Abstract
Caffeine was extracted and preconcentrated by the simple, fast and green method of dispersive liquid–liquid microextraction (DLLME) and analysed by gas chromatography–nitrogen phosphorus detection (GC–NPD). The influence of main parameters affecting the extraction efficiency investigated and optimised. Under the optimal conditions, the method was successfully applied to determination of caffeine in different real samples including five types of tea (green, black, white, oolong teas and tea bag), two kinds of coffee (Nescafe coffee and coffee), and eight beverages (regular Coca Cola, Coca Cola zero, regular Pepsi, Pepsi max, Sprite, 7up, Red Bull and Hype).The limit of detection (LOD) and limit of quantification (LOQ) were 0.02 and 0.05μgmL−1, respectively. Linear dynamic range (LDR) was 0.05–500μgmL−1 and determination coefficient (R2) was 0.9990. The relative standard deviation (RSD) was 3.2% (n=5, C=1μgmL−1).
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