代谢
在试验室测试舱内接触HDI的志愿者(3.6 ppb浓度,持续7.5小时)的尿液水解后检测到了相应的胺(1,6-己二胺,HDA)。生物半衰期大约为1小时。在另一项低浓度暴露的研究中(1.7至3.1 ppb,持续2小时),尿液中HDA的水平与空气中HDI的水平成正比,半衰期为2.5小时。未水解的尿液中无法检测到HDA,这表明这种代谢物以加合物的形式存在。在这两项研究中,血浆中均未检测到HDA。在使用基于HDI的油漆并佩戴带有空气过滤面罩的22名汽车漆工中,以及在制造HDI单体的生产工人中,可以在水解尿液中识别出HDA。在22名使用HDI基油漆并佩戴空气过滤面罩的汽车漆工中,有4人的水解尿液中有HDA;而7名对照组中没有人有可检测的量。
Volunteers exposed to HDI in a test chamber (3.6 ppb for 7.5 hours) had the corresponding amine (1,6-hexamethylene diamine, HDA) in hydrolyzed urine. The biological half time was about 1 hour. In a similar study with lower exposures (1.7 to 3.1 ppb for 2 hours), HDA levels in urine were proportional to HDI levels in air, and the half time was 2.5 hours. HDA could not be found in unhydrolyzed urine, which suggests that this metabolite occurs as an adduct. HDA was not detected in plasma in either of these studies. HDA could be identified in hydrolyzed urine from car painters exposed to prepolymerized HDI and production workers making HDI monomers. Of 22 car painters who used HDI-based paint and wore face masks with air filters, 4 had HDA in hydrolyzed urine; none of seven controls had detectable amounts.
来源:Hazardous Substances Data Bank (HSDB)