shows the kinetic behavior of caffeine extraction fromgrounded coffee beans during 80 h of extraction in the Stu-art Orbital S150 shaker apparatus, and renewing the solvent(ethanol) at different intervals of time. Taking into accountthese results, the content of caffeine in the green coffee beanswas estimated to be 9.3 mg of caffeine/g coffee beans, whichcompares reasonably with the values reported for C. arabicavariety in the literature (Ashihara and Crozier, 2001) (caffeinecontent in green beans ≈1 %mass).