Effects of konjac glucomannan and acetylated distarch phosphate on the gel properties of pork meat myofibrillar proteins

Abstract

The effects of konjac glucomannan (KGM) and acetylated distarch phosphate (ADSP) on properties of pork meat myofibrillar protein (MP) were investigated using rotary rheometer, colorimeter, texture analyzer, Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM) and confocal laser scanning microscope (CLSM). The addition of KGM and ADSP resulted in increase in both storage modulus (G′) and water holding capacity. Whiteness of MP gels was not influenced by the addition of KGM or ADSP, but the texture of MP gels changed apparently with the incorporation of KGM or ADSP. The temperature sweep showed that the increase in G′ was associated with the gelatinization of ADSP and its synergistic effect with KGM. The FTIR indicated that the addition of KGM and ADSP enhanced the hydrogen bond in the gel system. The addition of KGM and ADSP changed the microstructures of MP gels, indicating the possible interactions among KGM, ADSP and MP. The images of CLSM showed that starch granules filled in the gap in the protein network, meanwhile the KGM evenly dispersed in the protein network structure.