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24. Control of methylxanthines in the competition horse: pharmacokinetic/pharmacodynamic studies on caffeine, theobromine and theophylline for the assessment of irrelevant concentrations. Machnik M, Kaiser S, Koppe S, Kietzmann M, Schenk I, Düe M, Thevis M, Schänzer W, Toutain PL. Drug Test Anal; 2017 Sep; 9(9):1372-1384. PubMed ID: 27662634 [Abstract] [Full Text] [Related]
25. Highly sensitive and rapid determination of theophylline, theobromine and caffeine in human plasma and urine by gradient capillary high-performance liquid chromatography-frit-fast atom bombardment mass spectrometry. Hieda Y, Kashimura S, Hara K, Kageura M. J Chromatogr B Biomed Appl; 1995 May 19; 667(2):241-6. PubMed ID: 7663696 [Abstract] [Full Text] [Related]
31. Mass spectrometric identification of methylxanthines and methyluric acids, the possible metabolites of caffeine. Rao GS, Khanna KL, Cornish HH. J Pharm Sci; 1972 Nov 19; 61(11):1822-5. PubMed ID: 4652660 [No Abstract] [Full Text] [Related]
32. Caffeine demethylation monitoring using a transdermal sweat patch. Delahunty T, Schoendorfer D. J Anal Toxicol; 1998 Nov 19; 22(7):596-600. PubMed ID: 9847011 [Abstract] [Full Text] [Related]
36. [A new method for thin-layer chromatographic separation of caffeine, theobromin and theophylline]. Szász G, Szászné Zacskó M, Polánkay V. Acta Pharm Hung; 1965 Sep 19; 35(5):207-12. PubMed ID: 5850379 [No Abstract] [Full Text] [Related]
37. A study of caffeine in tea. Deutsch EA, Deutsch ME. Am J Clin Nutr; 1980 May 19; 33(5):958-9. PubMed ID: 7369165 [No Abstract] [Full Text] [Related]
39. Determination of caffeine and its metabolites by micellar electrokinetic capillary electrophoresis. Zhao Y, Lunte CE. J Chromatogr B Biomed Sci Appl; 1997 Jan 24; 688(2):265-74. PubMed ID: 9061464 [Abstract] [Full Text] [Related]