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Effect of Extrusion Cooking on Physical Properties and Chemical Composition of Corn‐Based Snacks Containing Amaranth and Quinoa: Application of Partial Least Squares Regression
Author(s) -
Ramos Diaz Jose Martin,
Sundarrajan Lakshminarasimhan,
Kariluoto Susanna,
Lampi AnnaMaija,
Tenitz Seppo,
Jouppila Kirsi
Publication year - 2017
Publication title -
journal of food process engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.507
H-Index - 45
eISSN - 1745-4530
pISSN - 0145-8876
DOI - 10.1111/jfpe.12320
Subject(s) - amaranth , food science , partial least squares regression , extrusion , chemistry , water content , materials science , mathematics , composite material , statistics , geotechnical engineering , engineering
The effects of amaranth and quinoa supplements and extrusion‐cooking on the physical properties and chemical composition of corn‐based extrudates were investigated by using PLSR and L‐PLSR. Grain type, content of amaranth or quinoa flour (20–50% of solids of blend), temperature of die (140–160°C), screw speed (200–500 rpm), water content of mixture (14–18%) as well as contents of protein, ash, dietary fiber and main fatty acids of blend were the predictors in the PLSR and L‐PLSR. Water content of mixture and screw speed had the distinctly greatest importance for physical response variables such as torque and pressure at the die during extrusion, SEI , stiffness and water content of extrudate. Extrusion reduced the content of fatty acids and tocopherols in the solids but it had only a slight effect on the content of total phenolic compounds and folate. This study proved that extrudates containing up to 50% amaranth or quinoa can maintain some key physical properties (e.g., high SEI , low stiffness) and the added nutritional value (e.g., increased content of folate). This study applied successfully PLSR and L‐PLSR modeling techniques to study the incorporation of amaranth and quinoa to corn‐based snacks. Practical Applications It was possible to add up to 50% amaranth and quinoa and still, obtain expanded corn‐based extrudates. The incorporation of these grains increased the nutritional value of corn‐based extrudates, having little effect on their expansion and stiffness. Amaranth and quinoa could have a tremendous potential for the development of gluten‐free extruded snacks.