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Quantification of theobromine and caffeine in saliva, plasma and urine via liquid chromatography-tandem mass spectrometry: a single analytical protocol applicable to cocoa intervention studies.
Ptolemy AS, Tzioumis E, Thomke A, Rifai S, Kellogg M. Ptolemy AS, et al. Among authors: tzioumis e. J Chromatogr B Analyt Technol Biomed Life Sci. 2010 Feb 1;878(3-4):409-16. doi: 10.1016/j.jchromb.2009.12.019. Epub 2009 Dec 21. J Chromatogr B Analyt Technol Biomed Life Sci. 2010. PMID: 20045386 Clinical Trial.