摘要:
A process for preparing non-naturally-occurring defined monomer sequence polymers is provided, and in which a high degree of synthetic control is obtained by the use of solvent resistant diafiltration membranes. Also provided is a process for separating non-naturally-occurring defined monomer sequence polymers from synthetic by-products or excess reagents using solvent resistant diafiltration membranes, and a use of a solvent resistant diafiltration membrane in processes for preparing and separating non-naturally-occurring defined monomer sequence polymers.
摘要:
The present invention relates to novel glycerin ether ethoxylate solfactant compounds, compositions employing the same, and methods of using these compounds. Beneficially the compounds have efficacy as both solvents and surfactants with low foam and low viscosity. The compounds of the present invention can be used as antimicrobials and/or sanitizing agents in various formulations. The compounds of the present invention are also suitable for use as solvents and/or hydrotropes.
摘要:
The present invention relates to the field of drug carrier systems and polymer therapeutics and diagnostics. It provides derivatized unimolecular polyols with a hydrophobic core moiety and a polyanionic, preferably, sulfated hydrophilic shell, in particular to unimolecular hyperbranched sulfated polyglycerol micelles having a hydrophilic shell and a hydophobic core. These may be used for the supramolecular encapsulation and transport of hydrophobic guest molecules into biological systems. The micelles can be applied as a drug carrier system for therapy and for diagnosis. They may also be therapeutic agents on their own. The invention also relates to preparation of said micelles.
摘要:
The present invention aims to provide spherical biodegradable particles which have improved flexibility, cause less aggregation among particles, and have improved particle shape-recovering ability after passing through a catheter or the like, and a method for producing the particles. The present invention provides biodegradable particles comprising a synthetic polymer chemically cross-linked to a polyvalent carboxylic acid, which biodegradable particles have a water content of 20 to 90% in the water-saturated state.
摘要:
Provided is a multi-arm polyethylene glycol derivative having a narrow molecular weight distribution. A multi-arm polyethylene glycol derivative represented by the formula (1):
wherein, L represents a group selected from a linear or branched alkylene, arylene, or cycloalkylene group having two or more carbon atoms and combinations thereof, which may have an ether bond in a chain; X represents a dehydroxylation residue of a linear sugar alcohol having 5 or 7 carbon atoms; m is the number of polyethylene glycol chains bonded to X and represents 4 or 6; n is the average addition molar number of oxyethylene groups and n represents an integer of 3 to 600; Y represents a single bond or an alkylene group which may have an ester bond, a urethane bond, an amide bond, an ether bond, a carbonate bond, a secondary amino group, a urea bond, a thioether bond or a thioester bond in a chain or at an end; and Z represents a chemically reactive functional group.
摘要:
Hydrogels that degrade under appropriate conditions of pH and temperature by virtue of crosslinking compounds that cleave through an elimination reaction are described. The hydrogels may be used for delivery of various agents, such as pharmaceuticals. This invention provides hydrogels that degrade to smaller, soluble components in a non-enzymatic process upon exposure to physiological conditions and to methods to prepare them. The hydrogels are prepared from crosslinking agents that undergo elimination reactions under physiological conditions, thus cleaving the crosslinking agent from the backbone of the hydrogel. The invention also relates to the crosslinking agents themselves and intermediates in forming the hydro gels of the invention. The biodegradable hydro gels prepared according to the methods of the invention may be of use in diverse fields, including biomedical engineering, absorbent materials, and as carriers for drug delivery.
摘要:
Disclosed are a monofunctional branched polyethyleneglycol and a bio-related substance modified by same. The general formula of the monofunctional branched polyethyleneglycol is shown in Formula (1), and the general formula of the bio-related substance modified by the polyethyleneglycol is shown in Formula (2), wherein X 1 and X 2 are respectively an alkyl group with 1 to 20 carbon atoms; n 1 and n 2 are respectively an integer ranging from 1 to 1000; n 3 is an integer ranging from 11 to 1000; L 1 and L 2 are respectively a linking group stably existing in illumination, enzyme, acidic, or alkaline conditions; p is 0 or 1, and q is 0 or 1; R1 is a hydrogen atom or an alkyl group with 1 to 20 carbon atoms; D is the bio-related substance; and Z is a linking group, through which a functional group capable of reacting with the bio-related substance is linked to a symmetric axis polyethyleneglycol main chain. The bio-related substance modified by the polyethyleneglycol maintains good biological activity, and has good solubility and long metabolic half-life in an organism.
摘要:
Provided is a multi-arm polyethylene glycol-azido derivative of general formula I, wherein R is a central molecule, which is selected from a polyhydroxy structure, a polyamino structure or a polycarboxyl structure; n is the number of branches or arms, n‰§3; PEG is the same or different -(CH 2 CH 2 O) m -, the average value of m being an integer from 3 to 250; X is a linking group of an azido end group; k is the number of the branches having the azido end group; F is selected from the group consisting of amino, carboxyl, sulfhydryl, ester group, maleic imide group and acrylic group; and Y is a linking group of an end group F.