Physical, cooking and thermal properties of African rice (Oryza glaberrima) and its starch digestibility in vitro
| Autor: | Eric Bertoft, Sanaa Ragaee, John Manful, Massimo F. Marcone, El-Sayed M. Abdel-Aal, Joseph Gayin |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
030109 nutrition & dietetics Oryza sativa biology Starch food and beverages 04 agricultural and veterinary sciences biochemical phenomena metabolism and nutrition Oryza glaberrima biology.organism_classification 040401 food science carbohydrates (lipids) 03 medical and health sciences chemistry.chemical_compound 0404 agricultural biotechnology chemistry Amylose Volume expansion High amylose Botany Grain quality heterocyclic compounds lipids (amino acids peptides and proteins) Food science Food Science |
| Zdroj: | LWT. 75:481-487 |
| ISSN: | 0023-6438 |
| DOI: | 10.1016/j.lwt.2016.09.023 |
| Popis: | Rice is a staple food worldwide. In this study, seven African rice (Oryza glaberrima) accessions (ARAs) were evaluated for grain quality attributes, pasting, thermal and in vitro digestion properties in comparison with two Asian rice (Oryza sativa) varieties (ARVs) and a developed cross (O. sativa × O. glaberrima cross). The ARAs were intermediate to high amylose rice types and their 1000-kernel weight and bulk densities were comparable to the ARVs. Volume expansion ratios of cooked kernels overlapped among rice varieties ranging from 2.5 to 4.4 and the ARAs had relatively lower cooking solids loss and harder texture compared to the ARVs which were softer and more adhesive. Flours from the ARVs formed more viscous slurries, exhibiting higher breakdown viscosities than the ARAs. Gelatinization transition temperatures and enthalpies were significantly higher for flours from ARAs than the ARVs suggesting more stable crystal structure for ARAs. This is supported by the higher energy required to liquefy the retrograded ARAs flour gels. The cooked samples of ARAs and ARVs showed close starch digestibility indices with expected glycemic index (eGI) ranging from 71 to 78. Differences observed in cooking characteristics and textural properties between ARAs and ARVs may be partially due to the ARAs’ high amylose content. |
| Databáze: | OpenAIRE |
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