Food and Beverage Emulsions: Microstructural and Rheological Research

A special issue of Foods (ISSN 2304-8158). This special issue belongs to the section "Food Physics and (Bio)Chemistry".

Deadline for manuscript submissions: closed (15 May 2019) | Viewed by 8225

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Guest Editor
Microstructure Engineering,School of Chemical Engineering,University of Birmingham, Birmingham B15 2TT, UK
Interests: microstructure; soft solids; emulsions; interfaces; rheology; healthy foods; clean label emulsifiers; chocolate rheology
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Guest Editor
School of Chemical Engineering, College of Engineering and Physical Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK

Special Issue Information

Dear Colleagues,

Many food and beverage products are based on emulsion technology, ranging from macro emulsions at micrometre-length scales to nano emulsions possessing sub-micron-sized droplets. In addition to these thermodynamically-unstable systems, spontaneously-formed micro emulsions exist. Emulsion technology over such varied colloidal dimensions is applied in foods and beverages to impart desired texture properties, create mouthfeel, deliver bioactives targeting specific delivery sites along the human digestive system—including taste in the oral cavity, adjust optical appearance, etc. All of these functionalities are closely linked to the microstructure of the multi-phase emulsion system, including the properties of each of the immiscible phases and of their interface(s). Emulsion microstructure is created through the interplay between carefully selected emulsion components and closely controlled process regimes. Many of the above-mentioned quality attributes of food and beverage emulsions are driven by their rheological behavior, which, in turn, is related to emulsion microstructure. The relationships are undoubtedly complex due to the multiphase nature of the challenge. As a very active field of research aiming to contribute to the development of highly nutritious foods and beverages, this Special Issue endeavors to attract high-quality manuscripts to highlight scientific foundation and advance current understanding in the area of emulsion formulation in order to facilitate and encourage future commercial advances.

Dr. Bettina Wolf
Dr. Fotis Spyropoulos
Guest Editors

Manuscript Submission Information

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2900 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Complex emulsions
  • Encapsulation
  • Interfacial design
  • Interfacial rheology
  • Rheology
  • Microstructure
  • Delivery of actives
  • Processing
  • Enhanced nutritional properties
  • Consumer

Published Papers (2 papers)

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Research

13 pages, 2265 KiB  
Article
Lipid Oxidation in Emulsions Fortified with Iron-Loaded Alginate Beads
by Alime Cengiz, Karin Schroën and Claire Berton-Carabin
Foods 2019, 8(9), 361; https://doi.org/10.3390/foods8090361 - 24 Aug 2019
Cited by 12 | Viewed by 3947
Abstract
The potential use of iron-loaded alginate beads to fortify oil-in-water (O/W) emulsions was studied. Iron-loaded alginate beads with different sizes (0.65, 0.84, 1.5 and 2 mm) were produced by ionic gelation with calcium chloride, leading to 81% encapsulation efficiency (EE) of ferrous sulfate. [...] Read more.
The potential use of iron-loaded alginate beads to fortify oil-in-water (O/W) emulsions was studied. Iron-loaded alginate beads with different sizes (0.65, 0.84, 1.5 and 2 mm) were produced by ionic gelation with calcium chloride, leading to 81% encapsulation efficiency (EE) of ferrous sulfate. These beads were added to O/W emulsions to investigate their effect on lipid oxidation. The use of iron-loaded alginate beads inhibited lipid oxidation in emulsions, compared to a control emulsion with the same concentration of free ferrous sulfate in the continuous phase, but did not totally prevent it. Results obtained with scanning electron microscopy and energy dispersive X-ray spectroscopy (EDX) analysis showed that some reactive iron was present at the surface of the beads. Oxidation of the lipid droplets was slightly higher for smaller alginate beads, suggesting that the reaction could be linked to the total bead surface. When covering iron-loaded beads with an extra layer of alginate, lipid oxidation was inhibited, which confirmed the role of reactive surface-bound iron. This study shows that the location of iron within the encapsulates plays a crucial role in the chemical stability of fortified foods and should be taken as a starting point in the design of iron-fortified food products. Full article
(This article belongs to the Special Issue Food and Beverage Emulsions: Microstructural and Rheological Research)
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15 pages, 1494 KiB  
Article
Physico-Chemical Properties of Sugar Beet Pectin-Sodium Caseinate Conjugates via Different Interaction Mechanisms
by Juyang Zhang and Bettina Wolf
Foods 2019, 8(6), 192; https://doi.org/10.3390/foods8060192 - 03 Jun 2019
Cited by 17 | Viewed by 3864
Abstract
Polysaccharides and proteins are frequently conjugated through electrostatic attraction, enzymatic cross-linking, and heat treatment (Maillard reaction) to obtain food structuring ingredients, mostly for their application as emulsifiers. The conjugate partners and their interaction type affect performance at acidic or neutral pH and during [...] Read more.
Polysaccharides and proteins are frequently conjugated through electrostatic attraction, enzymatic cross-linking, and heat treatment (Maillard reaction) to obtain food structuring ingredients, mostly for their application as emulsifiers. The conjugate partners and their interaction type affect performance at acidic or neutral pH and during thermal processing, thus requiring careful selection. Here, the aggregate properties (particle size, conjugate charge, shear viscosity) of three types of sugar beet pectin (SBP)-sodium caseinate (SC) 1:1 conjugates, at acidic and neutral pH (4.5; 7), as well as their thermal processing stability (80 °C), were investigated. The enzymatically cross-linked SBP:SC was more acid tolerant than the electrostatically interacting conjugates. Maillard cross-linked conjugates aggregated at pH 4.5, suggesting poor emulsifier performance in acidic conditions. At pH 7, the three conjugate types showed similar aggregate properties. The results are discussed in terms of structural re-arrangement. Full article
(This article belongs to the Special Issue Food and Beverage Emulsions: Microstructural and Rheological Research)
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