Abstract
Silver nanoparticles were synthesized by a bio-reduction method which using an aqueous extracted solution of mullein leaves as a reducing and stabilizing agent. The effects of synthesis parameters such as reaction time, temperature and concentration of leaves-extracted solution were studied on the properties of biosynthesized silver nanoparticles. The formed silver nanoparticles were characterized by scanning electron microscopy which is equipped with energy dispersive X-ray spectroscopy, transmission electron microscopy, and X-ray diffraction. The formation of silver nanoparticles at different condition was followed by UV-Vis absorption spectroscopy. The electron microscopy images were confirmed by the formation of monodisperse silver nanoparticles with a spherical shape and their average size is around 30nm which was confirmed with X-ray diffraction results. The bio-reduction rate of silver ions was very slowly up to 1h however, the color changes completed after 5h and resulted in the appearance of the absorbance peak around 430 nm. Moreover, the wound dressing was treated with biosynthesized silver nanoparticles by the exhaustion method and they showed good antibacterial activity.
Highlights
Silver nanoparticle is a good suggestion for applications in medical, pharmaceutical and textile industry [1,2] due to its good antibacterial properties
The SEM image (Fig. 1(a)) shows that the synthesized particles are fairly polydispersed and the Energy Dispersive X-ray spectroscopy (EDX) analysis (Fig. 1(b)) of the region shown in the SEM image suggests the presence of silver element in our sample
The Surface Plasmon Resonance (SPR) property is depend on the size and shape of AgNPs. This characteristic SPR peak for AgNPs appears in the range of 400-500 nm in UV-Vis spectroscopy [22] and in our case the characteristic SPR of synthesized AgNPs using mullein was centered at 430 nm (Fig. 4(a))
Summary
Silver nanoparticle is a good suggestion for applications in medical, pharmaceutical and textile industry [1,2] due to its good antibacterial properties. The non-toxic materials are used in the green synthesis procedures [3], and the method is an environmentally friendly [4] In this process two components are required to concern in the synthesis of silver nanoparticles; silver salt and reducing agent like plant extract, besides it has a stabilizing agent role [5]. Effects of process parameters such as reaction time, temperature and extract concentration were studied on the synthesized AgNPs. The Mullein leaf plant was purchased from an Iranian traditional shop and washed with distilled water and dried at room temperature. 2.5 Coating of Wound Dressing Whit Synthesized AgNPs In the reaction flask, a piece of the wound dressing (4 × 4 cm) was immersed in 50 ml of AgNPs with a material to liquor ratio of 1:50 for 2 h at 50°C, rinsed with distilled water, and dried at room temperature
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