Abstract
The water-soluble proteins of nine flat fish species of high commercial value, belonging to the Pleuronectidae, Scophtalmidae, and Soleidae families, were analyzed by two-dimensional (2D) electrophoresis, this being carried out by nondenaturing isoelectric focusing (IEF) in the 3.5–9.5 pH range and gradient SDS-PAGE in the 12–14% range. Most of the major proteins fell in the 3.5–6.9 pH range. From these, the most specific proteins were in the acidic fraction (pI<5.2; MW<16 kDa). Species-specific 2D protein patterns were observed in all the nine species, and more than 25 proteins could be individualized. The combination of nondenaturing IEF and gradient SDS-PAGE, both in the absence of urea, allowed detailed characterization of both the isoelectric points and molecular weights of the major water-soluble proteins and proved to be a valuable tool for the differential characterization of the flat fish species studied.
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