Improvement of purification process of stevia extract by combination of microfiltration and ultrafiltration

Microfiltration and ultrafiltration are used for the purification process of stevia extract to retain steviosides remove tannins. The main objective this study was obtain operating conditions that resulted in lowest stevioside rejection highest tannin rejection. using microfiltration membrane carried out at transmembrane pressure (1.20, 1.40, 1.65, 1.80, 1.90 bar), cross flow velocity (0.04, 0.06, 0.11 m s-1), concentration feed (7.12, 10.25, 14.03, 18.47 g L-1). (0.06, 0.09, 0.12 (4.59 10.36 first step a resulting permeate as process. second an membrane. best were 14.03 L-1 bar s-1 with flux 82.90 L m-2 h-1. 26.51 h-1 s-1. processes total 59.52 % 57.99 %.