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首页> 外文期刊>Biomaterials Science >Quantitative study on the antifreeze protein mimetic ice growth inhibition properties of poly(ampholytes) derived from vinyl-based polymers
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Quantitative study on the antifreeze protein mimetic ice growth inhibition properties of poly(ampholytes) derived from vinyl-based polymers

机译:乙烯基聚合物衍生的两性电解质的抗冻蛋白模拟冰生长抑制特性的定量研究

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摘要

Antifreeze (glyco) proteins (AF(G)Ps) from the blood of polar fish species are extremely potent ice recrystallization inhibitors (IRI), but are difficult to synthesise or extract from natural sources. Despite this challenge, materials which display IRI are appealing due to their ability to enhance cellular cryopreservation, for applications including regenerative and transplantation medicine. Here, poly(ampholytes), which contain a mixture of cationic and anionic side chains are quantitatively evaluated for their IRI activity. Poly(aminoethyl methacrylate), obtained by RAFT polymerization, is functionalised with succinic anhydride to generate the poly(ampholytes). The charge balance of the side chains is shown to be crucial, with only 50:50 mixtures having strong IRI activity, which also scales with molecular weight. This is the first example of a non-hydroxylated synthetic polymer with quantifiable IRI activity and raises questions about the mechanism of IRI, as the polymers have no obvious ice-binding motif. The ampholytic structure is shown to be transferable to carbohydrate-centred polymers with activity retained, but poly(betaines) are shown to be inactive.
机译:极地鱼类血液中的抗冻(糖)蛋白(AF(G)Ps)是极有效的冰重结晶抑制剂(IRI),但很难从天然来源合成或提取。尽管存在这一挑战,但显示IRI的材料仍具有吸引力,因为它们具有增强细胞冷冻保存的能力,可用于再生医学和移植医学。在此,定量评估包含阳离子和阴离子侧链混合物的聚两性电解质的IRI活性。通过RAFT聚合获得的聚(甲基丙烯酸氨基乙酯)用琥珀酸酐官能化以生成聚(两性电解质)。侧链的电荷平衡被证明是至关重要的,只有50:50的混合物具有很强的IRI活性,并且也随分子量而缩放。这是具有可量化的IRI活性的非羟基化合成聚合物的第一个实例,并提出了有关IRI机理的问题,因为这些聚合物没有明显的冰结合基序。该两性结构显示出可转移至以糖为中心的聚合物,并保留了活性,但聚(甜菜碱)却无活性。

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