Effects of hydrocolloids on the structure and physicochemical properties of triticale starch during fermentation

Abstract

The regulation of the structure and properties of new starch varieties has been a necessary step in the development of promising products. This study investigated the effects of 1 % xanthan gum (XG) and hydroxypropyl methylcellulose (HPMC) on the physicochemical properties and structure of triticale starch during fermentation. Frequency scanning and rapid viscosity analyzer results showed that the addition of XG or HPMC during fermentation resulted in the reduced loss factor (tanθ) and the increased peak viscosity, indicating that the network gel strength is enhanced. X-ray diffraction and attenuated total reflectance Fourier transform infrared spectroscopy experimental results revealed that adding XG or HPMC in the triticale starch during fermentation increased relative crystallinity (2.7 % and 5.27 %, respectively) and short-range order. Combined with microstructure and thermal analysis, the encapsulation effect of XG or HPMC on triticale starch increased the thermal stability of triticale starch during fermentation, which was specifically reflected by higher residue content (26.69 % and 19.13 %, respectively). This study can provide a theoretical basis for the effect of hydrocolloids on the texture and digestibility of triticale starch fermented products.

Keywords: Fermentation; Hydrocolloids; Triticale starch.