Mono and double-layer emulsions of chia oil produced with ultrasound mediation

•Sonication was used to produce chia oil emulsions at different energy densities.•Simple and double layer emulsions were made with whey protein concentrate and pectin.•Higher energy densities produced overprocessing in simple layer emulsions.•Ultrasound were efficient to produce emulsions for furthe...

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Bibliographic Details
Published in:Food and bioproducts processing 2018-11, Vol.112, p.108-118
Main Authors: Vélez-Erazo, Eliana Marcela, Consoli, Larissa, Hubinger, Miriam Dupas
Format: Article
Language:English
Subjects:
Amplitudes
Droplets
Electrostatic deposition
Emulsions
Energy density
Flux density
Kinetics
Microstructure
Oil-in-water emulsion
Pectin
Phase separation
Proteins
Rheological properties
Salvia columbariae
Sonication
Stability
Ultrasonic imaging
Ultrasound
Vegetable oils
Whey
Whey protein
WPC
Zeta potential
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Summary:•Sonication was used to produce chia oil emulsions at different energy densities.•Simple and double layer emulsions were made with whey protein concentrate and pectin.•Higher energy densities produced overprocessing in simple layer emulsions.•Ultrasound were efficient to produce emulsions for further spray drying. The principle of layer by layer was used to produce mono and double-layer emulsions of encapsulated chia oil, stabilized by whey protein concentrate (WPC) and by WPC and pectin respectively. Sonication time varied from 2 to 15min, power amplitudes were of 50%, 75% and 100% (60, 90 and 128W for monolayer and 63, 95 and 132W for double-layer emulsions) and the values for energy density (Ev) were later calculated. Emulsions were characterized according to kinetic stability, zeta potential, mean droplet diameter, microstructure and rheological behavior. Emulsions stable to phase separation had a droplet size smaller than 3.69μm. Higher Ev did not necessarily improve emulsion’s stability, since over-processing was observed when an Ev higher than 332MJ/m3 was applied to WPC-stabilized emulsions. The process conditions for both mono and double-layer emulsions were set using 2-min at 100% and 75% of power amplitude (Ev: 58.7MJ/m3 and 42.7MJ/m3) respectively.
ISSN:0960-3085
1744-3571
DOI:10.1016/j.fbp.2018.09.007