b'\n_START_ARTICLE_\nNitrozamin\xc4\x83\n_START_PARAGRAPH_\nNitrozaminele alc\xc4\x83tuiesc un grup de compu\xc8\x99i organici care au formula structural\xc4\x83 general\xc4\x83 R\xe2\x82\x81N(\xe2\x80\x93R\xe2\x82\x82)\xe2\x80\x93N=O, ceea ce \xc3\xaenseamn\xc4\x83 c\xc4\x83 \xc3\xaen structura lor se \xc3\xaent\xc3\xa2lne\xc8\x99te o grup\xc4\x83 nitrozo legat\xc4\x83 direct de o grup\xc4\x83 fun\xc8\x9bional\xc4\x83 amin\xc4\x83. Majoritatea nitrozaminelor sunt carcinogene, \xc8\x99i sunt componente ale fumului de \xc8\x9bigar\xc4\x83. Un exemplu este dimetilnitrozamina, (CH\xe2\x82\x83)\xe2\x82\x82-N\xe2\x80\x93N=O\n_START_SECTION_\nPropriet\xc4\x83\xc8\x9bi fizico-chimice\n_START_PARAGRAPH_\nModalitatea \xc3\xaen care sunt substitui\xc8\x9bi radicalii R\xe2\x82\x81 \xc8\x99i R\xe2\x82\x82 face s\xc4\x83 fie diferen\xc8\x9be \xc3\xaentre nitrozamine \xc3\xaen ceea ce prive\xc8\x99te propriet\xc4\x83\xc8\x9bile fizico-chimice. La temperatura obi\xc8\x99nuit\xc4\x83, nitrozaminele se prezint\xc4\x83 sub form\xc4\x83 lichid\xc4\x83, \xc3\xaen cazul dimetilnitrozaminei sau sub form\xc4\x83 solid\xc4\x83, \xc3\xaen cazul dipropilnitrozaminei. Dialchilnitrozaminele sunt miscibile \xc3\xaen ap\xc4\x83 dar \xc8\x99i \xc3\xaen numero\xc8\x99i solven\xc8\x9bi organici (eter, alcool, cloroform, diclormetan \xc8\x99i hexan), temperatura de fierbere este cuprins\xc4\x83 \xc3\xaentre 150\xe2\x80\x93220\xc2\xb0C, av\xc3\xa2nd o culoare galben\xc4\x83 sau verzuie-g\xc4\x83lbuie. _NEWLINE_Majoritatea nitrozaminelor se descompun relativ u\xc8\x99or la UV, rezult\xc3\xa2nd amine secundare \xc8\x99i acidul nitros. Nitrozaminele, datorit\xc4\x83 structurii lor chimice, pot participa la reac\xc8\x9bii chimice cum ar fi: hidroliza, reducerea, absorb\xc8\x9bie \xc3\xaen UV la 245 \xc8\x99i 330 nm.'