Spray Drying of Oil Emulsions

The most interesting point concerning microencapsulated oils is the influence of the characteristics of the matrices on encapsulation efficiency, which is defined as the fraction (or percentage) of the encapsulated oil in the total amount of oil (sum of surface oil and encapsulated oil). The amount of surface oil is obtained by simply washing the powder with an organic solvent, such as hexane, prior to extraction. Then, the remaining amount of oil, which is the encapsulated oil, is determined by extraction from the interior of the powdery product. 

Numerous studies have been executed for the microencapsulation of seed oil (flaxseed oil, sea buckthorn seed oil, etc.), fish oil, polyunsaturated fatty acids (PU FAs) and milk fat (Partanen et al., 2008, 2005, 2002 Tuomasjukka et al., 2006 Minemoto etal., 2002a, b Ishido etal., 2002 Faldtand Bergenstahl, 1995 Millqvist-Fureby, 2003  

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