Food Products - Osmotic Pressures
Reverse-omosis membrane systems can be used to remove water from water-solute mixtures. Osmotic pressures for some common food products are indicated below:
| Food | Concentration | Osmotic Pressure (103 Pa) |
|---|---|---|
| Apple juice | 15% solids | 2070 |
| Cofee extraxt | 28% solids | 3450 |
| Grape juice | 16% solids | 2070 |
| Lactic acid | 1% (w/v) | 552 |
| Lactose | 4.7% (w/v) | 380 |
| Milk | 9% solids, no fat | 690 |
| Orange juice | 11% solids | 1587 |
| Sodium chloride | 1% (w/v) | 862 |
| Whey | 6% solids | 690 |
- 1 Pa = 10-6 N/mm2 = 10-5 bar = 1.45x10-4 psi (lbf/in2)
- w/v = weight/volume
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