| Abstract: | Small Granule Starches and Hydrophilic Polymers as Components for Novel Biodegradable Two-Phase Compounds for Special Applications Part 1: Separation and Refinement Techniques for Small Granule Starches from Amaranth and Quinoa A small technical scale process for the separation and special refinement of small granule starches from amaranth and quinoa seed was developed using basic starch technology and machinery equipment as well as a neutral extraction process with xylanases and other enzymes. By using aqueous alkaline media for starch extraction, instead of water, the native starch structure was irreversibly changed, as indicated by Brabender and RVA peak viscosities as well as damaged starch measurements. The functional properties of these smallest native starch granules (0.5–3.0 μm) were investigated for novel applications in starch-compound products. Extrusion compounding processes for the formation of two-phase compounds from small granule starches and synthetic thermoplastics with polar structure units request native starch structures with high thermal stability. |
