Energy Consumption during Vacuum Microwave Treatment of Potato Starch: A Phenomenological Model

Abstract

It is known that the water binding capacity of starch increases after vacuum microwave treatment. Microwave radiation absorbed by the starch sample affects its sensible, latent internal and chemical (bond and conformational) energy levels. A phenomenological model was developed based on energy sinks in starch, practically described as increasing temperature, breaking bonds between water and amylopectin/amylose molecules, changing the phase of water from liquid to vapor and structural rearrangements at short (single/double helices) and long (crystalline/amorphous) order. The model was validated by experimental data for different vacuum microwave treatment parameters, viz. incident power (460, 500 and 750 W), duration (30 to 340 s) and sample mass (10 to 70 g) at 4000 Pa. The results provide an insight into the physical aspects of the process and would facilitate its development on an industrial scale.

Physical Modification of Food Starch Functionalities

“…Dyrek et al (2007) found that irradiation of corn and potato starches with microwaves (440 and 800 W) for 10-15 min generated two types of radicals that were similar to those generated by conventional heating of the starches at 210 • C for 30 min. Mollekopf et al (2011a,b), Treppe et al (2011), andDixit et al (2011) studied vacuum microwave (460, 500, 600, 750, 1,000, and 1,500 W) treatment of potato starch (18% moisture; 30-600 s) and found that the starch's water-binding capacity increased. Both granule shrinking and slight cracking of the granule surface occurred, and the granules became less crystalline; however, for the most part, birefringence remained.…”

Inline Determination of Aqueous Diglycolamines CO2 Loading in Dependence of the Viscosity and Temperature

“…B. Monoethanolamin (MEA), Diethanolamin (DEA) oder Diglykolamin (DGA) angewendet. Insbesondere letzteres erscheint für die Reinigung von Biogas auf Biomethan, dessen Produktionsmengen in den kommenden Jahren deutlich ausgebaut werden, vielversprechend . Es kann als wässrige Lösung sehr hochkonzentriert vorliegen und weist dadurch auch bei atmosphärischem Druck eine hohe Differenz in der CO 2 ‐Beladung zwischen Absorptions‐ und Desorptionsbedingungen auf, woraus geringe Waschmittelumlaufraten resultieren.…”