Coating processes – Particles – flakes – or granules coated or encapsulated – Solid encapsulation process utilizing an emulsion or...
Patent
1987-07-10
1990-03-27
Terapane, John F.
Coating processes
Particles, flakes, or granules coated or encapsulated
Solid encapsulation process utilizing an emulsion or...
264 41, 424410, 424488, 42840224, 514965, 71 6411, 71DIG1, 426103, B01J 1302, A61J 307
Patent
active
049119524
ABSTRACT:
Chemical biological agents to be encapsulated are blended into an aqueous dispersion of an unmodified starch comprising about 5% to about 25% by weight amylose. The dispersion, having an initial starch solids content of about 20% by weight, is characterized by completely disrupted starch granules and completely disassociated amylose molecules that are not significantly depolymerized. Subsequent drying is accomplished by reassociation of the amylose molecules which converts the dispersion into a protective matrix and binds the agents within the interstices of the reassociating starch chains. Rate of release of agents to the environment can be altered by varying the proportion of amylose in the starch. Encapsulation of biologically active compositions provides protection against degradative environmental conditions, improves safety in handling, and slows the release of such compounds to the surrounding medium.
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Doane William M.
Maiti Sukumar
Wing Robert E.
Fado John D.
Geist Gary L.
Ribando Curtis P.
Silverstein M. Howard
Terapane John F.
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