Thesis
Antimicrobial effects of a model salsa and its components on three pathogenic bacteria
Washington State University
Master of Science (MS), Washington State University
2003
Handle:
https://hdl.handle.net/2376/137
Abstract
The antimicrobial properties of onion, garlic, chilies, citric acid, and acetic acid against E. coli O157:H7, Salmonella typhimurium, and Listeria monocytogenes were determined in a tomato base and a model salsa at 4˚C and 22˚C. Onion, garlic, and chilies did not significantly affect the inactivation of the pathogenic bacteria when compared to the tomato base at both temperatures. Citric acid (>0.5%) and acetic acid (>0.25%) did inactivate the pathogenic bacteria significantly when compared to the tomato base at both temperatures. Products incubated at refrigeration temperatures required longer holding times to achieve the same reduction of pathogen population as compared to products at room temperature. Blending of onion, garlic, and chilies into the model salsa did not significantly affect the inactivation of the three pathogens when compared to the tomato base at both temperatures. The addition of citric acid (>1.0%) and acetic acid (>0.5%) significantly affected the inactivation of the pathogens when compared to the model salsa. As the concentration of citric and acetic acids in the products was increased, the time required to reduce the pathogen population to below detection levels decreased. Citric acid and acetic acid demonstrated more effective antimicrobial properties in the complex systems. Approximately twice as much citric acid was needed to achieve comparable inactivation of pathogens when compared to acetic acid.
Metrics
6 File views/ downloads
43 Record Views
Details
- Title
- Antimicrobial effects of a model salsa and its components on three pathogenic bacteria
- Creators
- Michael Leonard Schmitt
- Contributors
- Richard H. Dougherty (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Food Science, School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; Pullman, Wash. :
- Identifiers
- 99900525118701842
- Language
- English
- Resource Type
- Thesis