Structural characterisation of hypoxia-mimicking bioactive glasses.

Structural characterisation of hypoxia-mimicking bioactive glasses.
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模拟缺氧生物活性玻璃的结构表征。

DOI:
10.1039/c3tb00408b
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发表时间:
2013
期刊:
Journal of materials chemistry. B
影响因子:
--
通讯作者:
Smith JM
Smith JM
中科院分区:
--
文献类型:
--
作者:
Smith JM

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已知镍和钴都能刺激缺氧诱导因子-1(HIF-1α),从而显著改善组织工程应用中的血管形成。我们已经制造了镍和钴掺杂的生物活性玻璃作为这些离子的受控输送机制。由此产生的结构后果进行了研究,使用同位素和同构替代的方法应用于中子衍射。存在的结构位点将与它们在生理流体如血浆和唾液中的释放性质密切相关,因此与材料的生物活性密切相关。因此,详细的结构知识是优化材料设计的先决条件。结果表明,镍和钴在这些生物活性玻璃中采用混合结构的作用,占据网络形成(四面体)和网络修饰(5倍)的几何形状。三分之二的镍(或钴)占据了五倍的几何形状,其余的三分之一在四面体环境中。对原型45 S5 Bioglass®与此处研究的Ni和Co玻璃之间的主要结构相关性(例如Si-O、Ca-O、Na-O和O-Si-O)进行的直接比较显示无显著差异。这表明添加Ni(或Co)对现有结构没有不利影响,因此对这些玻璃的体外/体内溶解速率和生物活性没有不利影响。
Nickel and cobalt are both known to stimulate the hypoxia-inducible factor-1 (HIF-1α), thus significantly improving blood vessel formation in tissue engineering applications. We have manufactured nickel and cobalt doped bioactive glasses to act as a controlled delivery mechanism of these ions. The resultant structural consequences have been investigated using the methods of isotopic and isomorphic substitution applied to neutron diffraction. The structural sites present will be intimately related to their release properties in physiological fluids such as plasma and saliva, and hence the bioactivity of the material. Detailed structural knowledge is therefore a prerequisite for optimising material design. Results show that nickel and cobalt adopt a mixed structural role within these bioactive glasses occupying both network-forming (tetrahedral) and network-modifying (5-fold) geometries. Two thirds of the Ni (or Co) occupies a five-fold geometry with the remaining third in a tetrahedral environment. A direct comparison of the primary structural correlations (e.g. Si–O, Ca–O, Na–O and O–Si–O) between the archetypal 45S5 Bioglass® and the Ni and Co glasses studied here reveal no significant differences. This indicates that the addition of Ni (or Co) will have no adverse effects on the existing structure, and thus on in vitro/in vivo dissolution rates and therefore bioactivity of these glasses.
通过中子衍射测定非晶材料的结构因子
DOI: --
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通过固态核磁共振波谱和准确的第一原理模拟对 45S5 生物玻璃原子结构的新见解
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DOI: 10.1107/s0909049505012719
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影响因子: 2.5
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Ravel, B;Newville, M
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Richard A. Martin;Helen L. Twyman;Gregory J Rees;E. Barney;R. Moss;Jodie M. Smith;R. Hill;G. Cibin;T. Charpentier;Mark E. Smith;J. Hanna;R. J. Newport
通讯作者: Richard A. Martin;Helen L. Twyman;Gregory J Rees;E. Barney;R. Moss;Jodie M. Smith;R. Hill;G. Cibin;T. Charpentier;Mark E. Smith;J. Hanna;R. J. Newport
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影响因子: 8.6
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