Structural and physicochemical properties of ginger (Rhizoma curcumae longae) starch and resistant starch: A
Xin Li1, Wei Chen1, Qing Chang2
1College of Food Science, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China; Fujian Provincial Key Laboratory of Quality Science and Processing Technology in Special Starch, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
Abstract:
The objectives of this study were to investigate and compare the structural and physicochemical properties of native ginger starch (NGS) and ginger resistant starch (GRS). NGS had oblate and compact granules, whereas GRS exhibited fissures. Compared to GRS, NGS had a narrower molar mass distribution and a higher molecular weight (Mw). According to X-ray diffraction measurements, Fourier transform infrared spectroscopy, and 13C CP/MAS NMR spectroscopy, NGS sample had an A-type crystalline pattern with high relative crystallinity and short-range order structure, and GRS had a B-type crystalline pattern. Furthermore, NGS exhibited significantly higher gelatinization enthalpy than GRS. NGS displayed lower peak viscosity and final viscosity, whereas GRS had higher through viscosity and final viscosity, presumably due to the content and type of resistant starch. The pasting and gelatinization properties of NGS and GRS might be related to relative crystallinity and short-range order structure. The information obtained from this study can be used by manufacturers and researchers in the production of ginger-containing products.
