Increased consumption combined with increasing risk to foodborne illnesses
makes it necessary to identify potential sources of contamination in the food chain and
apply intervention processes that prevent/minimize the risk of contamination. The
current study investigated the effect of the decontamination treatments with chlorine and
lactic acid on the survival of Salmonella on the rind and stem scar portions of inoculated
mangoes. The presence of the pathogen in the treatment water, internalization and the
effect of the treatments on the quality of the fruit were also determined.
For scar (hydrothermal), a 3.0 log reduction was obtained for control and
additional reductions of approximately 2.2 and 1.3 log cycles were obtained with lactic
acid and chlorine respectively. Data indicates reduction in pathogen population in
cooling for all the treatments except two (Control – increase of 0.3 logs, LA-LA –
increase of 0.3 logs).
A 0.5 log reduction was obtained for the control (initial - 4.4 log10 CFU/10 cm2)
and additional reductions of approximately 1.7 and 1.3 log cycles were obtained for
treatments with lactic acid and chlorine respectively during hydrothermal treatment on the rind. For cooling, lactic acid and chlorine gave an overall reduction of approximately
1.3 and 1.4 logs respectively compared to control.
Although Salmonella was not detected in the core stem tissue by direct plating
method for most of the samples, it was detected after the enrichment method. The
pathogen was detected on the rind, stem scar and the stem tissue for most of the samples
for as long as 12 days. Salmonella was detected in treatment water with and without
sanitizers after dipping mangoes. Lactic acid was found to be more effective in reducing
pathogen population compared to chlorine in all the treatment combinations; however,
the sensory aspects (color and texture) of the fruit were compromised.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/ETD-TAMU-1119 |
| Date | 15 May 2009 |
| Creators | Kakani, Grihalakshmi |
| Contributors | Castillo, Alejandro |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Thesis, text |
| Format | electronic, application/pdf, born digital |
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