Bosnian
Albanian
Arabic
Armenian
Azerbaijani
Belarusian
Bengali
Bosnian
Catalan
Czech
Danish
Deutsch
Dutch
English
Estonian
Finnish
Français
Greek
Haitian Creole
Hebrew
Hindi
Hungarian
Icelandic
Indonesian
Irish
Italian
Japanese
Korean
Latvian
Lithuanian
Macedonian
Mongolian
Norwegian
Persian
Polish
Portuguese
Romanian
Russian
Serbian
Slovak
Slovenian
Spanish
Swahili
Swedish
Turkish
Ukrainian
Vietnamese
Български
中文(简体)
中文(繁體)
Toxicology and Industrial Health

Toluene diisocyanate: an assessment of carcinogenic risk following oral and inhalation exposure.

Samo registrirani korisnici mogu prevoditi članke
Prijavite se / prijavite se
Veza se sprema u međuspremnik
J E Doe
H D Hoffmann

Ključne riječi

Sažetak

Although respiratory sensitization and pulmonary irritation have been the subject of particular studies with toluene diisocyanate (TDI), in recent years the potential carcinogenicity of TDI has been a reason for concern and speculation. This has arisen from the expectation that following exposure to TDI the chemical would hydrolyze at aqueous tissue surfaces to give rise to toluene diamine (TDA), a mutagen and rodent carcinogen. The chemistry of TDI suggests that the reaction with biological NH2 groups such as those on proteins, and polymerization to oligoureas, will compete with the hydrolysis reaction. This has been shown with results of in vitro studies where conjugation to protein occurs without detectable formation of TDA when protein solutions in saline are exposed to TDI vapor. Lower pH levels leading to high protonation of biological NH2 groups facilitate hydrolysis of TDI to TDA and subsequent formation of polyureas. These observations are consistent with comparative toxicokinetic studies in rats, which demonstrate significant levels of TDA following oral dosing with TDI--due to the acidic environment in the stomach--but not after inhalation. These results provide an explanation for the tumors observed in rodents after oral dosing of TDI in corn oil, but not after inhalation. Inhalation is the relevant route of human exposure for TDI and the toxicokinetics of TDI exposure at occupational exposure limits have been studied. These data provide a means by which quantitative estimates of the risk of carcinogenicity possibly resulting from the intermediate formation of TDA during TDI exposure can be obtained. Several calculations have been made, all of which lead to the conclusion that TDI exposure by inhalation at the recommended occupational limits will not give rise to significant carcinogenic risk.

Pridružite se našoj
facebook stranici

Najkompletnija baza ljekovitog bilja potpomognuta naukom

  • Radi na 55 jezika
  • Biljni lijekovi potpomognuti naukom
  • Prepoznavanje biljaka po slici
  • Interaktivna GPS karta - označite bilje na lokaciji (uskoro)
  • Pročitajte naučne publikacije povezane sa vašom pretragom
  • Pretražite ljekovito bilje po učincima
  • Organizirajte svoja interesovanja i budite u toku sa istraživanjem vijesti, kliničkim ispitivanjima i patentima

Upišite simptom ili bolest i pročitajte o biljkama koje bi mogle pomoći, unesite travu i pogledajte bolesti i simptome protiv kojih se koristi.
* Sve informacije temelje se na objavljenim naučnim istraživanjima

Google Play badgeApp Store badge