Amylose content of starch controls the release of encapsulated bioactive agents
1988
Wing, R.E. | Maiti, S. | Doane, W.M.
Controlled release of the herbicide butylate [S-ethyl bis (2-methylpropyl) carbamothioate] from a non-chemically modified starch matrix has been achieved. Steam injection cooking of corn-starch or mixtures of starches with varying amylose content, followed by active agent addition, drying and grinding yields encapsulated products showing controlled slow release of active agent. As the amylose content increases, the rate of release decreases due to the ability of amylose to retrograde (starch chain association). As the amylose content is reduced to about 10% the efficiency of active agent encapsulation nears 100%. Encapsulated products consisting only of starch and on active agent should be useful in a variety of applications, i.e. food, feed or agriculture.
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