Soaking and extrusion effects on physicochemical parameters, phytic acid, nutrient content and mineral bio-accessibility of whole rice grain
A combination of soaking and extrusion processes of whole rice grain was studied. The effects of temperature (35–55 °C) and time (24–48 h) of soaking treatment on phytic acid (PA), protein and ashes losses using a factorial design were evaluated. Taking into account ash, protein and PA losses, whole...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2015 |
| País: | Argentina |
| Institución: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/45664 |
| Acceso en línea: | http://hdl.handle.net/11336/45664 |
| Access Level: | acceso abierto |
| Palabra clave: | Bio-Accessibility Extrusion Phytic Acid Rough Rice Soaking Whole Grain https://purl.org/becyt/ford/2.11 https://purl.org/becyt/ford/2 |
| Sumario: | A combination of soaking and extrusion processes of whole rice grain was studied. The effects of temperature (35–55 °C) and time (24–48 h) of soaking treatment on phytic acid (PA), protein and ashes losses using a factorial design were evaluated. Taking into account ash, protein and PA losses, whole rice was soaked 24 h at 45 °C and extruded using a Brabender single screw extruder. Effects of extrusion temperature (160–190 °C) and moisture content (14–19 g/100 g) on product characteristics were evaluated using surface response methodology. Values corresponding to the different responses were: Expansion (1.64–3.28), Specific Volume (5.68–11.06 cm3/g), Water absorption (3.41–4.43 mL/g) and Solubility (45.44–66.20 g/100 g). The content of PA was reduced from 740.09 to 163.47 mg/100 g (77%) after both processes, resulting in a higher mineral bio-accessibility, and a 7.3% decrease of protein digestibility. Total soluble phenolics and trolox equivalent antioxidant capacity (TEAC) were affected according to the treatment. Both treatments were important to obtain a nutritionally improved whole grain product. |
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