Changes of physicochemical properties of potato protein emulsion cold gel induced by gluconate-delta-lactone with focus on formation mechanism
摘要
Potato protein is an ideal carrier for the delivery of hydrophobic nutrients due to its unique molecular structure and rich functional properties. In this study, a linseed oil emulsion cold gel (tPLG) based on TGase-modified potato protein was developed by the induction of gluconate-delta-lactone (GDL). Results indicated that 2.0% GDL led to the effectively improved gel strength of 114.32 g×mm with the highest WHC of 43.65%. SEM also showed that the surface of tPLG was smooth, and the network structure was uniform and tight. Strong evidence was found from the significantly increased disulfide bond (0.995 mmol/mg) at 2.0% GDL, as well as the reinforced secondary and tertiary structures of protein. Finally, tPLG induced by 2% GDL facilitated the formation of potato protein emulsion cold gel with excellent appearance, superior mechanical properties and water holding capacity. Therefore, the produced tPLG could be served as an effective way of embedding linseed oil, providing more possibilities for the high-value utilization of potato protein, and thereby alleviating the problems of environmental pollution and resource waste.