Enlarged processing window of plasticized wheat gluten using salicylic acid

Biomacromolecules
N Henrik UllstenMikael S Hedenqvist

Abstract

The temperature window for the extrusion of glycerol-plasticized wheat gluten was increased by the use of salicylic acid, a known scorch retarder and radical scavenger. It was possible to extrude 30 wt % glycerol-wheat gluten films with a die-head temperature as high as 135 degrees C, rather than 95 degrees C, by incorporating only 1 wt % salicylic acid. Small effects of shear-induced heating during extrusion at the higher temperatures suggested that the acid acted as a lubricant and viscosity reducer. The latter was suggested to originate primarily from the salicylic-acid-induced reduction in the degree of protein aggregation/cross-linking, as indicated by size-exclusion high-performance liquid chromatography and chemiluminescence. Electron paramagnetic resonance spectroscopy on extruded films indicated that the beneficial effect of salicylic acid was due to its radical scavenging effect. Tensile tests on extrudates revealed that the materials produced at the substantially higher processing temperature were still ductile. The complex shear modulus increased more slowly with increasing salicylic acid content above 110-120 degrees C, indicating that the aggregation/cross-linking rate was slower with salicylic acid, that is, that...Continue Reading

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Citations

Mar 19, 2011·Biomacromolecules·Thomas O J BlomfeldtMikael S Hedenqvist
Nov 9, 2011·Journal of Agricultural and Food Chemistry·Jun Liang, Richard D Ludescher
Jun 28, 2014·Journal of Agricultural and Food Chemistry·William R NewsonEva Johansson
Feb 16, 2012·ACS Applied Materials & Interfaces·Thomas O J BlomfeldtMikael S Hedenqvist
Nov 3, 2010·International Journal of Biological Macromolecules·S-W ChoM S Hedenqvist
Feb 23, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Faiza RasheedEva Johansson
May 28, 2010·Journal of Agricultural and Food Chemistry·Sung-Woo ChoMikael S Hedenqvist

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