Shape- and Size-Controlled Synthesis of Silver Nanoparticles Using Aloe vera Plant Extract and Their Antimicrobial Activity

Abstract

Biogenic synthesis of silver nanoparticles (AgNP) was performed at room temperature using Aloe vera plant extract in the presence of ammoniacal silver nitrate as a metal salt precursor. The formation of AgNP was monitored by UV-visible spectroscopy at different time intervals. The shape and size of the synthesized particle were visualized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observations. These results were confirmed by X-ray powder diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) analyses and further supported by surface-enhanced Raman spectroscopy/Raman scattering (SERS) study. UV-visible spectrum has shown a sharp peak at 420 nm and further evidenced by FTIR peak profile (at 1587.6, 1386.4, and 1076 cm−1 with corresponding compounds). The main band position with SERS was noticed at 1594 cm−1 (C–C stretching vibration). When samples were heated under microwave radiation, AgNP with octahedron shapes with 5–50 nm were found and this method can be one of the easier ways to synthesis anisotropic AgNP, in which the plant extract plays a vital role to regulate the size and shape of the nanoparticles. Enhanced antibacterial effects (two- to fourfold) were observed in the case of Aloe vera plant protected AgNP than the routinely synthesized antibiotic drugs.Graphical AbstractShape and size-controlled synthesis of silver nanoparticles using Aloe vera plant extract Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-016-1725-x) contains supplementary material, which is available to authorized users.

“Smart” Antimicrobial Nanocomplexes with Potential to Decrease Surgical Site Infections (SSI)

“…This confirms the absence of bulky aggregates and a broad size distribution as reported in previous papers [74,75]. The reducing agents TCA and Cinn controlled the size distribution and size-directing properties of the Cinn bark extract is confirmed [75]. TCA and Cinn controlled the size distribution and size-directing properties of the Cinn bark extract is confirmed [75].…”

“…No other peaks of intensity are detected ( Figure 4). This confirms the absence of bulky aggregates and a broad size distribution as reported in previous papers [74,75]. The reducing agents TCA and Cinn controlled the size distribution and size-directing properties of the Cinn bark extract is confirmed [75].…”

“…Pure TCA and the Cinn bark extract were compared to investigate the effect of pharmacokinetic synergists in the natural plant extract Cinn with its manifold bioactive compounds [61,73]. Biogenic synthesis with plant extracts usually induce broad particle size distribution in most cases but can be also shapeand size determining [74,75]. We compared the particle size distribution of Cinn and TCA samples.…”

Fe-TiO2 Nanoparticles Synthesized by Green Chemistry for Potential Application in Waste Water Photocatalytic Treatment

“…In Table 1, appear the presumptive identi cation and relative quantity (%) of the components present in lemongrass solid sample analyzed by GC-MS operated in the full-scan mode of radio frequency. In order to guarantee the formation of TiO 2 nanoparticles with sizes of less than 20 nm, it is necessary that the extract of the lemongrass leaves has phytochemical components that act as surfactants and stabilizers that prevent excessive agglomeration of the nanoparticulate material formed during the synthesis [33,35,[41][42][43][44][45][46][47], as proposed in the mechanism shown in Figure 2. However, it is possible to synthesize TiO 2 powders through the complete hydrolysis of the used precursor (titanium isopropoxide) through the direct contact of the titanium source with water [45,48], with the disadvantage that it does not present alternatives to control the stages of nucleation and growth that are carried out in the process of production of nanoparticles in solution [49].…”

Synthesis and characterization of cotton fiber-based nanocellulose

“…For the past few decades, researchers have paid an attention to nanoscience and nanotechnology, because of its dynamic properties and applications [1][2][3][4]. Nanotechnology ("nanotech") deals the manipulation on an atom and molecular scale.…”