Bioactive capsule has multi-layered sheath of variable porosity

摘要

Bioactive capsule, esp. for installation in a living tissue or for biotechnical use, has a core which contains living cells and/or enzymes and a multi-layered sheath which completely encloses the core. The sheath consists of a porous mesh of flocculated macromolecules. The novelty is that at least 1 layer (7) of the sheath is dissolved or eroded by the action of ionic concn., physical size and/or reagents, causing pores in the structure of the sheath to open, close or change in dia. The max. passage width of the pores is larger than or the same size as the largest cells or enzymes enclosed in the core, to allow them, or their molecular prods., to pass through the sheath.