Optimization of Decaffeination Conditions from Coffee Pulp “(Coffea Robusta) ” using Response Surface Methodology

Abstract

The study focused on determining the optimal extraction conditions of caffeine from the coffee pulp (“Coffea robusta”) using the hot water extraction method and response surface methodology (RSM). The extraction process consisted of three independent factors, namely, solvent/material ratio (30/1-50/1), extraction temperature (70-90oC), and extraction time (90-150 min) and they strongly influenced the caffeine extraction efficiency (CEE, %). The results of the research indicated that the optimum extraction conditions were a solvent/material ratio of 38.47/1, extraction temperature of 82.19oC, and extraction time of 120.55 minutes, CEE value obtained 88.52%. The predicted values of CEE were in agreement with the experimental values, thus this indicated the suitability of RSM in optimizing the extraction conditions.