Fig. 1. Schematic diagram of batch MF and RO system.
Fig. 2. GC-MS chromatogram of sulfur-containing compounds in onion juice & onion juice by reverse osmosis (I.S: internal standard)
Table 1. Specification of the membrane module used in micro filteration and reverse osmosis
Table 2. Comparison of volatile compounds of onion juice by reverse osmosis system
Table 2. Continued
Table 3. Comparision of sugar contents in onion juice andconcentrated onion juice by RO system