individual variation.
OBJECTIVES: Biological monitoring of occupational sensitizers, such as 1,5-naphthalene diisocyanate (NDI) and 4,4'-methylenediphenyl diisocyanate (MDI) is of high importance. In this study, 1,5-naphthalenediamine (NDA) and 4,4'-methylenedianiline (MDA) in hydrolysed urine and plasma were evaluated as biomarkers of exposure to NDI and MDI, respectively. METHODS: The air exposure to NDI and MDI was monitored for 30 exposed workers at four different plants. In parallel, urinary as well as blood plasma samples were collected. Biomarker levels were determined in hydrolysed urine and plasma by means of gas chromatography-mass spectrometry. RESULTS: Air exposure to both MDI and NDI was correlated to their corresponding urinary and plasma biomarkers. The correlation coefficients for the associations between air and biomarker levels were in the range of 0.51-0.65 and 0.53-0.96 for MDI and NDI, respectively. For NDI, but not for MDI, the significance and correlation coefficients were increased by adjusting the urinary biomarker levels for creatinine content or density. CONCLUSIONS: Biomarker and air levels of MDI and NDI were correlated, but there was a large individual variation.
Authors: Carl Johan Sennbro; Christian H Lindh; Håkan Tinnerberg; Cecilia Gustavsson; Margareta Littorin; Hans Welinder; Bo A G Jönsson Journal: Biomarkers Date: 2003 May-Aug Impact factor: 2.658
Authors: Linda G T Gaines; Kenneth W Fent; Sheila L Flack; Jennifer M Thomasen; Louise M Ball; David B Richardson; Kai Ding; Stephen G Whittaker; Leena A Nylander-French Journal: Ann Occup Hyg Date: 2010-06-07
Authors: Angela R Lemons; Paul D Siegel; Morgen Mhike; Brandon F Law; Justin M Hettick; Toni A Bledsoe; Ajay P Nayak; Donald H Beezhold; Brett J Green Journal: J Occup Environ Hyg Date: 2014 Impact factor: 2.155
Authors: Håkan Tinnerberg; Karin Broberg; Christian H Lindh; Bo A G Jönsson Journal: Int Arch Occup Environ Health Date: 2013-04-05 Impact factor: 3.015
Authors: Sheila L Flack; Kenneth W Fent; Linda G Trelles Gaines; Jennifer M Thomasen; Steve Whittaker; Louise M Ball; Leena A Nylander-French Journal: Ann Occup Hyg Date: 2009-10-04
Authors: Bernice Scholten; Laura Kenny; Radu-Corneliu Duca; Anjoeka Pronk; Tiina Santonen; Karen S Galea; Miranda Loh; Katriina Huumonen; Anne Sleeuwenhoek; Matteo Creta; Lode Godderis; Kate Jones Journal: Ann Work Expo Health Date: 2020-07-01 Impact factor: 2.179