Particles prepared by transacylation reaction between an esterified polysaccharide and a polyamine, methods of preparation therefor and compositions containing same

摘要

PCT No. PCT/FR94/00409 Sec. 371 Date Jul. 20, 1995 Sec. 102(e) Date Jul. 20, 1995 PCT Filed Apr. 13, 1994 PCT Pub. No. WO94/23832 PCT Pub. Date Oct. 27, 1994Particles, preparation methods therefor, and compositions containing same. The particles include at least one esterified polysaccharide and at least one polyamine, as well as at least one gellable polysaccharide when neither the esterified polysaccharide nor the polyamine can be gelled under the selected operating conditions. Said particle includes, at least on its surface, a membrane consisting of the product of the transacylation reaction between the esterified polysaccharide and said polyamine within an optionally gellable gel, said reaction causing the formation of covalent amide bonds. Such particles may be used to encapsulated various active principles useful in the fields of cosmetics, pharmaceuticals and agri-foodstuffs, enzymes, cells and micro-organisms.