Microencapsulation of avocado oil by spray drying using whey protein and maltodextrin

Cold pressed avocado oil was microencapsulated by spray drying in four different wall systems consisting of whey protein isolate (WPI) alone or in combination with maltodextrin (MD) DE 5 at various ratios (90 : 10, 50 : 50 and 10 : 90). The WPI only or WPI/MD (90 : 10) powders were spherical and smo...

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Bibliographic Details
Published in:Journal of microencapsulation 2008-12, Vol.25 (8), p.549-560
Main Authors: Bae, E. K., Lee, S. J.
Format: Article
Language:English
Subjects:
avocado oil
Biological and medical sciences
Desiccation
Drug Compounding - methods
Food Preservation - methods
General pharmacology
maltodextrin
Medical sciences
Microencapsulation
Milk Proteins
oxidative stability
Persea
Persea americana
Pharmaceutical technology. Pharmaceutical industry
Pharmacology. Drug treatments
Plant Oils
Polysaccharides
spray drying
Temperature
Wettability
whey protein
Whey Proteins
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Summary:Cold pressed avocado oil was microencapsulated by spray drying in four different wall systems consisting of whey protein isolate (WPI) alone or in combination with maltodextrin (MD) DE 5 at various ratios (90 : 10, 50 : 50 and 10 : 90). The WPI only or WPI/MD (90 : 10) powders were spherical and smooth, whereas the WPI/MD (50 : 50 and 10 : 90) powders exhibited pronounced surface collapse. Increasing the MD ratio resulted in higher bulk density and wettability, probably due to more compact physical structure and hydrophilic wall matrix. Surface free oil contents and microencapsulation efficiencies of powders were 11-16% and 45-66%, respectively, and no significant differences were observed between the samples. The crude avocado oil used in this study appeared to be stable against oxidation at cold and ambient temperatures, irrespective of microencapsulation. However, at high temperature of 60°C, the oxidative stability decreased significantly in all cases but it was improved to some extent by microencapsulation.
ISSN:0265-2048
1464-5246
DOI:10.1080/02652040802075682