In the United States aquaculture is a billion dollar industry. Aquaculture is essentially the production of aquatic organisms under controlled conditions. Although conditions are controlled to a certain degree, absolute control is not possible. This reason alone is a huge problem that can cost the industry millions of dollars a year. In catfish, geosmin and 2-methylisoborneol are two compounds are primarily responsible for imparting a musty/earthy off-flavor. Off- flavors are secondary metabolites of some blue-green algae and actinomycete bacteria. When present in fish tissue they create an undesirable taste.
Different approaches have been used in order to alleviate the problem of catfish off- flavor, however as of yet no permanent solution has been found. Ozone, a very powerful oxidizer, is currently being used in a wide range of industries from wastewater to food. Previous research has shown that ozone is effective in eliminating off-flavors in water, while current research is exploring how it can further be applied.
The purpose of this research is to determine the effects of ozone on off-flavors in catfish. Twenty grams was cut from fresh catfish fillets and spiked with 0 or 10 ppb of the off-flavor 2-Methylisoborneol. After being stored at 4°C for at least 12 hours the catfish was exposed to oxygen or ozone treatment for 0, 30 or 60 minutes. The concentrations were determined with SPME GC-MS analysis. Quality tests such as moisture, fat and color were also determined.
The study indicates that oxygen and ozone treatments did differ, indicating that ozone treatment was successful in reducing catfish off-flavor. Moisture was unaffected, however color was significantly changed, while it was unclear if ozone was the cause of changes in fat.
| Identifer | oai:union.ndltd.org:LSU/oai:etd.lsu.edu:etd-11112005-193802 |
| Date | 15 November 2005 |
| Creators | Dew, Tameka LaShon |
| Contributors | Witoon Prinyawiwatkul, Marlene E Janes, Joan M King |
| Publisher | LSU |
| Source Sets | Louisiana State University |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lsu.edu/docs/available/etd-11112005-193802/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached herein 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 LSU or its agents the non-exclusive license to archive and make accessible, under the conditions specified below and in appropriate University policies, 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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