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Food Biophysics

, Volume 14, Issue 4, pp 365–382 | Cite as

Improving Hydrophilic Barriers of Encapsulated Compounds in Ca-Alginate Microgel Particles through a New Ionotropic Gelation Method for Double Emulsion Droplets

  • Boon-Beng Lee
  • Bhesh R. Bhandari
  • Su Hung Ching
  • Tony HowesEmail author
ORIGINAL ARTICLE
  • 108 Downloads

Abstract

The ability of encapsulation to protect hydrophilic–bioactive food compounds from harsh environments can be improved by strengthening the hydrophilic barriers of encapsulated food compounds in Ca-alginate microgel particles via the integration of oil into the microgels. This study introduces a one-step procedure to integrate water-in-oil (W/O) emulsion droplets directly into Ca-alginate microgels during the production using the impinging aerosols system. A water-in-oil-in-water (20 kg m−3 alginate solution) (W1/O/W2) double emulsion was prepared using a high speed homogeniser followed by a microfluidiser. The microstructure of the W1/O/W2 emulsion was analysed using optical and fluorescence microscopy. The mean diameters of the W1/O/W2 emulsion droplets and resultant microgels were in the range of 27.8–65.4 μm and 160–420 μm, respectively. Food dye was used as a proxy for a hydrophilic food compound and its release from the microgels was significantly decreased when it was encapsulated in the W/O emulsion droplets. Based on the numerical analysis, the presence of the W/O emulsion droplets in the gel network reduced the degree of gelation of the microgel because the diffusion rate of Ca2+ cation in the microgel is reduced. The degree of gelation of the W/O emulsion droplets encapsulated microgel is 0.6 when the diameter of the droplet is reduced to 77.5 μm and the concentration of CaCl2 solution is doubled to 22 kg m−3. The potentiality of the impinging aerosol system to produce Ca-alginate microgels to encapsulate hydrophilic compounds with improved barriers is presented in this work.

Keywords

Ca-alginate microgel Hydrophilic barrier Double emulsion Impinging aerosol system Encapsulation 

Nomenclature

Symbols Used

A

[m2], surface area of alginate solution droplet

B

[kg m−3], concentration of alginate solution

C

[kg m−3], concentration of Ca2+ cation

d

[m], diameter

d0.1

[μm], diameter such that 10% of the total sample volume have a smaller diameter

d0.5

[μm], diameter such that 50% of the total sample volume have a smaller diameter

d0.9

[μm], diameter such that 90% of the total sample volume have a smaller diameter

d3,2

[μm], volume surface mean diameter

d4,3

[μm], volume mean diameter

D

[m2 s−1], diffusion coefficient

E

[−], collection efficiency

G

[kg m−3], concentration of Ca-alginate gel

h

[m], falling distance

i

[−], position (or grid point) in alginate solution droplet

j

[−], average number of Ca2+ cation per alginate-alginate dimer formation

k

[m6 kg−2 s−1], reaction rate constant

m

[kg], mass

N

[−], number of grid point

P

[−], degree of gelation; [kg m−3 s−1], reaction rate

R

[−], dye released ratio

r

[m], radial distance from the centre of an alginate solution droplet

u

[m s−1], velocity

V

[m3], volume

\( \dot{V} \)

[m3 s−1], volumetric flow rate

Greek Letters

θ

[m3 m−3], concentration of CaCl2 droplets

φ

[−], volume fraction

ω

[−], span

Subscripts

a

air

B

alginate

C

calcium chloride

d

alginate solution droplet

E

collected/deposited

e

effective

f

final

L

liquid

o

initial or blank

s

surface

t

total

Notes

Acknowledgements

The authors thank the Ministry of Higher Education, Malaysia and the Universiti Malaysia Perlis for providing a PhD scholarship to Mr. Lee Boon Beng.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.School of Chemical EngineeringThe University of QueenslandBrisbaneAustralia
  2. 2.Centre of Excellence for Biomass Utilization, School of Bioprocess EngineeringUniversiti Malaysia PerlisArauMalaysia
  3. 3.School of Agriculture and Food SciencesThe University of QueenslandBrisbaneAustralia

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