SURFACE PROPERTIES OF MAIZE, FISH AND BOVINE SERUM PROTEIN HYDROLYSATES
The surface properties of commercial protein hydrolysates from fish (FPH), bovine serum (BSPH), maize by acid hydrolysis (MPHA) and maize by enzymatic hydrolysis (MPHE) were evaluated. The emulsifying activity (EA), stability (ES), and capacity (EC); foaming capacity (FC) and stability (FS); fat holding capacity (FHC); and solubility (S) were determined. Electric conductivity was used for evaluating the emulsifying properties. Average molecular weights were determined by SDS-PAGE. FC was determined by measuring the percentage increase in volume of the hydrolysates solutions upon stirring, whilst FS was determined by measuring the remaining foam volume after a given period of time. MPHA displayed the best EA (255 µS) (p < 0.05); MPHE showed the best ES (49.14 min) (p < 0.05); MPHA and MPHE exhibited the highest FHC values (6.7 mL/g); and MPHE had the highest FC (62.5%) (p < 0.05). FPH displayed the highest EC (340 g oil/g protein) (p < 0.05). Highest FS was shown by MPHA. In general, the best overall properties were displayed by the maize hydrolysates.
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