测量应用案例-20191003

Egg yolk is an indispensable ingredient in the preparation of food emulsions due to its unique nutritional value and functional properties. However, egg yolk is sensitive to heat treatment and has poor emulsifying stability, which can be a limitation to the application of egg yolk in food industry. This study, the effect of neutral and alkaline protease (2,000U/g egg yolk protein) on thermal stability and emulsifying properties of egg yolk was investigated. Results showed that the hydrolysed egg yolk had higher thermal stability and emulsifying stability, especially for the samples hydrolysed by alkaline protease. The molecular weight of hydrolysed egg yolk protein was smaller than others as proved by electrophoresis and a considerable increase of protein solubility was observed. In addition, hydrolysis changed the degree of ionization of amino acids, increasing its static charge.