Quinoa has higher protein content (11-16% m/m) and better amino acid profile than cereals and represents a valuable resource for healthy nutrition. The aim of this work was to study the saponins extraction kinetics during washing of soaked quinoa. The experimental curves of saponins content as a function of time was measured at water temperatures of 20, 40, 60, and 70ºC. A spectrophotometric method was proposed to determine total saponins content, while an unsteady state diffusional model was applied to this extraction problem, assuming strict internal control to the mass transfer rate. As a first analysis, the complete analytical solution for constant diffusion coefficient (Deff) using the initial radius (R0) provided an accurate predicted curve at each temperature. The diffusion coefficients (around 10−10 m2s-1), were correlated with temperature using an Arrhenius-type relationship to obtain an activation energy Ea of 16.9 kJ mol-1. The preliminary values of Ea and preexponential factor (D0) thus obtained were used as initial values of a second, more robust fitting where the whole dataset of saponins concentrations as a function of time for all temperatures. The Arrhenius equation was directly inserted into the diffusional solution. The following parameters were obtained: Ea= 17.2 kJ mol-1 and, D0= 3.232×107 m2 s-1, respectively with an overall r2=0.985. Saponins content agreed well with experimental values. As the equation is capable of predicting saponin extraction times for various operating conditions, it can be used within equipment design schemes.
Abdelkader Z. Effect of blanching on the diffusion of glucose from potatoes. Nahrung-Food. 1992. p. 15–20.
2.
Brožková I, Zapletal T, Kroutilová L, Hájek T, Mo Ťková P, Červenka L. The effect of soaking regime and moderate drying temperature on the quality of buckwheat-based product. Journal of Cereal Science. 2018. p. 15–21.
3.
Chauhan G, Eskin N, Tkachuk R. Nutrients and antinutrients in quinoa seed. Cereal Chemistry. 1992. p. 85–8.
4.
Cheok C, Salman H, Sulaiman R. Extraction and quantification of saponins: a review. Food Research Interna-tional. 2014. p. 16–40.
5.
Chi R, Tian J, Gao H, Zhou F, Liu M, Wang C, et al. Kinetics of leaching flavonoids from pueraria lobata with ethanol. Chinese Journal of Chemical Engineering. 2006. p. 60091–8.
6.
Alimentarius C. Norma en estudio No CL. 2017.
7.
Crank J. The mathematics of diffusion. Oxford University Press; 1975.
8.
Erramouspe P, Armada M, Molina S. Propiedades físicoquímicas, estructurales y de calidad en semillas de quinua (chenopodium quinoa) variedad cica, con evaluación de la eficiencia de un proceso artesanal de escarificación en seco. Revista Ciencia y Tecnología de los Cultivos Industriales. 2013. p. 67–74.
9.
aq287e/aq287e.pdf Food and Agriculture Organization. International IJFS October. Food and Agriculture Organization; 2011. p. 76–88.
10.
Extraction Kinetics of saponins 87 Year of Quinoa Secretariat.
11.
Francis G, Kerem Z, Makkar H, Becker K. The biological action of saponins in animal systems: a review. British Journal of Nutrition. 2002. p. 587–605.
12.
Gianna V, Manuel Montes J, Luis Calandri E, Alberto Guzman C. Impact of several variables on the microwave extraction of chenopodium quinoa willd saponins. International Journal of Food Science and Technology. 2012. p. 1593–7.
13.
Hostettmann K, Marston A. Chemistry and pharmacology of natural products: saponins. Cambridge University Press; 1995.
14.
Jan K, Panesar P, Rana J, Singh S. Structural, thermal and rheological properties of starches isolated from indian quinoa varieties. International Journal of Biological Macromolecules. 2017. p. 315–22.
15.
Kashaninejad M, Maghsoudlou Y, Rafiee S, Khomeiri M. Study of hydration kinetics and density changes of rice (tarom mahali) during hydrothermal processing. Journal of Food Engineering. 2007. p. 1383–90.
16.
