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Permanent link (DOI): https://doi.org/10.7939/R3F709

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Extraction of spent hen proteins for adhesive application Open Access

Descriptions

Other title
Subject/Keyword
Adhesives
pH-shifting extraction
Spent hen proteins
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Wang, He Nan
Supervisor and department
Wu, Jianping (Agricultural, Food, and Nutritional Science)
Betti, Mirko (Agricultural, Food, and Nutritional Science)
Examining committee member and department
Betti, Mirko (Agricultural, Food, and Nutritional Science)
Wu, Jianping (Agricultural, Food, and Nutritional Science)
Chen, Lingyun (Agricultural, Food, and Nutritional Science)
Department
Department of Agricultural, Food, and Nutritional Science
Specialization
Food Science and Technology
Date accepted
2013-03-11T13:13:40Z
Graduation date
2013-06
Degree
Master of Science
Degree level
Master's
Abstract
Spent hen is a long existing issue of the poultry industry. The purpose of this study was to find alternative uses of spent hen proteins. Spent hen proteins were first extracted by pH-shifting process; the acid-aided extraction showed higher protein recovery than that of alkaline-aided extraction. Protein isolates underwent significant structural changes during freezing storage, especially for the acid-extracted proteins. Acid-extracted proteins had inferior structure stability and gelation ability than that of alkaline-extracted proteins, due to protein degradation during acid extraction and oxidation during freezing storage. Adding cryoprotectants (CP) however improved stability during storage. Adhesives prepared from acid extracted proteins without CP displayed lower viscosity, but higher adhesive strength than those of alkaline extracted proteins and proteins with CP addition during storage. Our study suggested acid-extracted proteins stored without CP addition exposed more reactive COO- groups and formed new hydrogen bonds after curing, leading to improved adhesive performance.
Language
English
DOI
doi:10.7939/R3F709
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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