| 摘要 |
<p>The capsule is stable in storage in a concentrated medium and on dilution is ruptured by slight mechanical stressing. Its core is completely enclosed by a matrix. The core is surrounded by multilayers. The casing includes a layer which is bonded electrostatically or covalently with the adjacent layer(s). Layer(s) are applied by solids coating and by membrane-forming fluid coating. At least one layer is formed by coating and complex formation. The core is a spherical droplet formed by precipitation, ionic effects or a temperature gradient. An oil or other material non-miscible with it, e.g. a hydrocarbon or hydrocarbon mixture, surrounds immobilized material in the core matrix. The substance to be immobilized forms a suspension with a second substance in the capsule interior, which forms a phase boundary with the matrix material. Other corresponding forms, e.g. a fluid/fluid emulsion or a solid phase are described. Cells or microorganisms may be contained in the core. Coating is carried out in a fluidized bed or flowing bed process. During drying in this process, additional solid is blown in. This forms a membrane on the capsule surface. All substances involved are food-compatible. Further variants and developments of the microcapsule are described in accordance with the foregoing principles.</p> |
