<p>This study investigated the static and dynamic physical properties of protein foams and cake batters made from egg white protein and whey protein isolate. A method of rheological evaluation (vane method) initially employed in the study of soils was used to evaluate protein foam rheology. The method was shown to be a reliable method for determining large-scale rheological properties of protein foams. Egg white protein produced foams with higher yield stress at lower concentrations and shorter whip times than did whey protein isolate. Short lifetime decreases in yield stress were observed in foams of higher protein concentration of both types, which were both concentration and whip time dependent. This is considered to be the result of a restructuring of the system as opposed to collapse of the foam. Cakes made from foams of both types showed different performance properties as well. Cakes produced from egg white protein exhibited a minimum concentration of protein (between 5 and 10% w/w of foam) necessary to form a cake of satisfactory volume. Whey protein isolate was unable to form a satisfactory cake regardless of the concentration studied. Phase contrast microscopy, fluorescence microscopy and differential scanning calorimetry studies suggested that the difference in behaviors might be due to a high degree of phase separation between egg white protein and soluble starch that was not seen in whey protein containing systems. This phase separation appears to allow significant matrix development in egg white protein containing cakes that can support the volume of the final product. <P>
| Identifer | oai:union.ndltd.org:NCSU/oai:NCSU:etd-20000327-174729 |
| Date | 31 March 2000 |
| Creators | Pernell, Christopher W |
| Contributors | Dr. E.A. Foegeding, Dr. C.R. Daubert, Dr. M. Srinivasarao |
| Publisher | NCSU |
| Source Sets | North Carolina State University |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://www.lib.ncsu.edu/theses/available/etd-20000327-174729 |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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