Koziol M. Afrosimetric estimation of threshold saponin concentration for bitterness in quinoa (chenopodium-quinoa willd). Journal of the Science of Food and Agriculture. 1991. p. 211–9.
17.
Kozio L M. Chemical composition and nutritional evaluation of quinoa (chenopodium quinoa willd. Journal of Food Composition and Analysis. 1992. p. 35–68.
18.
Li G, Zhu F. Physicochemical properties of quinoa flour as affected by starch interactions. Food Chemistry. 2017. p. 1560–8.
19.
Lucas T, Le Ray D, Mariette F. Kinetics of water absorption and solute leaching during soaking of breakfast cereals. Journal of Food Engineering. 2007. p. 377–84.
20.
Machado M, Oliveira F, Cunha L. Effect of milk fat and total solids concentration on the kinetics of moisture uptake by ready-to-eat breakfast cereal. International Journal of Food Science and Technology. 1999. p. 47–57.
21.
Montgomery D. Design and analysis of experiments. 1991.
22.
Mota C, Nascimento A, Santos M, Delgado I, Coelho I, Rego A. Journal of Food Composition and Analysis. 2016. p. 57–64.
23.
Navruz-Varli S, Sanlier N. Nutritional and health benefits of quinoa (chenopodium quinoa willd. Journal of Cereal Science. 2016. p. 371–6.
24.
Nickel J, Spanier L, Botelho F, Gularte M, Helbig E. Effect of different types of processing on the total phenolic compound content, antioxidant capacity, and saponin content of chenopodium quinoa willd grains. Food Chemistry. 2016. p. 139–43.
25.
Pabis S, Jayas D, Cenkowski S. Grain drying: theory and practice. John Wiley and Sons; 1998.
26.
Peiretti P, Gai F, Tassone S. Fatty acid profile and nutritive value of quinoa (chenopodium quinoa willd.) seeds and plants at different growth stages. Animal Feed Science and Technology. 2013. p. 56–61.
27.
Quispe-Fuentes I, Vega-Galvez A, Miranda M, Lemus-Mondaca R, Lozano M, Ah-Hen K. A kinetic approach to saponin extraction during washing of quinoa (chenopodium quinoa willd.) seeds. Journal of Food Process Engineering. 2013. p. 202–10.
28.
Ridout C, Price K, Dupont M, Parker M, Fenwick G. Quinoa saponins-analysis and preliminary investigations into the effects of reduction by processing. Journal of the Science of Food and Agriculture. 1991. p. 165–76.
29.
Ruales J, Nair B. Saponins, phytic acid, tannins and protease inhibitors in quinoa (chenopodium-quinoa. 1993.
30.
K San Martin R, Briones R. Quality control of commercial quillaja (quillaja saponaria molina) extracts by reverse phase HPLC. Journal of the Science of Food and Agriculture. 2000. p. 2063–8.
31.
Srichuwong S, Curti D, Austin S, King R, Lamothe L, Gloria-Hernandez H. Physicochemical properties and starch digestibility of whole grain sorghums, millet, quinoa and amaranth flours, as affected by starch and non-starch constituents. Food Chemistry. 2017. p. 1–10.
32.
Torrez Irigoyen R, Giner S. Drying-toasting kinetics of presoaked soybean in fluidised bed. experimental study and mathematical modelling with analytical solutions. Journal of Food Engineering. 2014. p. 31–9.
33.
Van Boekel M. 12 World Congress of Food Science and Technology. Comprehensive Reviews in Food Science and Food Safety. 2008. p. 144–58.
34.
Varzakas T, Leach G, Israilides C, Arapoglou D. Theoretical and experimental approaches towards the determination of solute effective diffusivities in foods. Enzyme and Microbial Technology. 2005. p. 29–41.
35.
Vega-Galvez A, Miranda M, Vergara J, Uribe E, Puente L, Martinez E. Nutrition facts and functional potential of quinoa (chenopodium quinoa willd.), an ancient andean grain: a review. Journal of the Science of Food and Agriculture. 2010. p. 2541–7.
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