Kinetics of Starch Degradation during Extrusion Cooking of Steady State Flow Konjac (Amorphophallus oncophyllus) Tuber Flour in a Single Screw Extruder

*Andri Cahyo Kumoro orcid scopus  -  Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro, Indonesia
Diah Susetyo Retnowati  -  Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro, Indonesia
Ratnawati Ratnawati  -  Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro, Indonesia
Received: 11 Jun 2020; Revised: 19 Jul 2020; Accepted: 20 Jul 2020; Published: 1 Aug 2020; Available online: 30 Jul 2020.
Open Access Copyright (c) 2020 Bulletin of Chemical Reaction Engineering & Catalysis
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The presence of glucomannan in Konjac (Amorphophallus oncophyllus) tuber flour has promoted its various applications, especially in the food, drink, drug delivery and cosmetics. Starch is the main impurity of Konjac tuber flour. Although the common wet refining method may result in a high purity Konjac tuber flour, it is very tedious, time consuming and costly. This research aimed to study the kinetics of starch degradation in the extrusion cooking process of dry refining method to produce high quality Konjac tuber flour. In this research, Konjac tuber flour with 20% (w/w) moisture was extruded in a single screw extruder by varying screw speeds (50, 75, 100, 125, 150 and 175 rpm) and barrel temperatures (353, 373, 393, 413 and 433 K). The results showed that the starch extrusion cooking obeys the first reaction order. The reaction rate constant could be satisfactorily fitted by Arrhenius correlation with total activation energy of 6191 J.mol1 and pre-exponential factor of 2.8728×101 s1. Accordingly, thermal degradation was found to be the primary cause of starch degradation, which shared more than 99% of the energy used for starch degradation. Based on mass Biot number and Thiele modulus evaluations, chemical reaction was the controlling mechanism of the process. The results of this research offer potential application in Konjac tuber flour refining process to obtain high quality flour product. Copyright © 2020 BCREC Group. All rights reserved


Keywords: dry process; extrusion cooking; starch; reaction kinetics; glucomannan; refining

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