In general, flux increases with membrane pore size while retention generally decreases as membrane pore size increases (Girard and Fukumoto, 2000). The retention of sugar in the process of clarified pineapple juice by MF and UF was studied by de Carvalho et al. (2008). It was observed that the membrane pore size and MWCO as well as the geometry of the module influenced the sugar content in clarified juice. However, there was no study on the effect of membrane pore size and MWCO on phytochemical compounds of pineapple juice.