Caffeine by G. Spiller

By G. Spiller

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Gas Chromatography GC has seen wide use in food analysis but has not seen a large following in the determination of the nonvolatile alkaloids in foods when compared to HPLC. d. packed with 10% DC-200 on 80 to 100-mesh Gas Chrom Q. 53 mm) with splitless direct injection and FID is described. 23 Direct quantitative analysis of caffeine in beverages is carried out without any sample pretreatment and lauryl alcohol is used as an internal standard. m. 6% with coeff. 5%. 4%. Results indicate that the direct injection method gave better results than the chloroform extraction method and it was concluded that the direct injection method was suitable for quantitation of caffeine in beverages.

J. A. Jr, The quantitative determination of caffeine in beverages using capillary electrophoresis analysis, 21,389-91,1993. 42. ThermoSeparation Products Application Note UN92-4 , ThermoSeparation Products; San Jose, CA, 1992 43. , Flow injection analysis for hypoxanthine in meat with dissolved oxygen detector and enzyme reactor, Talanta, 43,2053,1996. 44. , Clincial experience with theophylline: Relationship between dosage, serum concentration and toxicity, JAMA, 235,1983,1976. ©1998 CRC Press LLC 45.

24,357,1978. 59. , 4,97,1981. 60. J. , A rapid micro method for measuring theophylline in serum by reversed phase high performance liquid chromatography, Clin. , 10,74,1977. 61. , Retention behavior of a bonded reversed phase in high performance liquid chromatographic assay of serum theophylline, J. , 135,419,1977. 62. , High performance liquid chromatographic and mass spectrometric identification of dimethylxanthine metabolites of caffeine in human plasma, Biomed. Mass. , 4,172,1977. 63. , Simultaneous determination of adenosine, inosine, hypoxanthine, xanthine and uric acid in microdialysis samples using microbore column liquid chromatography with diode array detection, Analyt.

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Caffeine by G. Spiller
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