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The microstructure and component distribution in spray-dried emulsion particles

Paper ID Volume ID Publish Year Pages File Format Full-Text
19893 43141 2016 9 PDF Available
Title
The microstructure and component distribution in spray-dried emulsion particles
Abstract

•Confocal Raman microscopy is a powerful tool for internal mapping of particles.•Phase segregation occurs even during short drying time of particles.•Particle morphology of a given formulation is governed by emulsion processing, atomization and drying rate.

Microencapsulation by spray drying of oil-in-water (o/w) emulsions provides a means to encapsulate functional lipophilic ingredients. The active ingredient is dispersed in continuous solid phase providing protection. However, the encapsulation efficiency depends on the microstructure and morphology of the dry particles influenced by several mechanisms occurring during processing such as oil droplet breakup during atomization, ingredient diffusivity, interfacial adsorption of surface active ingredients, and drying kinetics. In this work, sunflower oil (model for lipophilic compounds) was encapsulated in solid particles composed of acacia gum and maltodextrin DE12. Three powders with different initial emulsion size (e.g. about 0.1 and 1 μm) and atomized under high and low shear rate were analysed for the morphology and distribution of oil droplets and matrix constituents within the solid particle (20–100 μm). The microscopic (optical, SEM, LVSEM, confocal Raman), spectroscopic (XPS) and analytical (solvent extraction) techniques used were either qualitative or quantitative. Their combination made it possible to determine both the composition at the surface and inside the particle. The surface differs from the bulk in composition, confirming the constituent segregation during spray drying, and depended on the initial emulsion size and atomization conditions that must be controlled for an efficient encapsulation. Especially, the use of confocal Raman microscopy is promising for the study of processstructure-properties relationship.

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Keywords
Spray-dried emulsions; Particle microstructure; Confocal raman microscopy; Phase segregation
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The microstructure and component distribution in spray-dried emulsion particles
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Publisher
Database: Elsevier - ScienceDirect
Journal: Food Structure - Volume 8, April 2016, Pages 16–24
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us