Peracylated protein-based sutures and fabrics and process for making the same
First Claim
1. A modified suture made by the process comprising the steps of:
- providing a protein-based suture, the protein being selected from the group consisting of silk and collagen;
dispersing the protein-based suture in an essentially non-aqueous medium; and
peracylating the protein with at least two acyl groups per protein molecule by reacting the protein with a cyclic anhydride having a carbon chain substituent comprising at least eight carbon atoms per chain and selected from the group consisting of alkyl and alkenyl groups in the presence of an acid catalyst.
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Abstract
A method for modifying a protein or polypeptide is disclosed which includes the steps of dispersing a protein or polypeptide in an essentially non-aqueous medium and peracylating the protein or polypeptide with a cyclic anhydride having a carbon chain substituent selected from the group consisting of alkyl and alkenyl groups. Most preferably, the cyclic anhydride is succinic anhydride, although glutaric anhydride may also be employed. Preferably, the step of peracylating the protein or polypeptide is performed in the presence of an acid catalyst, most preferably ρ-toluene sulfonic acid. The resultant modified protein or polypeptide may be employed in numerous applications including drug delivery, absorbable sutures, and thermoplastic films and molded articles.
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Citations
18 Claims
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1. A modified suture made by the process comprising the steps of:
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providing a protein-based suture, the protein being selected from the group consisting of silk and collagen;
dispersing the protein-based suture in an essentially non-aqueous medium; and
peracylating the protein with at least two acyl groups per protein molecule by reacting the protein with a cyclic anhydride having a carbon chain substituent comprising at least eight carbon atoms per chain and selected from the group consisting of alkyl and alkenyl groups in the presence of an acid catalyst. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A modified fabric made by the process comprising the steps of:
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providing a fabric comprising protein-based fibers selected from the group consisting of silk and wool;
dispersing the fabric in an essentially non-aqueous medium; and
peracylating the protein with at least two acyl groups per protein molecule by reacting the protein with a cyclic anhydride having a carbon chain substituent comprising at least eight carbon atoms per chain and selected from the group consisting of alkyl and alkenyl groups in the presence of an acid catalyst. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for modifying a fiber comprising the steps of:
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providing a fiber comprising a protein-based polymer selected from the group consisting of collagen, silk and wool;
dispersing the fiber in an essentially non-aqueous medium; and
peracylating the protein with at least two acyl groups per protein molecule by reacting the protein with a cyclic anhydride having a carbon chain substituent comprising at least eight carbon atoms per chain and selected from the group consisting of alkyl and alkenyl groups in the presence of an acid catalyst. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification