Taking into account the total content of caffeine in the green
tea leaves (27.0 mg/g), the recovery of caffeine (mass of caffeine
in the extract/mass of caffeine in green tea leaves × 100) at 343K,
30 MPa and 210 min of extraction were 48.3% and 52.6% using
CO2 + EL in the static and dynamic modes respectively, while recoveries
lower than 40% were obtained with the other cosolvents (see
Tables 2 and 3). This result is in agreement with previous results
reported by the authors [32] regarding the effectiveness of ethyl
lactate in comparison with ethanol or ethyl acetate in the pressurized
liquid extraction of caffeine from green coffee beans.