boutilism toxin clostridium boutilini proline nitrate reductase cured meats tsnas nypr ndma derivatives dna damage dna mode of action properties guanidines carbamates amides basepair change overcooked food n-nitrosamine carcinogenicity breads gcms storage condition french fries excessive heating of food cacl2 nacl mitigation strategies toxicology potato chips triglycerides maillard reaction reducing sugar mechanism properties of acrylamide 120 degree celcius food at high heat asparagine carcinogen acrylamide
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