RESUMO
Many consumers who are aware of the importance of good nutrition demand quality food alternatives. In particular, many of them are looking for quality, plant-based protein sources such as quinoa. The objective of this work was to evaluate the techno-functional properties of gluten-free pasta from hyperprotein quinoa flour. Pasta mixes were made from gluten-free flours, corn, rice, cassava starch, hyperprotein quinoa flour and defatted high protein quinoa flour, which were subsequently extruded. The flow rheological properties of aqueous dispersions of flour mixtures were analyzed before and after the pasting test. In addition, thermal properties were analyzed by differential scanning calorimetry and structural properties by Fourier transform infrared spectroscopy. The results showed a change of flow from dilatant (n > 1) to pseudoplastic (n < 1) after the pasting test. In addition, a positive correlation was observed between hyperprotein defatted quinoa flour and viscosity, and a negative correlation with hyperprotein quinoa flour. Regarding thermal properties, it was found that all blends showed low gelatinization enthalpy values, attributed to the high proportions of HQF and HDQF. Spectroscopic analysis showed that the extrusion did not significantly affect the native structure of the protein, by monitoring the intensities of the 1648 cm-1, 1656 cm-1 and 1667 cm-1 bands associated with the Random coil, α-helix, ß-turns secondary structures, respectively. It was possible to conclude that both hyperprotein quinoa flour and defatted hyperprotein quinoa flours have a differential influence on the techno-functional properties of pasta. The first one, tends to reduce viscosity and consistency while the second one tends to increase it. Finally, moderate temperatures during extrusion did not cause significant changes in starch and protein structures as determined by spectroscopic study.
RESUMO
RESUMEN En los últimos años, la demanda de productos saludables se ha venido incrementando, con lo cual, muchas investigaciones se han focalizado hacia la producción de alimentos y bebidas con potencial nutracéutico. El objetivo de este trabajo fue desarrollar una bebida energizante, a base de panela, jugo de maracuyá, cristales de aloe vera (AV), con propiedades antioxidantes. Se evaluó el contenido de compuestos fenólicos, ácido ascórbico y la capacidad antirradicalaria de las materias primas y las bebidas producidas. Se realizó un análisis sensorial, para verificar la aceptación del sabor, color, textura del AV y la aceptabilidad global de tres bebidas, seleccionadas de acuerdo con sus propiedades antioxidantes. Los resultados mostraron que la panela tenía el mayor contenido de compuestos fenólicos (59,4 ± 0,2mg AGE/g), mientras que el jugo de maracuyá, la mayor actividad antirradicalaria (657 ± 5µg eq AA/mL). Las bebidas analizadas dentro del diseño experimental variaron su actividad antioxidante, con la variación de los factores. De las tres bebidas seleccionadas, la bebida 2 presentó la mayor capacidad antirradicalaria (419 ± 1µg eq AA/mL) y contenido de vitamina C (15,75 ± 0,03µg/mL) y, además, un importante contenido de compuestos fenólicos (7,6 ± 2mg AGE/mL). Asimismo, los resultados del panel sensorial mostraron que la bebida 2 tenía una alta aceptabilidad global y una mayor aceptación del sabor, por lo cual, se puede concluir que esta bebida, es la que presenta mayor potencial antioxidante y comercial.
ABSTRACT In recent years, the demand for healthy products has been increasing, so much research has focused on the production of foods and beverages with nutraceutical potential. The aim of this work was to develop an energy drink, based on panela, passion fruit juice and aloe vera (AV) crystals with antioxidant properties. The content of phenolic compounds, ascorbic acid and the anti-radical capacity of the raw materials and beverages produced were evaluated. A sensory analysis was performed, to verify the acceptance of taste, color, AV texture and overall acceptability of three beverages, selected according to their antioxidant properties. The results showed that panela had the highest content of phenolic compounds (59.4 ± 0.2mg AGE/g), while passion fruit juice had the highest anti-radical activity (657 ± 5µg eq AA/mL). The beverages analyzed within the experimental design varied in their antioxidant activity with varying factors. Of the three drinks selected, drink 2 had the highest anti-radical capacity (419 ± 1µg AA eq/mL) and vitamin C content (15,75 ± 0,03µg/mL) and also a significant content of phenolic compounds (7,6 ± 2mg AGE/mL). Likewise, the results of the sensory panel showed that beverage 2 had a high overall acceptability and a greater acceptance of the taste, so it can be concluded that this drink is the one with the greatest antioxidant and commercial potential.
