Lipopeptide produced from palm oil added culture medium wasused as a model for this experiment. To control the quality of foamfractionation process in all experiments, the culture medium wasdiluted with water so the concentration of crude lipopeptide wasequal to 3 g/L before performing foam fractionation. In most cases,the ratio of culture medium and water was around 1:1. Enrich-ment ratio and lipopeptide recovery were the two main criteriato evaluate foam fractionation efficiency. Lipopeptide enrichmentdescribes the degree of liquid volume reduction, whereas recoverycharacterizes the degree of product separation from the bioreactor