2.5.13. Caffeine and CGA
The procedure was performed according to Del Castillo, Ames,
and Gordon (2002). Separation was carried out in a capillary
electrophoresis system with an ultraviolet–visible detection.
Calibration curves of caffeine (0.25–5.15 mmol/l) and CGA
(0.15–2.5 mmol/l) were constructed. The analyses were performed
in triplicate. Results were expressed as% 3-CGA (w/w) and %
caffeine (w/w).