Biogenic synthesis of silver nanoparticles via indigenous Anigozanthos manglesii, (red and green kangaroo paw) leaf extract and its potential antibacterial activity

Abstract

INTRODUCTIONOver the last decade research in nanotechnology and biological sciences has converged to create the new field of nano-biotechnology. This new multi-disciplined research field combines the principles of green chemistry, biology and nanotechnology to deliver sustainable, ecofriendly and state-of-the-art solutions for a wide range of biomedical, environmental remediation and optoelectronic applications. [1][2][3][4][5][6][7][8] Much of the research in this field has focused on synthesising metal nanoparticles. Since metals, typically gold (Au) and silver (Ag), at the nanometre scale have unique and distinctive physiochemical properties that are directly related to their size, size distribution and morphology. 9Conventional physical and chemical methods of producing metal nanoparticles have a number of inherent limitations such as cytotoxicity, carcinogenicity and environmental toxicity that result from the use of toxic chemicals and solvents during manufacture. 10,11 Understandably, because of toxicity concerns research has focused on developing alternative manufacturing protocols that are clean, non-toxic, and eco-friendly to implement.However, developing effective eco-friendly methods for producing nanoparticles with a specific size, shape, ABSTRACT Background: Metallic silver nanoparticles with antibacterial properties were biosynthesised for the first time using an indigenous Australian plant Anigozanthos manglesii. Methods: A practical, straight-forward and eco-friendly technique used the Anigozanthos manglesii leaf extract, which acted as both reducing and capping agents to create stable silver nanoparticles. The antibacterial activities of the nanoparticles were investigated using the Kirby-Bauer sensitivity method. Results: Characterisation revealed the nanoparticles ranged in size from 50 nm up to 150 nm, and their morphologies included cubes, triangular plates and hexagonal plates. Antibacterial studies revealed Deinococcus was sensitive and susceptible to the biosynthesised nanoparticles. Escherichia coli and Staphylococcus Epidermis strains were also found to be less susceptible to the silver nanoparticles. Conclusions:The present study has shown that silver nanoparticles biosynthesised using Anigozanthos manglesii leaf extracts have antibacterial activity against Deinococcus, Escherichia coli and Staphylococcus Epidermis bacterial strains

Production of High-Value Nanoparticles via Biogenic Processes Using Aquacultural and Horticultural Food Waste

“…For example, gold (Au) nanoparticles are already widely used in medicine for diagnostics [ 54 , 55 , 56 ], targeted delivery of pharmaceuticals [ 57 , 58 , 59 , 60 ] and tumour destruction via hyperthermia [ 61 ]. While silver (Ag) nanoparticles display a broad spectrum antimicrobial activity against many human and animal pathogens [ 62 , 63 , 64 , 65 ] and as a result are used as antimicrobial agents in a wide range of commercially available medical and consumer products [ 66 , 67 , 68 ], both platinum (Pt) and palladium (Pd) nanoparticles have been used as catalysts [ 69 , 70 , 71 ]. Furthermore, metal oxide nanoparticles such as copper oxide (Cu 2 O, CuO) and zinc oxide (ZnO) have displayed antimicrobial activity [ 72 , 73 ] and because of this ZnO has been used in a variety of food packaging applications [ 74 ].…”

Green Synthesis, Characterization & Antibacterial Studies of Silver (Ag) and Zinc Oxide (Zno) Nanoparticles

“…The medicinal plant extract are act as dual role like reducing and capping agent 36 . FTIR spectra of Anigozanthos manglesii green synthesized Ag NPs with broad absorption band at 3448cm -1 and hydroxyl (-OH) group present in the biomacromolecules on leaf extract 37 . FTIR spectra of biosynthesis Ag NPs vibration frequency observed at 1381cm -1 and corresponding to -NO 3 stretching whereas the peak at 692cm -1 responsible for the reduction and capping during the synthesis of Ag NPs 36,38 .…”

Biocontrol of mosquito vectors through herbal-derived silver nanoparticles: prospects and challenges

“…Silver nanoparticles have been synthesized using Annona reticulata Linnaeus (Parthiban et al 2019), Chasmanthera dependens Hochst (Aina et al 2019), Ceropegia bulbosa Roxburgh (Vetrivel et al 2019), Piper longum Linnaeus (Yadav et al 2019), Cullen corylifolium Linnaeus (Saini et al 2019), Curcuma zedoaria Roscoe (Sutthanont et al 2019), Naringi crenulata Roxburgh (Pratheeba et al 2019), and Avicennia marina Forsskål (Barnawi et al 2019); they exhibit tremendous larvicidal potential against various mosquito vectors. Herbal silver nanoparticles have several advantages over the chemically synthesized silver nanoparticles like eco-friendly, cost-effective, single-step synthesis, and an easy control of crystal growth, and also, they are non-toxic and safe to handle (Iravani 2011; Salam et al 2012;Shah et al 2016;Benelli 2016a;Das et al 2017;Murugan et al 2017). Furthermore, herbal silver nanoparticles do not have any side effect against nontargeted organisms over the conventional chemical insecticides (Duan et al 2015;Benelli 2016a;Kumar et al 2018a, b;Saini et al 2019;Yadav et al 2019).…”