Starch Pickering Emulsions : Process and Encapsulation Stability
Författare
Summary, in English
This thesis focuses on the development and application of starch Pickering emulsions and has been carried out along three main lines of investigation where each line has its own section in the thesis. In the first section, the preparation and properties of oil-in-water emulsions stabilized by starch granules with small sizes, including quinoa, rice and amaranth, were investigated. In the second section, the process and encapsulation stabilities of the emulsions were evaluated in the context of simple oil-in-water and double water-in-oil-in-water emulsions, with or without heat treatment. In the third section, the physical and encapsulation stabilities of the emulsions during in vitro digestion were evaluated.
Quinoa starch granules showed to have higher emulsifying efficiency both in the initial state and after accelerated stability testing. Moreover, the heat induced gelatinized layer showed to not only contribute to initial general stability, but also increased the process and encapsulation stabilities of the emulsions. Modified starch granules appeared to protect the emulsions against destabilization mechanisms during processing (i.e. freezing and freeze-drying). It was possible to create powders from starch stabilized Pickering emulsions with high oil content (up to 80%). Furthermore, emulsions stabilized by starch granules showed high stability for encapsulation of bioactive compounds during in vitro digestion. The results of this work can be used for the development of lipid-based encapsulated systems, in both liquid and powder forms for the delivery of bioactive compounds in food, pharmaceutical and cosmetic applications.
Avdelning/ar
Publiceringsår
2018-02-27
Språk
Engelska
Fulltext
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Dokumenttyp
Doktorsavhandling
Förlag
Department of Food Technology, Lund University
Ämne
- Engineering and Technology
Nyckelord
- Starch granules
- Pickering emulsions
- Encapsulation
- Freeze-thaw stability
- Freeze-drying
- In vitro digestion
- In vitro intestinal lipolysis
Status
Published
Handledare
ISBN/ISSN/Övrigt
- ISBN: 978-91-7422-576-1
- ISBN: 978-91-7422-575-4
Försvarsdatum
23 mars 2018
Försvarstid
13:15
Försvarsplats
lecture hall KC:B, Kemicentrum, Naturvetarvägen 14, Lund University, Faculty of Engineering LTH, Lund
Opponent
- Karin Schroen (Professor)