Matricap® controlled-delivery technology is based on the use of one or more nonpolymer coatings composed of fatty acids, fatty alcohols or esters of these products including salts (e.g., plasticizers), with or without one or more polymer binders, agglomerating agents or additional formulation aids to regulate the release rate and release profile of bioactive agents from solid carrier matrices. Specific gravity, solubility, hydrolysis, and biodegradation interactions of the coating(s), carrier, and bioactive agent in an admixture were utilized to design specific compositions for aquatic or terrestrial pest-management applications. If the formulation components were properly matched, a composition could deliver a bioactive agent to specific surface and/or subsurface areas of an aquatic or terrestrial habitat to target the orientation and/or feeding patterns of pest populations for prolonged periods.
Controlled delivery of insect growth regulators, microbial larvicides, and central nervous system inhibitors used to control mosquito larvae in surface or subsurface areas of a water column were shown to be functions of the type, concentration and/or number of coatings incorporated into a composition. Slight variations in the ratio of two or three fatty acid, fatty alcohol and/or fatty acid ester coatings in a coating complex were observed to significantly increase or decrease the duration of delivery from a solid matrix as well as alter the controlled-release profile and positional distribution of a bioactive agent in an aquatic habitat. The rate and duration of controlled delivery of an insect growth regulator used to control German cockroaches were dependent on the type and concentration of fatty acid ester(s), polymers, and bait complex utilized to fabricate coated, extruded, or continuous film bait stations.