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