单词	cotinine
释义	cotinine noun co·​tin·​ine ˈkō-tə-ˌnēn  -ˌnīn  : an alkaloid C10H12N2O that is the principal metabolite of nicotine Example Sentences Recent Examples on the Web The lab noted positive findings for caffeine, cotinine and Delta-9 carboxy THC. al, 15 Oct. 2021 According to the report, the amounts of caffeine and cotinine found in his system are not typically toxicologically significant. al, 15 Oct. 2021 According to the Centers for Disease Control and Prevention, cotinine is a compound formed after the chemical nicotine enters the body. al, 15 Oct. 2021 The study defined tobacco exposure as a child reporting smoking, living with a smoker or having serum cotinine levels, which measures recent exposure to nicotine, greater than 0.05 micrograms per liter. Megan Marples, CNN, 25 Feb. 2021 Young people's blood was tested for levels of serum cotinine, a metabolite of nicotine; 0.05 to 10 nanograms per milliliter identified exposure to secondhand smoke. Allen Kim, CNN, 15 Aug. 2019 For verification, participants took a saliva test that detects cotinine, an indicator of nicotine exposure. Catherine Ho, San Francisco Chronicle, 24 May 2018 See More Word History Etymology probably anagram of nicotine First Known Use 1893, in the meaning defined above Medical Definition cotinine noun co·​tin·​ine ˈkōt-ᵊn-ˌēn  -ˌīn  : an alkaloid C10H12N2O that is the principal metabolite of nicotine and is widely used as an indicator of recent exposure to nicotine
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