Surface cross-linked particles suitable for controlled delivery
申请人:Biotech Australia PTY Limited
公开号:US06221397B1
公开(公告)日:2001-04-24
Cross-linked particles are provided that are useful for delivery of pharmaceutical agents. The particles comprise at least one polymeric compound and a spacer compound, where the polymeric compound and the spacer each comprise reactive carboxyl, hydrazidyl, amino and/or thiol groups. The particles are cross-linked via covalent linkage of the reactive groups on the polymer and spacer respectively. Compositions comprising pharmaceutical agents contained within the particles are disclosed. Methods for preparing the particles, for encapsulating pharmaceutical agents within the particles, and for using the particles for controlled release of the pharmaceutical agent within the patient also are provided.
METHOD FOR PRODUCING AMINO ACID AMINOALKYL ESTER OR INORGANIC ACID SALT THEREOF
申请人:ASAHI KASEI KABUSHIKI KAISHA
公开号:US20210253517A1
公开(公告)日:2021-08-19
The present invention provides a method for producing an amino acid aminoalkyl ester or an inorganic acid salt thereof by reacting a compound represented by general formula (I) shown below or a compound represented by general formula (III) shown below, or a salt thereof, and at least one compound selected from the group consisting of compounds represented by general formula (IV-I) shown below, compounds represented by general formula (IV-II) shown below, compounds represented by general formula (IV-III) shown below and compounds represented by general formula (IV-IV) shown below, or an inorganic acid salt thereof.
Bonding together tissue with adhesive containing polyfunctional
申请人:Protein Polymer Technolgies, Inc.
公开号:US06033654A1
公开(公告)日:2000-03-07
Proteinaceous polymers having repetitive units from naturally occurring structural proteins are employed as backbones for functionalities for crosslinking to provide strongly adherent tissue adhesives and sealants. Particularly, block copolymers having repeating units of elastin and fibroin are employed having lysine substitutions in spaced apart units, where the amino group can be crosslinked using difunctional crosslinking agents. The protein polymer contains at least 40 weight percent of repetitive units of 3 to 30 amino acids of at least one naturally occurring structural protein and at least two functional groups capable of reacting with a crosslinking agent to form a strongly adherent adhesive composition for bonding together separated tissue or for sealing tissue defects. A preferred adhesive composition contains glutaraldehyde or polymethylene diisocyanate and a protein block copolymer of at least 30 kD containing at least 70 weight percent of repetitive units of Gly-Ala-Gly-Ala-Gly-Ser and Gly-Val-Gly-Val-Pro, where in at least two units an amino acid is substituted with one of lysine or arginine, and the copolymer has a lysine and arginine equivalent weight in the range of 3 to 15 kD. The protein polymer is produced by recombinant DNA technology, and a kit may be formed containing the crosslinking agent and protein polymer.
METHOD FOR PRODUCING CARBAMATE AND METHOD FOR PRODUCING ISOCYANATE
申请人:ASAHI KASEI KABUSHIKI KAISHA
公开号:US20210179548A1
公开(公告)日:2021-06-17
The present invention provides a method for producing a carbamate that includes a step (1) and a step (2) described below:
(1) a step of producing a compound (A) having a urea linkage, using an organic primary amine having at least one primary amino group per molecule and at least one compound selected from among carbon dioxide and carbonic acid derivatives, at a temperature lower than the thermal dissociation temperature of the urea linkage; and
(2) a step of reacting the compound (A) with a carbonate ester to produce a carbamate.