3. Results and discussion
Methods using chemical reagents or organic solvents to extract and isolate phenolic compounds from plant extracts are not always ecologically friendly. In this research, AC was tested to isolate CGA from green arabica coffee beans as an alternative to limit the use of polluting solvents. Three extraction methods (water at 80 °C, aqueous methanol 70% (v/v) and aqueous isopropanol 60% (v/v)) and two isolation methods (Rakotomalala (1992) and AC) were tested. Results obtained from the six extraction-isolation treatments are presented in Table 1. No significant differences (α = 0.05) were observed between results and the CGA content varied from 4.67 to 5.87% (db)