The selectivity of the cosolvents to extract caffeine was valued
considering the concentration of caffeine in the extracts (see
Table 2).As expected,pureCO2 producedextracts withhighcontent
of caffeine (15.9% mass) demonstrating high selectivity to extract
this alkaloid, although recovery was the lowest (21.9%). Among the
cosolvents investigated, ethyl lactate produced the highest caffeine
concentrations, with values similar (14.3% mass in static mode) or
even higher (18.2% mass in dynamic mode) than pure CO2 and the
highest caffeine recoveries as mentioned previously