壳聚糖
铂纳米粒子
胶体
纳米颗粒
材料科学
阳离子聚合
稳定器(航空)
核化学
铂金
化学
催化作用
纳米技术
有机化学
高分子化学
机械工程
工程类
作者
Garima Sharma,Soo Chan Park,Rajkumar Bandi,Juhee Ahn,Madhusudhan Alle,Jin‐Chul Kim
出处
期刊:Nanotechnology
[IOP Publishing]
日期:2021-08-19
卷期号:32 (45): 455603-455603
被引量:9
标识
DOI:10.1088/1361-6528/ac1afa
摘要
Here, for the first time, we have developed a novel green synthesis method where chitosan acts as a reducing agent and as a colloidal stabilizer, together with polyquaternium for the synthesis of platinum nanoparticles (PtNPs). It was observed that only chitosan-stabilized PtNPs (Ch@PtNPs) were stable up to pH 5, with a diameter of around 89 nm. The diameter of the Ch@PtNPs increased with the increase in pH, indicating the instability of Ch@PtNPs at neutral and alkaline mediums. However, when polyquaternium (PQ) (a cationic polymer) was added as a stabilizer along with chitosan, the diameter of chitosan/polyquaternium stabilized PtNPs (Ch/PQ@PtNPs), i.e. 87 nm, remained almost constant up to pH 9. Similarly, the pH-dependent decrease in the surface charge of Ch@PtNPs was also attenuated with the addition of polyquaternium. This indicates high colloidal stability of Ch/PQ@PtNPs in acidic, neutral, as well as alkaline mediums. It was observed that Ch/PQ@PtNPs exhibited high antibacterial activity againstStaphylococcus aureus, as compared to uncapped PtNPs and Ch@PtNPs. Thus, the addition of PQ increases the antibacterial properties of Ch/PQ@PtNPs againstStaphylococcus aureusby enhancing the stability of PtNPs at neutral pH.
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