DYNAMIC MECHANICAL-PROPERTIES OF ELASTIN
DYNAMIC MECHANICAL-PROPERTIES OF ELASTIN
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DOI：
10.1002/bip.1979.360180818
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发表时间：
1979-01-01
期刊：
影响因子：
2.9
通讯作者：
FRENCH, CJ
中科院分区：
文献类型：
--
作者：
GOSLINE, JM;FRENCH, CJ
研究了水胀牛弹性蛋白在生理条件下的动态力学性能。当弹性蛋白作为一个封闭的、固定体积的系统进行测试时，力学数据可以通过温度变化来产生主曲线。36度水合弹性蛋白的主曲线。C（含水量，0.46 g水/g蛋白质）和55度。C（含水量，0.41 g/g），在两种情况下弹性蛋白都经历了玻璃化转变，玻璃化转变温度分别为-46度和-21度。C,分别。用于构建主曲线的温移数据遵循WLF方程，并且玻璃化转变似乎具有非晶，随机聚合物网络的特征。弹性蛋白作为一个开放的变体积系统，随着温度的变化可以自由地改变其膨胀体积，其动态力学性能似乎几乎与温度无关。没有观察到玻璃化转变，因为弹性蛋白膨胀随着温度的降低而增加，而含水量的增加使弹性蛋白远离其玻璃化转变。弹性蛋白的疏水特性，导致了弹性蛋白不寻常的膨胀特性，显然进化为冷血的低等脊椎动物提供了一种不受温度影响的弹性体。
The dynamic mechanical properties of water-swollen bovine [elastin] under physiological conditions were investigated. When elastin is tested as a closed, fixed-volume system, mechanical data could be temperature shifted to produce master curves. Master curves for elastin hydrated at 36.degree. C (water content, 0.46 g water/g protein)and 55.degree. C (water content, 0.41 g/g) were constructed, and in both cases elastin went through a glass transition, with the glass transition temperatures of -46 and -21.degree. C, respectively. Temperature shift data used to construct the master curves follow the WLF equation, and the glass transition appears to be characteristic of an amorphous, random-polymer network. For elastin tested as an open, variable-volume system free to change its swollen volume as temperature is changed, dynamic mechanical properties appear to be virtually independent of temperature. No glass transition is observed because elastin swelling increases with decreased temperature, and the increase in water content shifts elastin away from its glass transition. The hydrophobic character of elastin, which gives rise to the unusual swelling properties of elastin, apparently evolved to provide a temperature-independent elastomer for the cold-blooded, lower vertebrates.