Food Products - Osmotic Pressures
Osmotic pressure in food products.
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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