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Rice starch modification by thermal treatments with avocado oil: Autoclave versus microwave methods.
- Source :
-
International Journal of Biological Macromolecules . May2024:Part 1, Vol. 267, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
-
Abstract
- This study aimed to evaluate the physical and chemical alterations in rice starch modified by heat-moisture treatment (HMT) using an autoclave and a microwave, in association with avocado oil (AO), and evaluate the effects on thermal and structural properties, in vitro digestibility, and estimated glycemic index (eGI). Samples were adjusted to 30 % (w /w) moisture and 2, 4 and 8 % AO. HMT was conducted at 110 °C for 1 h in the autoclave (A0%, A2%, A4%, and A8%) and at 50 °C for 3 min in the microwave (M0%, M2%, M4%, and M8%). Both procedures did not alter the starch crystallinity pattern (type-A). Pasting viscosity, setback, relative crystallinity, and gelatinisation enthalpy decreased as the AO content increased in both HMT processes. The M8% showed reduced digestibility, decreased eGI (72.99, p < 0.05), and lower starch hydrolysis concentration (62.75 %, p < 0.05). The application of HMT with the addition of AO may be an interesting process for obtaining resistant starch since its content increased after both treatments (A8%, M4%, and M8%). The microwave process proved efficient, making it possible to use a lower temperature, less time, and less energy for modification and obtain starches with improved characteristics. • HMT reduced the viscosity and the retrogradation of the modified starches. • The inclusion complex between amylose-lipid was confirmed by peak V-type pattern. • The HMT associated with avocado oil presents reduced in vitro digestibility and eGI. • HMT conducted by microwave is quick and efficient in rice starch modification. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01418130
- Volume :
- 267
- Database :
- Academic Search Index
- Journal :
- International Journal of Biological Macromolecules
- Publication Type :
- Academic Journal
- Accession number :
- 177033471
- Full Text :
- https://doi.org/10.1016/j.ijbiomac.2024.131426