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http://dx.doi.org/10.3746/jkfn.2006.35.5.594

Changes of SDS-PAGE Pattern and Allergenicity of BSA and BGG in Beef Extract Treated with Heat and High Pressure  

Han, Gi-Dong (Dept. of Food Technology and Food Service Industry, Yeungnam University)
Fan, Jiang Ping (Dept. of Food Technology and Food Service Industry, Yeungnam University)
Suzuki, Atsushi (Dept. of Applied Biological Chemistry, faculty of Agriculture, University of Niigata)
Publication Information
Journal of the Korean Society of Food Science and Nutrition / v.35, no.5, 2006 , pp. 594-599 More about this Journal
Abstract
In our previous report, we indicated that not only BSA but also BGG played an important role in the allergenicity of beef. In this study, the effect of heat or high-pressure treatments to beef extract on the SDS-PAGE patterns was examined. The antigenicity of each treated samples was also investigated by Western blots assay with the sera of BGG-positive beef allergic patients. The BGG band and its antigenicity slightly disappeared but not generally in $100^{\circ}C$ group, indicating $100^{\circ}C$ treatment is not sufficient to totally eliminate the antigenicity of beef allergens. Compared with BGG band, BSA band significantly disappeared in SDS-PAGE with $100^{\circ}C$ treatment, indicating BSA is more heat- sensitive than BGG. When the beef extract was heated at $120^{\circ}C$, not only BSA but also BGG bands was largely disappeared in both SDS-PAGE and Western blots. High pressure (HP) treatment even at 600 MPa did not affect SDS-PAGE and Western blots pattern of BSA. On the contrary, BGG treated with HP showed visible changes in SDS-PAGE. 600 MPa treatment significantly reduced the antigencity. Interestingly, these behaviors of BGG were not found in the same experiments with pure BGG treated with HP. From these results, it was speculated that some kinds of proteolytic enzymes in beef extracts were involved in the BGG molecular degradation by HP treatment. The aging experiments of beef extracts treated with HP supported this hypothesis. Further studies are needed to clarify the function and working mechanism of enzymes associated with BGG degradation in beef extracts by HP treatment.
Keywords
food allergy; BGG; allergenicity; heat; high pressure;
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