Mempelajari Pengaruh Pre-conditioner, Kecepatan Ulir, dan Substitusi Gandum Utuh Terhadap Ekstrusi

Abstract

Extrusion cooking is the process of forcing a material to flow under a variety of conditions through a shaped hole (die) at a predetermined rate to achieve various resulting products. This research was done to learn the influences of pre-conditioner, screw speed, and whole wheat substitusion in extrusion process.Several extrusion treatments were studied, as follows: pre-conditioner treatment, wheat proportion (0 %, 5 %, and 10 %), and screw speed (350 rpm, 360 rpm, and 370 rpm). Pre-conditioner, wheat proportion, and screw speed found to affect the product in different ways. Pre-conditioning treatment increases the product’s moisture, gelatinisation degree, WSI (Water Solubility Index), WAI (Water Absorbtion Index), hardness and product’s length but it decreases the product’s bulk density. The higher wheat proportion between 0 % to 10 % increases gelatinisation degree, WSI, hardness, and bulk density. On the other hand, increasing of screw speed around 350 rpm to 370 rpm will increases gelatinisation degree, WSI, product’s length, hardness, but decreases product’s expansion degree.