Process for microencapsulating cells
First Claim
1. 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.
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Accused Products
Abstract
Oxalate-degrading enzymes and bacteria were encapsulated for both enteric and intraperitoneal administration. We have shown that via alginate microencapsulation of Oxalobacter formigenes, enzymatic activity was retained for several months. A new process was developed which strengthened the aliginate microcapsules and their tolerance to citrate treatment. Much smaller (30-50 μm) aliginate microcapsules were made for injection as means of impantation. For oral administration, multi-encapsulated microspheres of cellulose acetate phthalate in poly-2-vinylpyridine (pKa=3.5) were prepared to protect the enzymes from gastric juices.
86 Citations
13 Claims
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1. In a method for preparing microcapsules of a desired material wherein said method comprises the following steps:
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(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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification