The impact of extrusion on the nutritional composition, dietary fiber and in vitro digestibility of gluten-free snacks based on rice, pea and carob flour blends
- 17 August 2017
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Food & Function
- Vol. 8 (10), 3654-3663
- https://doi.org/10.1039/c7fo00910k
Abstract
Consumers and the food industry are demanding healthier products. Expanded snacks with a high nutritional value were developed from different rice, pea and carob flour blends. The proximate composition, starch (total and resistant), amylose and amylopectin, dietary fiber (soluble and insoluble) contents, and the in vitro protein digestibility of different rice-legume formulations, were evaluated before and after the extrusion process. Compared with the corresponding non-extruded blends (control), the extrusion treatment did not change the total protein content, however, it reduced the soluble protein (61–86%), the fat (69–92%) and the resistant starch contents (100%). The total starch content of all studied blends increased (2–19%) after extrusion. The processing increased the in vitro protein digestibility, reaching values around 88–95% after extrusion. Total dietary fiber was reduced around 30%, and the insoluble fraction was affected to a larger extent than the soluble fraction by the extrusion process. Because of its balanced nutritional composition, high dietary fiber content, as well as low energy density, these novel gluten-free snack-like foods could be considered as functional foods and a healthier alternative to commercially available gluten-containing or gluten-free and low nutritional value snacks.Keywords
Funding Information
- Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (CPR2014-0068)
- Ministerio de Economía y Competitividad (Project RTA2012-00042-C02)
This publication has 41 references indexed in Scilit:
- The advantage of using extrusion processing for increasing dietary fibre level in gluten-free productsFood Chemistry, 2009
- Physical and nutritional impact of fortification of corn starch-based extruded snacks with common bean (Phaseolus vulgaris L.) flour: Effects of bean addition and extrusion cookingFood Chemistry, 2008
- Composition and structure of carob (Ceratonia siliqua L.) germ proteinsFood Chemistry, 2007
- Effect of Industrial Dehydration on the Soluble Carbohydrates and Dietary Fiber Fractions in LegumesJournal of Agricultural and Food Chemistry, 2006
- Nutritional quality of important food legumesFood Chemistry, 2005
- Dietary fibre content of dry and processed beansFood Chemistry, 2002
- Effects of extrusion and traditional processing methods on antinutrients and in vitro digestibility of protein and starch in faba and kidney beansFood Chemistry, 2000
- Determination of Chemical Composition of Carob (Ceratonia siliqua): Protein, Fat, Carbohydrates, and TanninsJournal of Food Composition and Analysis, 1997
- The classification and measurement of dietary carbohydratesFood Chemistry, 1996
- A rapid and sensitive method for the quantitation of microgram quantities of protein utilizing the principle of protein-dye bindingAnalytical Biochemistry, 1976