Etlingera elatior-Mediated Synthesis of Gold Nanoparticles and Their Application as Electrochemical Current Enhancer
Etlingera elatior-Mediated Synthesis of Gold Nanoparticles and Their Application as Electrochemical Current Enhancer
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DOI：
10.3390/molecules24173141
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发表时间：
2019-09-01
期刊：
影响因子：
4.6
通讯作者：
Jambari, Nuzul Noorahya
中科院分区：
文献类型：
--
作者：
Azri, Farah Asilah;Selamat, Jinap;Jambari, Nuzul Noorahya
这项工作提出了一种简单的绿色合成金纳米颗粒（AuNPs）的方法，该方法使用了火把姜（Etlingera elatia）的水提取物。已知叶黄素中存在的代谢物，包括糖、蛋白质、多酚和类黄酮，在还原金属离子和支持纳米颗粒随后的稳定性方面发挥重要作用。本研究的目的是研究南芥提取物通过还原氯化金（III）水合物合成AuNPs的能力，并表征所产生的纳米颗粒的性质。通过测定其总酚和总黄酮含量，评价其抗氧化性能。为了确定AuNPs的形成，利用紫外可见光谱（UV-Vis）、傅里叶变换红外光谱（FTIR）、高分辨率透射电子显微镜（HRTEM）、能量色散x射线（EDX）显微镜和动态光散射（DLS）测量对合成颗粒进行了表征。绿色合成的AuNPs的性质与使用传统还原剂柠檬酸钠生产的AuNPs相当。紫外-可见光谱测量了AuNPs的表面等离子体共振，得到了一个以529 nm为中心的条带。FTIR结果证明，提取物中含有O-H官能团，该官能团负责覆盖纳米颗粒。HRTEM图像显示，合成的绿色AuNPs形状各异，其水动力直径平均为31.5 +/- 0.5 nm。同时，zeta电位为-32.0 +/- 0.4 mV，表明AuNPs具有较高的稳定性和负电荷。我们进一步成功证明，使用绿色合成的AuNPs作为纳米复合材料修饰丝网印刷碳电极（SPCE/Cs/AuNPs）的工作表面，提高了电子转移速率，并为Cu（II）离子的检测提供了一个灵敏的平台。
This work presents a simple green synthesis of gold nanoparticles (AuNPs) by using an aqueous extract of Etlingera elatior (torch ginger). The metabolites present in E. elatior, including sugars, proteins, polyphenols, and flavonoids, were known to play important roles in reducing metal ions and supporting the subsequent stability of nanoparticles. The present work aimed to investigate the ability of the E. elatior extract to synthesise AuNPs via the reduction of gold (III) chloride hydrate and characterise the properties of the nanoparticles produced. The antioxidant properties of the E. elatior extract were evaluated by analysing the total phenolic and total flavonoid contents. To ascertain the formation of AuNPs, the synthesised particles were characterised using the ultraviolet-visible (UV-Vis) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, high-resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray (EDX) microscopy, and dynamic light scattering (DLS) measurement. The properties of the green synthesised AuNPs were shown to be comparable to the AuNPs produced using a conventional reducing agent, sodium citrate. The UV-Vis measured the surface plasmon resonance of the AuNPs, and a band centered at 529 nm was obtained. The FTIR results proved that the extract contained the O-H functional group that is responsible for capping the nanoparticles. The HRTEM images showed that the green synthesized AuNPs were of various shapes and the average of the nanoparticles' hydrodynamic diameter was 31.5 +/- 0.5 nm. Meanwhile, the zeta potential of -32.0 +/- 0.4 mV indicates the high stability and negative charge of the AuNPs. We further successfully demonstrated that using the green synthesised AuNPs as the nanocomposite to modify the working surface of screen-printed carbon electrode (SPCE/Cs/AuNPs) enhanced the rate of electron transfer and provided a sensitive platform for the detection of Cu(II) ions.