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Permanent link (DOI): https://doi.org/10.7939/R3K35MK23

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Studies on antimicrobial and antioxidant properties of phosvitin hydrolysates produced by high hydrostatic pressure combined with enzymatic hydrolysis Open Access

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Other title
Subject/Keyword
Phosvitin
Phosvitin hydrolysates
high hydrostatic pressure combined with enzymatic hydrolysis(HHP-EH)
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Yoo, Hee Joo
Supervisor and department
Sunwoo, Hoon (Pharmaceutical Science)/ Loebenberg, Raimar (Pharmaceutical Science)
Examining committee member and department
Wu, Jianping (Agricultural)
Siraki, Arno (Pharmaceutical Science)
Department
Faculty of Pharmacy and Pharmaceutical Sciences
Specialization
Pharmaceutical Sciences
Date accepted
2016-07-12T10:04:27Z
Graduation date
2016-06:Fall 2016
Degree
Master of Science
Degree level
Master's
Abstract
Phosvitin (PV) is a metal binding protein in egg yolk with unique amino acid composition (more than 55% serine). Due to a high proportion of phosphorylated serine residues, PV shows metal chelating, antioxidant and antimicrobial activities. The use of PV, however, in nutra- or pharmaceutical application has been restricted mainly due to the formation of insoluble complexes with divalent metal ions in the gastrointestinal tract. The PV hydrolysates (PVH) that are hydrolyzed by proteases may solve the problem and increase their applications without compromising the PV’s functional properties. There are many attempts to produce the PVH. However, the yield of the PVH is low due to the PV’s negative charges causing the resistance to digestive enzymes. The present technology of the high hydrostatic pressure combined with enzymatic hydrolysis (HHP-EH) is a new method to increase the enzyme efficiency. The present study of the HHP-EH shows a higher degree of hydrolysis containing more peptides with Mw< 3 kDa compared to atmospheric pressure (AP). PV Hydrolysis with Alcalase (Alc) under HHP resulted in the highest degree of hydrolysis (31.3%). The PVH treated by Alc and Trypsin (Try) obtained from both HHP and AP treatments showed superior iron chelation capacity (69-73%). Alc-PVH produced by HHP-EH displayed significantly greater reducing power (3.5 μM Trolox equivalent/mg) than AP-PVH (1.3 μM Trolox equivalent/mg). In the second study, a combination of specific IgY (100 μg/mL) and PVH-Alc-HHP (1 mg/mL) as an anti-microbial agent was found to be the most efficient to control the foodborne Enterotoxigenic Escherichia coli (ETEC) K88 and K99 in vitro. The synergistic anti-microbial activities of IgY and PVH may support their potential application in feed supplementation to prevent microbial contamination and infectious diseases. In the third study, there is limited information available on the quantification of PV. The double antibody sandwich ELISA (DAS-ELISA) and biotinylated DAS-ELISA developed has a PV detection range of 5.6 – 90 µg/mL and 2.5 – 40 ng/mL, respectively. The biotinylated DAS-ELISA is a superior method for PV quantification regarding accuracy and sensitivity. This highly efficient PV detection method may recuperate the performance of the existing protein assay methods as well as facilitate future research on PV bioactivities and applications.
Language
English
DOI
doi:10.7939/R3K35MK23
Rights
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
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Last modified: 2016:11:16 14:38:45-07:00
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