Vilas Vidya, Philip Daizy, Mathew Joseph
Department of Physics, Mar Ivanios College, Thiruvananthapuram 695015, India; Department of Chemistry, Mar Ivanios College, Thiruvananthapuram 695015, India.
Department of Physics, Mar Ivanios College, Thiruvananthapuram 695015, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2014 Nov 11;132:743-50. doi: 10.1016/j.saa.2014.05.046. Epub 2014 Jun 13.
There are numerous reports on phytosynthesis of silver nanoparticles and various phytochemicals are involved in the reduction and stabilization. Pure explicit phytosynthetic protocol for catalytically and biologically active silver nanoparticles is of importance as it is an environmentally benign green method. This paper reports the use of essential oil of Myristica fragrans enriched in terpenes and phenyl propenes in the reduction and stabilization. FTIR spectra of the essential oil and the synthesized biogenic silver nanoparticles are in accordance with the GC-MS spectral analysis reports. Nanosilver is initially characterized by an intense SPR band around 420 nm, followed by XRD and TEM analysis revealing the formation of 12-26 nm sized, highly pure, crystalline silver nanoparticles. Excellent catalytic and bioactive potential of the silver nanoparticles is due to the surface modification. The chemocatalytic potential of nanosilver is exhibited by the rapid reduction of the organic pollutant, para nitro phenol and by the degradation of the thiazine dye, methylene blue. Significant antibacterial activity of the silver colloid against Gram positive, Staphylococcus aureus (inhibition zone--12 mm) and Gram negative, Escherichia coli (inhibition zone--14 mm) is demonstrated by Agar-well diffusion method. Strong antioxidant activity of the biogenic silver nanoparticles is depicted through NO scavenging, hydrogen peroxide scavenging, reducing power, DPPH and total antioxidant activity assays.
关于银纳米颗粒的植物合成有大量报道，多种植物化学物质参与了其还原和稳定过程。用于催化和生物活性银纳米颗粒的纯明确植物合成方案很重要，因为它是一种环境友好的绿色方法。本文报道了富含萜类和苯丙烯类的肉豆蔻精油在还原和稳定过程中的应用。精油和合成的生物源银纳米颗粒的傅里叶变换红外光谱与气相色谱 - 质谱光谱分析报告一致。纳米银最初的特征是在420nm左右有一个强烈的表面等离子体共振带，随后的X射线衍射和透射电子显微镜分析表明形成了尺寸为12 - 26nm、高度纯净的结晶银纳米颗粒。银纳米颗粒优异的催化和生物活性潜力归因于表面改性。纳米银的化学催化潜力通过有机污染物对硝基苯酚的快速还原以及噻嗪染料亚甲基蓝的降解得以体现。通过琼脂孔扩散法证明了银胶体对革兰氏阳性菌金黄色葡萄球菌（抑菌圈 - 12mm）和革兰氏阴性菌大肠杆菌（抑菌圈 - 14mm）具有显著的抗菌活性。通过一氧化氮清除、过氧化氢清除、还原能力、二苯基苦味酰基自由基和总抗氧化活性测定法描绘了生物源银纳米颗粒强大的抗氧化活性。
