Improved physical properties of zein using glyoxal as a crosslinker

AGRO 198

Kristen K. Woods, kristen.woods@ars.usda.gov, Plant Polymer Research Unit, National Center for Agricultural Utilization Research, USDA/ARS, 1815 N. University St., Peoria, IL 61604 and Gordon W. Selling, sellingg@ncaur.usda.gov, Plant Polymer Research, USDA-Agricultural Research Service, National Center for Agricultural Utilization Research, 1815 N. University St., Peoria, IL 61604.
The effect of the crosslinkers, glyoxal, methylglyoxal, and formaldehyde, on the physical properties of zein films was studied. Crosslinker concentrations varied from 0.3-6% by zein weight. Films crosslinked with glyoxal and formaldehyde showed a significant increase in tensile strength under certain pH conditions. Films of glyoxal reactions conducted at basic pH gave the highest overall tensile strength, with a 52% increase compared to the control film. Formaldehyde films had improved tensile strength when reacted at acidic or neutral pH. Methylglyoxal had no effect on the tensile strength of zein films. Zein films crosslinked with glyoxal or formaldehyde were found to swell, rather than degrade, when placed in three compatible solvents. Films crosslinked with glyoxal were resistant to boiling water. Denaturing gel electrophoresis of glyoxal and formaldehyde reactions showed the presence of high molecular weight moieties when compared to control reactions.
 

Agricultural Biomass, Biobased Products, and Biofuels
8:30 AM-12:10 PM, Thursday, March 29, 2007 McCormick Place South -- Room S103D, Level 1, Oral

Division of Agrochemicals

The 233rd ACS National Meeting, Chicago, IL, March 25-29, 2007