High hydrostatic pressure processing of beef patties: Effects of pressure level and sodium tripolyphosphate and sodium chloride concentrations on thermal and aggregative properties of proteins
Speroni, F. | Szerman, N. | Vaudagna, S.R.
Beef patties added with sodium tripolyphosphate (STPP; 0, 0.25 or 0.5%) and/or NaCl (0, 1 or 2%) were treated at 200 or 300MPa (5min, 5°C) or kept refrigerated (non-pressurized). In non-pressurized patties, NaCl-solubilized proteins were denatured, whereas STPP-solubilized proteins remained in native state. At 200MPa, myosin head was more sensitive to high hydrostatic pressure (HHP) than actin. 1% NaCl favored HHP-induced denaturation of myosin head and actin, whereas 0.25% STPP protected against that effect. At 300MPa, STPP favored HHP-induced denaturation of myosin head, actin and other proteins. The effect of STPP at 200MPa may depend on the presence of specific binding sites for STPP anion, which would be destroyed at 300MPa. Insoluble aggregates were formed at 300MPa in samples without salts. Salts minimized protein aggregation was observed at 300MPa. Noticeable differences in thermal and aggregative behavior occurred whether HHP level was 200 or 300MPa.Currently, the reduction of sodium content in the manufacture of meat products is a hot topic and it is expected that this issue will become more relevant in the next years, as response to consumers' demands. Soluble high hydrostatic pressure-denatured beef proteins may provide interesting texture and technological properties to meat products with reduced salt content.
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