Abstract
Commercial soybean products for human consumption (soybeanprotein isolate, soybean flour, textured soybean, and soybean powdered milks)are characterized for the first time by Sodium Dodecyl Sulphate PolyacrylamideGel Electrophoresis (SDS-PAGE) using the PhastSystem®, a semi-automaticelectrophoretic system. It makes SDS-PAGE very fast and gives very sharp bandsthat simplify the identification. The time from loading the gel to characterizationis less than 1 hour and the resolution is similar to that of large conventionalgels. Proteic fractions obtained from these commercial soybean products byusing a fractionation procedure described in literature are also analyzed.The electrophoretic patterns of these globulin fractions exhibited some differenceswhich were attributed to the different technological process used for thepreparation of each product investigated. Furthermore, the electrophoreticpatterns obtained for commercial soybean products enabled the differentiationbetween products derived from soybean protein isolates and those prepareddirectly from whole soybeans.
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