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Preparation and characterization of water/oil and water/oil/water emulsions containing biopolymer-gelled water droplets

journal contribution
posted on 01.08.2012, 10:03 authored by Jeonghee Surh, Goran VladisavljevicGoran Vladisavljevic, Saehun Mun, D. Julian McClements
The purpose of this study was to create water-in-oil (W/O) and water-in-oil-in-water (W/O/W) emulsions containing gelled internal water droplets. Twenty weight percent W/O emulsions stabilized by a nonionic surfactant (6.4 wt % polyglycerol polyricinoleate, PGPR) were prepared that contained either 0 or 15 wt % whey protein isolate (WPI) in the aqueous phase, with the WPI-containing emulsions being either unheated or heated (80 °C for 20 min) to gel the protein. Optical microscopy and sedimentation tests did not indicate any significant changes in droplet characteristics of the W/O emulsions depending on WPI content (0 or 15%), shearing (0-7 min at constant shear), thermal processing (30-90 °C for 30 min), or storage at room temperature (up to 3 weeks). W/O/W emulsions were produced by homogenizing the W/O emulsions with an aqueous Tween 20 solution using either a membrane homogenizer (MH) or a high-pressure valve homogenizer (HPVH). For the MH the mean oil droplet size decreased with increasing number of passes, whereas for the HPVH it decreased with increasing number of passes and increasing homogenization pressure. The HPVH produced smaller droplets than the MH, but the MH produced a narrower particle size distribution. All W/O/W emulsions had a high retention of water droplets (>95%) within the larger oil droplets after homogenization. This study shows that W/O/W emulsions containing oil droplets with gelled water droplets inside can be produced by using MH or HPVH.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Chemical Engineering

Citation

SURH, J. ... et al, 2007. Preparation and characterization of water/oil and water/oil/water emulsions containing biopolymer-gelled water droplets. Journal of Agricultural and Food Chemistry, 55 (1), pp.175-184.

Publisher

© American Chemical Society

Version

NA (Not Applicable or Unknown)

Publication date

2007

Notes

This journal article is Closed Access. It was published in the Journal of Agricultural and Food Chemistry: http://pubs.acs.org/journal/jafcau

ISSN

0021-8561

Language

en