Physicochemical, functional and digestibility analyses were done of dehydrated quail egg white to determine its possible practical applications. Quail egg white was dehydrated by air convection using one of two temper...Physicochemical, functional and digestibility analyses were done of dehydrated quail egg white to determine its possible practical applications. Quail egg white was dehydrated by air convection using one of two temperatures and times: M1 (65℃, 3.5 h), M2 (65℃, 5.0 h), M3 (70℃, 3.5 h) and M4 (70℃, 5.0 h). Lyophilized quail egg white was used as a standard. All four air-dried treatments had good protein levels (92.56% to 93.96%), with electrophoresis showing the predominant proteins to be lysozyme, ovalbumin and ovotransferin. Denaturation temperatures ranged from 81.16℃ to 83.85℃ and denaturation enthalpy values from 5.51 to 9.08 J/g. Treatments M1-4 had lower water-holding (0.90 - 2.95 g/g) and oil-holding (0.92 - 1.01 g/g) capacities than the lyophilized treatment (4.5 g/g, 1.95 g/g, respectively). Foaming capacity was pH-dependent in all five treatments, with the lowest values at alkaline pH and the highest (153% to 222%) at acid pH (pH 2). Foam stability was lowest at acid pH and highest at alkaline pH. Emulsifying activity in the air-dried treatments was highest at pH 8 (41% - 46%). Emulsion stability was pH-dependent and highest in M3 between pH 2 and 4 (96.16% to 95.74%, respectively). In the air-dried treatments, in vitro protein digestibility was as high as 83.02% (M3).展开更多
为拓宽蛋清在食品加工中的应用,提高其功能性质,以含盐蛋清为原料,探讨了不同碱液对蛋清起泡性、起泡稳定性、乳化性、乳化稳定性、蛋白质溶解度以及黏度的影响。结果表明:不添加碱液时,含盐蛋清的起泡性为12.2%,起泡稳定性为41.5%,乳...为拓宽蛋清在食品加工中的应用,提高其功能性质,以含盐蛋清为原料,探讨了不同碱液对蛋清起泡性、起泡稳定性、乳化性、乳化稳定性、蛋白质溶解度以及黏度的影响。结果表明:不添加碱液时,含盐蛋清的起泡性为12.2%,起泡稳定性为41.5%,乳化活性为0.388,乳化稳定性为17 min,蛋清蛋白溶解度为89.8%,蛋清黏度为214 m Pa·s。添加不同浓度的碱液后,使得蛋清的功能性质有了很大提高。含盐蛋清的起泡性可达75%,起泡稳定性可达65%,乳化活性可达1.279,乳化稳定性可达69 min,蛋清蛋白溶解度可达99%,但蛋清黏度显著下降。碱液的加入大为改善了含盐蛋清的功能性质,拓宽了咸蛋清的应用范围。展开更多
文摘Physicochemical, functional and digestibility analyses were done of dehydrated quail egg white to determine its possible practical applications. Quail egg white was dehydrated by air convection using one of two temperatures and times: M1 (65℃, 3.5 h), M2 (65℃, 5.0 h), M3 (70℃, 3.5 h) and M4 (70℃, 5.0 h). Lyophilized quail egg white was used as a standard. All four air-dried treatments had good protein levels (92.56% to 93.96%), with electrophoresis showing the predominant proteins to be lysozyme, ovalbumin and ovotransferin. Denaturation temperatures ranged from 81.16℃ to 83.85℃ and denaturation enthalpy values from 5.51 to 9.08 J/g. Treatments M1-4 had lower water-holding (0.90 - 2.95 g/g) and oil-holding (0.92 - 1.01 g/g) capacities than the lyophilized treatment (4.5 g/g, 1.95 g/g, respectively). Foaming capacity was pH-dependent in all five treatments, with the lowest values at alkaline pH and the highest (153% to 222%) at acid pH (pH 2). Foam stability was lowest at acid pH and highest at alkaline pH. Emulsifying activity in the air-dried treatments was highest at pH 8 (41% - 46%). Emulsion stability was pH-dependent and highest in M3 between pH 2 and 4 (96.16% to 95.74%, respectively). In the air-dried treatments, in vitro protein digestibility was as high as 83.02% (M3).
文摘为拓宽蛋清在食品加工中的应用,提高其功能性质,以含盐蛋清为原料,探讨了不同碱液对蛋清起泡性、起泡稳定性、乳化性、乳化稳定性、蛋白质溶解度以及黏度的影响。结果表明:不添加碱液时,含盐蛋清的起泡性为12.2%,起泡稳定性为41.5%,乳化活性为0.388,乳化稳定性为17 min,蛋清蛋白溶解度为89.8%,蛋清黏度为214 m Pa·s。添加不同浓度的碱液后,使得蛋清的功能性质有了很大提高。含盐蛋清的起泡性可达75%,起泡稳定性可达65%,乳化活性可达1.279,乳化稳定性可达69 min,蛋清蛋白溶解度可达99%,但蛋清黏度显著下降。碱液的加入大为改善了含盐蛋清的功能性质,拓宽了咸蛋清的应用范围。
