Kinetics of the complex formation of silica nanoparticles with collagen

Kinetics of the complex formation of silica nanoparticles with collagen
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二氧化硅纳米颗粒与胶原蛋白复合物形成的动力学

DOI:
10.1038/s41428-021-00553-4
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发表时间:
2021
期刊:
影响因子:
2.8
通讯作者:
Terao Ken
Terao Ken
中科院分区:
化学3区
文献类型:
--
作者:
Otsubo Mari;Terao Ken

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在pH = 3和4的缓冲液中,在25 °C下,对带负电荷的二氧化硅纳米颗粒(SiNP)和带正电荷的端肽胶原(AC)的混合溶液进行时间分辨小角X射线散射测量,其中来自AC分子的散射强度在所研究的dq(散射矢量的大小)范围内非常弱。SiNPs和AC的两种溶液快速混合后,在低端和中端的SiNPs的散射强度分别逐渐增加和减少,并在约5-20 min达到渐近值。这清楚地表明SiNP-AC复合物的结构形成是在分钟的时间尺度上。此外,混合后30分钟的结构因子与先前在15 °C下研究的SiNP和三螺旋AC的数据一致。所获得的形成复合物的时间尺度可以是在胶原分子的帮助下控制SiNP的聚集结构的重要信息。
Time-resolved small-angle X-ray scattering measurements were made for a mixed solution of negatively charged silica nanoparticles (SiNPs) and positively charged atelocollagen (AC) in buffers at pH = 3 and 4 at 25 °C, in which the scattering intensity from the AC molecules was very weak in the investigatedq(magnitude of the scattering vector) range. The scattering intensity from the SiNPs at the lowqend and middleqrange gradually increased and decreased, respectively, and reached asymptotic values approximately 5–20 min after rapid mixing of the two solutions of SiNPs and AC. This clearly shows that the structural formation of the SiNP–AC complex is on the time scale of minutes. Furthermore, the structure factor at 30 min after mixing is consistent with the previously investigated data for SiNPs and triple helical AC at 15 °C. The obtained time scale to form the complex can be important information to control the aggregating structure of SiNPs with the aid of collagen molecules.
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