Physicochemical Characteristics of Freeze Dried Egg White Protein Hydrolyzed by Neutrase
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Abstract
The effects of temperature and pH on the physicochemical attributes as solubility, foaming and emulsifying properties of egg white protein hydrolysate are important functional quantities for selecting applications in food industries. In this research, 1% (v/v) Neutrase was used to hydrolyze egg white protein under various temperatures (45, 50 and 55°C) and pHs (5, 6 and 7) over increasing hydrolysis times (30 min to 6 hours). The effects of Neutrase hydrolysis showed that degree of hydrolysis (DH) increased with increasing hydrolysis times resulting in 51% DH at the optimum temperature of 50°C, pH 7.0. Significantly differences of DH were detected in different pH levels, temperatures and hydrolysis times. The molecular distributions of protein hydrolysate in the ranges of 1–100 kDa at optimum hydrolysis condition were reported. Result showed the smaller size proteins in range of 30–100, 10–30, 5–10, 3–5, 1–3 and <1 kDa of 11.60, 9.90, 12.04, 8.54 and 8.81%, respectively. The freeze dried yield of egg white protein hydrolysate at 50°C, pH 7.0 was further investigated for solubility in pH values, 3.6, 7.6 and 9.0 with the foaming capacity and stability associated to those pH values. The emulsifying activity index of various pHs was also explained. These results indicated that the foaming of egg white hydrolysate increased as increasing solubility; however, emulsifying properties were decreased as decreasing solubility.
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References
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