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Table I.
Solvent-extractable fat and encapsulation efficiency of canola oil powders with different oil loading (protein:carbohydrate ratio of 1:3.5 w/w; total solids of emulsions prior to drying = 30%).
| Formulation | Solvent-extractable fat (g·100 g−1 powder) |
Encapsulation efficiency (% of total fat) |
||||
|---|---|---|---|---|---|---|
| 20% oil | 40% oil | 60% oil | 20% oil | 40% oil | 60% oil | |
| WPC80-Sucrose | 1.2 | 3.6 | 15.5 | 94.2 | 91.0 | 74.2 |
| WPC80-N-Lok | 5.6 | 23.5 | 32.9 | 72.2 | 41.3 | 45.1 |
| NaCas-Sucrose | 0.4 | 2.9 | 10.9 | 97.8 | 92.7 | 81.8 |
| NaCas-N-Lok | 2.3 | 18.0 | 30.1 | 88.7 | 55.0 | 49.9 |
Emulsions were homogenised at 60 °C and 18 MPa using a Rannie Laboratory Homogeniser (Albertslund, Denmark) and dried on a single stage co-current spray dryer (Drytec Lab-Spray dryer, Tonbridge, UK) at 180 °C inlet/80 °C outlet with a twin fluid nozzle operated at 2.5 bar pressure. There were significant effects of oil loading P < 0.001, carbohydrate type P < 0.001 and protein type P < 0.05. WPC 80 is a whey protein concentrate; NaCas is a sodium caseinate; N-Lok is an emulsifying starch.