Synergetic Antibacterial Effects of Silver Nanoparticles@Aloe Vera Prepared via a Green Method

Abstract

Aloe Vera-conjugated Ag nanoparticles (AgNPs@AV hybrids) are synthesized in large quantities by reducing silver nitrate with Aloe Vera pulp extract at room temperature. TEM image reveals that these NPs are predominantly spherical with an average of 25 nm in diameter. The crystal structure of AgNPs@AV is determined by XRD. The cytotoxicity of AgNPs@AV hybrids is detected by carrying out the cell viability measurement on Human Dermal Fibroblasts (HDF) cells, the results show that no obvious cytotoxicity is observed. Compared with Vera gel and Ag NPs (washed from Vera gel) alone, AgNPs@AV hybrids possess more excellent antibacterial activity on E. coli even at very low concentration.

Biosynthesis of gold nanoparticles using chloroplasts

“…Biomaterials have been considered an attractive resource for green synthesis due to their diversity, regenerative ability, and safety. [1][2][3][4] Among various MNPs, gold nanoparticles (GNPs) have been extensively studied based on their unique optoelectronic and electrochemical properties. The unique properties of GNPs have been potentially of interest for biological applications including sensors, 5,6 catalysts, 7 optical probes, [8][9][10] tumor photothermal therapy, 11 biomedical engineering, 12 and surface-enhanced Raman scattering (SERS).…”

“…The authors hypothesize that the effective utilization of various phytochemicals that contain functional groups -such as tetraterpenoid, aldehyde, and carboxy -within the protein frameworks and in combination with the presence of saccharides coming from the photosynthesis of chloroplasts, will provide synergistic chemical reduction power for the reduction of gold salts into their corresponding nanoparticles. 4,2,24 Since chloroplasts are very similar in higher plants, the chloroplasts from Trifolium, a plant which is widespread throughout the authors' campus, were collected to synthesize GNPs. As far as the authors are aware, this paper is the first report of a simple, one-spot, cost-effective, and ecofriendly strategy for the biosynthesis of GNPs based on chloroplasts at room temperature.…”

Antimicrobial Effect of Coated Leather Based on Silver Nanoparticles and Nanocomposites: Synthesis, Characterisation and Microbiological Evaluation

“…The formation of colloidal silver nanoparticles using different reducing agents was evaluated by UV-Vis spectroscopy [20,[24][25][26]. Figures 1 and 2 show the UV-Vis spectra of the different silver nanoparticles synthesised at two different agitation rates and as a function of time.…”

“…Colloidal silver emulsions were synthesised from silver nitrate using three different reducing agents: sodium borohydride (Merck, Darmstadt, Germany), gelatine/glucose and an Aloe vera extract [20]. Gelatine and Aloe vera extract were used as natural reducing agents which are more environmentally-friendly than the traditional sodium borohydride.…”

“…( Finally, AgAV nanoparticles were synthesised by the Zhang method [20] using a glycolic Aloe vera extract (Guinama, Valencia, Spain) as a reducing/stabilising agent (equation 3). The evolution of the reaction was then followed by UV-Vis spectroscopy.…”