Physicochemical and structural characteristics of the Venn components of wheat gliadin

Abstract

The aim of this study was to analyze the physicochemical and structural characteristics of the Venn components of wheat gliadin to provide theoretical basis of gliadin for processing in dough and Chinese steamed bread. Eight Venn components, Gli-8, Gli-9, Gli-10, Gli-11, Gli-12, Gli-13, Gli-14, and Gli-15, were extracted from wheat gliadin based on their solubility. The results of physicochemical characteristics showed that the differences in the contents, TDS, electrical conductivity, particle size and zeta potential of Venn components were significant, respectively. The content of Gli-15 in gliadin was the highest, and the content of Gli-9 was the lowest. The TDS value of Gli-9 was the highest (336.0), and the TDS value of Gli-15 was the lowest (52.0). The electrical conductivity of Gli-9 was the highest, which was 7.54 times the lowest value of Gli-11. The zeta potential of Gli-9 was −25.2 mV, and the zeta potential of the Gli-15 was −7.64 mV. However, the difference in the pH values was not significant. The results of UV spectrum and FTIR analysis showed that the secondary structures of the Venn components had significant differences. The results of the XRD patterns indicated that the Venn components might not be a single substance. The results of CLSM images implied that the molecular interactions among the components were varied. Hence, the results could provide research materials and basic data for deep processing and utilization of gliadin. Keywords: Wheat gliadin, Venn components, Physicochemical properties, Structural characteristics