Patent ID: 6242230
Filing Date: 2001-06-05
Classification: A61K,C12N,Y10S

Abstract:
In a method for preparing microcapsules of a desired material wherein said method comprises the following steps:(a) mixing said desired material to be encapsulated with a matrix-forming composition;(b) making droplets of the mixture of part (a) and introducing said droplets into a gelling solution to form droplets;(c) treating the gel droplets formed in part (b) with a polyelectrolyte to form a microcapsule; an improvement which comprises the addition of at least one more polyelectrolyte layer and at least one more matrix-forming layer to the microcapsule of part (c), wherein said polyelectrolyte is positively charged and said matrix-forming composition comprises alginate, wherein a matrix-forming layer is the last layer to be added to said microcapsule, and said microcapsule having a size of less than about 400 .mu.m in diameter.