Journal
CARBOHYDRATE POLYMERS
Volume 140, Issue -, Pages 233-237Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2015.12.034
Keywords
Graft copolymers; Poly-glutamic acid (PGA); Starch
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Funding
- US Department of Agriculture, Agricultural Research Service
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Graft copolymers of waxy maize starch and poly y-glutamic acid (PGA) were produced in an aqueous solution using microwave irradiation. The microwave reaction conditions were optimized with regard to temperature and pH. The temperature of 180 degrees C and pH7.0 were the best reaction conditions resulting in a PGA graft of 0.45% based on nitrogen analysis. The average graft content and graft efficiency for the starch-PGA graft copolymer prepared at 180 degrees C and pH7.0 were 4.20% and 2.73%, respectively. The starch-PGA graft copolymer produced at 180 degrees C and pH7.0 could absorb more than 20 times its own weight amount of water and form a gel. The preliminary rheology study revealed that the starch-PGA graft copolymer gel exhibited viscoelastic solid behavior while the control sample of waxy starch showed viscoelastic liquid behavior. Published by Elsevier Ltd.
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