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Squaric acid mediated bioconjugation expanded to polymers prepared by ATRP

Résumé

The squaric acid mediated bioconjugation reaction is an attractive approach for the amine-selective protein modification with side-chain functional polymers. This manuscript presents 3 squaric acid based atom transfer radical polymerization (ATRP) initiators that significantly expand the scope of this bioconjugation reaction to a broad range of synthetic polymers that can be prepared by ATRP. Two proof-of-principle studies are discussed that demonstrate the feasibility of these novel initiators for the preparation of protein-synthetic polymer conjugates via both the grafting-onto as well as the grafting-from strategy. ATRP of polyethylene glycol methacrylate (PEGMA) with these initiators was used to generate a library of linear, mid-functional and 3-arm squaric acid functionalized PPEGMA derivatives. These PPEGMA polymers could subsequently be grafted onto bovine serum albumin (BSA), which was selected as a model protein. Alternatively, BSA could also be modified with these squaric acid based initiators to afford protein macroinitiators, which were successfully used to mediate ATRP of PEGMA and generate BSAPPEGMA conjugates in a grafting-from process.

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Concepts associés (29)
Polymère
vignette|Fibres de polyester observées au Microscopie électronique à balayage. vignette|La fabrication d'une éolienne fait intervenir le moulage de composites résines/renforts. Les polymères (étymologie : du grec polus, plusieurs, et meros, partie) constituent une classe de matériaux. D'un point de vue chimique, un polymère est une substance composée de macromolécules et issue de molécules de faible masse moléculaire. Un polymère est caractérisé par le degré de polymérisation.
Graft polymer
In polymer chemistry, graft polymers are segmented copolymers with a linear backbone of one composite and randomly distributed branches of another composite. The picture labeled "graft polymer" shows how grafted chains of species B are covalently bonded to polymer species A. Although the side chains are structurally distinct from the main chain, the individual grafted chains may be homopolymers or copolymers.
Chimie macromoléculaire
Polymer chemistry is a sub-discipline of chemistry that focuses on the structures of chemicals, chemical synthesis, and chemical and physical properties of polymers and macromolecules. The principles and methods used within polymer chemistry are also applicable through a wide range of other chemistry sub-disciplines like organic chemistry, analytical chemistry, and physical chemistry. Many materials have polymeric structures, from fully inorganic metals and ceramics to DNA and other biological molecules.
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