Development of Liposome Immunoassay for Salmonella spp. using Immunomagnetic Separation and Immunoliposome
2008
Shin, J.H. (Yeungnam University, Gyeongsan, Republic of Korea) | Kim, M.H. (Yeungnam University, Gyeongsan, Republic of Korea), E-mail: [email protected]
The ability to detect Salmonella spp. is essential in the prevention of foodborne illness. This study examined a Salmonella spp. detection method involving the application of immunomagnetic separation and immunoliposomes (IMS/IL) encapsulating sulforhodamine B (SRB), a fluorescent dye. A quantitative assay was conducted by measuring the fluorescence intensity of SRB that was produced front an immunomagnetic bead-Sahnonella spp.-immunoliposome complex. The results indicated detection limits of 2.7×10∨5 and 5.2×10³ CFU/ml for Salmonella enterica subsp. enterica serovar Enteritidis (S. Enteritidis) and Salmonella enterica subsp. enterica serovar Typhimurium (S. Typhimurium), respectivley. The signal/noise ratio was improved by using 4% skim milk as a wash solution rather than 2% BSA. In addition, higher fluorescence intensity was obtained by increasing the liposome size. Compared with the conventional plating method, which takes 3-4 days for the isolation and identification of Salmonella spp., the total assay time of 10 h only including 6 h of culture enrichment was necessary for the Salmonella detection by IMS/IL. These results indicate that the IMS/IL has great potential as an alternative rapid method for Salmonella detection.
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