Abstract
Effect of chemical composition and applied strain on mechanical properties of gelled gelatin-rich micro-particles resulting from phase separated gelatin/pullulan mixtures has been investigated. The mechanical properties of micro-particles(20-120 mu m) were measured using a micromanipulation technique. The compress-release tests revealed that at a low deformation (up to 0% strain) particles are fully elastic with Young's modulus proportional to the concentration of gelatin and at the higher deformation (up to 50-80%) particles are visco-elastic. Even at very high load resulting in 50-60% deformation, no fracture of particles was observed and after the load was removed, particles recovered to a fully spherical shape. The visco-clastic behaviour was investigated by a stress-relaxation method, where force relaxation at constant deformation was measured as a function of time. The experimental results were analysed using a standard liner model of visco-clastic solids and the parameters of this model were related to the composition of gelled particles. (C) 2007 Elsevier Ltd. All rights reserved.
| Original language | English |
|---|---|
| Pages (from-to) | 307-314 |
| Number of pages | 8 |
| Journal | Journal of Food Engineering |
| Volume | 86 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 1 Jun 2008 |
Keywords
- standard linear model
- gelled micro-particles
- mechanical properties
- gelatin-rich phase