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  • Simultaneous HPLC determination of caffeine, theobromine, and theophylline in food, drinks, and herbal products
    Srdjenović, Branislava ...
    A rapid and selective high-performance liquid chromatographic (HPLC) method isdeveloped for the separation and determination of caffeine, theobromine, andtheophylline. The chromatography is performed ... on a Zorbax Eclipse XDB-C8 column (4.6x150 mm i.d., 5-microm particle size) at 25 degrees C, with a mobile phase of water-THF (0.1% THF in water, pH 8)-acetonitrile (90:10, v/v).The flow rate is 0.8 mLžmin, and detection is by UV at 273 nm. This method permits the simultaneous determination of caffeine, theobromine, and theophylline in food, drinks, and herbal products with detection limits of 0.07-0.2 mg/L and recoveries of 100.20-100.42%. Correlation coefficients, for the calibration curves in the linear range of 0.2-100 mgžL, are greater than 0.9999 for all compounds. The within- and between-day precision is determined for both retention times and peak area. The data suggests that the proposed HPLC method can be used for routine quality control of food, drinks, and herbal products.
    Vir: Journal of chromatographic science. - ISSN 0021-9665 (Vol. 46, no. 2, 2008, str. 144-149)
    Vrsta gradiva - članek, sestavni del
    Leto - 2008
    Jezik - angleški
    COBISS.SI-ID - 2249585

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