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United States Department of Agriculture

Agricultural Research Service

Title: Biopolymer Citrates: Preparation and Ion Exchange Properties

item Wing, Robert
item Sessa, David

Submitted to: American Chemical Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: August 27, 1998
Publication Date: N/A

Technical Abstract: Several biomass agricultural materials (starch, corn fiber, ground corn cobs, and cellulose fiber) have been reacted thermochemically with citric acid. Citric acid dehydrates at high temperature to form a reactive anhydride, which reacts with hydroxyl groups of carbohydrates. Data is presented to show effect of temperature, citric acid concentration, pH, and reaction time. Reaction efficiencies approaching 100% were achieved, while minimizing cross-linking and maximizing carboxyl content. Biomass carbohydrate makeup (starch, cellulose, hemicellulose) gave products showing variable reaction efficiencies and properties. All products possess high ion exchange capacity and data is presented for nine heavy metals. The potential also exists for one time use to yield biodegradable materials in lieu of petrochemically based resins.

Last Modified: 4/22/2015
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