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The optimum operation conditions of a GABA tea powder extrudate

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  131589451,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: @2013
Authors:   Jinchyau Peng, His-Kai Tang, Fu-Liang Hong
Keywords:   GABA tea; Corn grits; Extrudate; RSM; Optimum

Abstract. GABA tea (which has high contains of γ-aminobutyric acid ) is good for human healthy. In order to increase the diversity of applications of GABA tea, different proportion of GABA tea powder were added into corn grits and processed by the extrusion technology to develop a puffed snack foods. Response surface methodology (RSM) was used to analyze the effects of screw speed (179 rpm, 200 rpm, 250 rpm, 300 rpm, 321 rpm) and GABA tea powder levels (6%, 8%, 13%, 18%, 20%) on the objective attributes of a corn-based GABA tea powder extrudates. Areas of optimum performance were located by superimposing contour graphs for longitudinal expansion, maximum shear force, hardness and water solubility index for GABA tea powder and screw speed levels, which established limits of acceptable quality for each factor. Individual contour plots of the different responses were overlaid, and regions meeting the optimum longitudinal expansion of 18.3~18.7 (cm/gw), maximum shear force of 5.1~5.3 (N), hardness of 37~40 (N), and water solubility index of 9.1~9.5 (%) were identified at the screw speed of 230~250 rpm and the GABA tea powder level of 12~14 %. The technique of produce a GABA tea powder extrudate was development and it could be commercialized.

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