Polymeric particles having a biodegradable gelatin or aminodextran coating and process for making same
First Claim
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1. Discrete colloidal particles having a surface coating provided with a plurality of pendent functional groups, said particles consisting:
- (a) a polymeric, non-gelatin, non-aminodextran core selected from the group consisting of polymeric substances which have surface amine-reactive functional groups and polymeric substances which do not have surface amine-reactive groups;
(b) said coating selected from the group consisting of a type A, acid cured gelatin of Bloom in the range of about 60 to 300 and an aminodextran;
(i) said gelatin coating being crosslinked by a chemical crosslinking agent, or(ii) said aminodextran coating having a molecular weight in the range of 10,000 to 2 million, and,(1) always being crosslinked by a chemical crosslinking agent when said aminodextran is coating a core substance which does not have surface amine-reactive groups or(2) being either not crosslinked or crosslinked by a chemical crosslinking agent when said aminodextran is coating the surface of a core substance which has surface amine-reactive groups and said coating is by covalent coupling of said aminodextran to said core surface by a reaction between said amine-reactive groups and aminodextran amine groups; and
(c) functional groups covalently attached to said gelatin and aminodextran coatings.
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Abstract
Gelatin and aminodextran coated polymer core particles useful in immunoassays and methods of making the same are disclosed. The preparation of aminodextrans having varying amounts of amine groups is also described, as is a method of crosslinking gelatin and aminodextran without the use of a stabilizer.
82 Citations
16 Claims
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1. Discrete colloidal particles having a surface coating provided with a plurality of pendent functional groups, said particles consisting:
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(a) a polymeric, non-gelatin, non-aminodextran core selected from the group consisting of polymeric substances which have surface amine-reactive functional groups and polymeric substances which do not have surface amine-reactive groups; (b) said coating selected from the group consisting of a type A, acid cured gelatin of Bloom in the range of about 60 to 300 and an aminodextran; (i) said gelatin coating being crosslinked by a chemical crosslinking agent, or (ii) said aminodextran coating having a molecular weight in the range of 10,000 to 2 million, and, (1) always being crosslinked by a chemical crosslinking agent when said aminodextran is coating a core substance which does not have surface amine-reactive groups or (2) being either not crosslinked or crosslinked by a chemical crosslinking agent when said aminodextran is coating the surface of a core substance which has surface amine-reactive groups and said coating is by covalent coupling of said aminodextran to said core surface by a reaction between said amine-reactive groups and aminodextran amine groups; and (c) functional groups covalently attached to said gelatin and aminodextran coatings. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. Colloidal particles comprising:
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(a) a core of a non-gelatin, non-aminodextran polymeric substance selected from the group consisting of a polymer-only substance, a polymeric substance embedded with magnetic particles and a polymeric substance coating a magnetic nucleus; (b) a coating on the surface of the core of (a) selected from the group consisting of a type A, acid cured gelatin of Bloom in the range of about 60 to 300 and an aminodextran having a molecular weight in the range of 10,000 to 2 million; (c) a substance selected from the group consisting of polyclonal antibodies, monoclonal antibodies and biological cells; and (d) a bridging group covalently bound to both said gelatin or aminodextran coating and the selected substance of step (c). - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification