Abstract
In this work, the effect of alcoholic-alkaline treatment on the characteristics of waxy rice starch (WRS) and its aqueous suspensions was studied for the first time. Microscopy shows that the alcohol-alkali-treated WRS (AAT-WRS) was in the form of particles of lengths between 10 and 50 μm. Differential scanning calorimetry (DSC) and X-ray diffraction (XRD) analyses indicate that the original A-type crystallites of WRS had been completely eliminated by the alcoholic-alkaline treatment and no new crystalline structure was formed. Fourier-transform infrared (FTIR) spectroscopy confirms the absence of chemical reactions during the treatment. Thermogravimetric analysis (TGA) results indicated the decreased thermal stability of AAT-WRS, which may be attributed to the amorphous structure and possible degradation resulting from the treatment. Compared with the gelatinized starch suspension, the AAT-WRS aqueous suspension presented a weaker shear-thinning behaviour, lower steady-shear viscosity, lower storage and loss moduli, and higher loss tangent, which suggest a less-rigid gel structure. The rigidity of the gel further decreased with higher temperatures. Our results here could provide insights into the rational design of modified starch products with waxy rice starch.
| Original language | English |
|---|---|
| Pages (from-to) | 397-404 |
| Number of pages | 8 |
| Journal | International Journal of Biological Macromolecules |
| Volume | 134 |
| Early online date | 4 May 2019 |
| DOIs | |
| Publication status | Published - 1 Aug 2019 |
Funding
This research was funded by the China Postdoctoral Science Foundation (grant No. 2017M612679 ), the Sailing Scheme of Guangdong Province (grant No. 2017YT05H077 ), the Pearl River S and T Nova Program of Guangzhou (grant No. 201610010019 ), the Guangxi Key Laboratory of Polysaccharide Materials and Modification, Guangxi University for Nationalities (grant No. GXPSMM18ZD-02 ), and the Natural Science Foundation of Guangdong Province (project No. 2018A0303130048 ). F. Xie acknowledges the support from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 798225 .
| Funders | Funder number |
|---|---|
| Guangxi Key Laboratory for Polysaccharide Materials and Modification | |
| H2020 Marie Skłodowska-Curie Actions | |
| Sailing Scheme of Guangdong Province | 2017YT05H077 |
| Horizon 2020 Framework Programme | 798225 |
| China Postdoctoral Science Foundation | 2017M612679 |
| Natural Science Foundation of Guangdong Province | 2018A0303130048 |
| Guangxi University for Nationalities | GXPSMM18ZD-02 |
| EU - Horizon 2020 | |
| Pearl River S and T Nova Program of Guangzhou | 201610010019 |
Keywords
- Alcoholic-alkaline treatment
- Crystallinity
- Morphology
- Rheological properties
- Thermal stability
- Waxy rice starch
ASJC Scopus subject areas
- Structural Biology
- Biochemistry
- Molecular Biology
- Economics and Econometrics
- General Energy