The effectiveness of non‐chemically modified pearl cornstarch as an encapsulating matrix for active agents such as herbicides is reported. Aqueous gelatinization of pearl cornstarch at high temperatures followed by active agent addition, drying and grinding yielded encapsulated products showing slow release of active agent. Efficiency of encapsulation and rate of release of the herbicide butylate varied with temperature and concentration of starch during steam‐jet cooking, amount of butylate incorporated and method of drying. Retrogradation is the major factor influencing efficiency of encapsulation and rate of active agent release.
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Wing et al. (1987) studied this question.
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