DEVELOPMENT OF A CONTINUOUS METHOD FOR PUFFING AMARANTH (AMARANTHUS SPP.) SEEDS
Amaranth (Amaranthus spp.) is a nutritionally dense pseudocereal grown mostly in South America and Asia. Traditionally amaranth seeds are puffed using a hot skillet. Besides being a batch system, in this process there is little control over the temperature and the residence time of the seeds. We have developed a continuous technique for puffing amaranth seeds using a single-screw extruder with a tapered screw without a die. With this technique we could control the temperature and the residence time for puffing the seeds. It was found that the puffing efficiency of amaranth seeds was a function of temperature and screw speed. The maximum efficiency of 86% was achieved at a barrel temperature of 290C and screw speed of 125 rpm. Sensory analyses with an untrained panel of 33 subjects using samples generated at conditions with puffing efficiency above 75% showed that the sample processed at 250C and 75 rpm was the most acceptable in terms of various sensory attributes and overall liking. PRACTICAL APPLICATIONS
The research aims to develop a new continuous process for the puffing of amaranth seeds. The use of an extruder without a die for puffing these seeds is a novel idea. This process could possibly be used for puffing several other seeds and grains, making it a versatile technology. The sensory work conducted in this paper aims at examining the acceptance of this relatively new product among U.S. consumers.
Document Type: Research Article
Publication date: April 1, 2009