Retracted Article: Organometallic Ag nanostructures prepared using Hypericum perforatum extract are highly effective against multidrug-resistant bacteria

Abstract

The tuning of bulk Ag+ ions into organometallic Ag nanostructures using Hypericum perforatum extract is reported for the first time. The green-synthesised nanostructures showed an auspicious antibacterial performance against highly virulent multidrug resistant bacteria.

Green synthesis and chemical characterization of silver nanoparticles obtained using Allium saralicum aqueous extract and survey of in vitro antioxidant, cytotoxic, antibacterial and antifungal properties

“…The contamination created by biosynthesis of nanoparticles by plant extracts is less than that of other methods and is approximately zero. Therefore, the biosynthesis of nanoparticles by plant extracts has fewer environmental concerns and is more environmentally friendly . However, the production speed, quality and other characteristics of the nanoparticles produced by plant extracts depend on factors such as the nature of the plant extract, concentration of extract, salt concentration, pH, temperature and duration of the reaction .…”

“…Therefore, the biosynthesis of nanoparticles by plant extracts has fewer environmental concerns and is more environmentally friendly . However, the production speed, quality and other characteristics of the nanoparticles produced by plant extracts depend on factors such as the nature of the plant extract, concentration of extract, salt concentration, pH, temperature and duration of the reaction . Previous studies indicated that metal nanoparticles of plant extracts have strong potentials in treatment of microbial diseases .…”

“…However, the production speed, quality and other characteristics of the nanoparticles produced by plant extracts depend on factors such as the nature of the plant extract, concentration of extract, salt concentration, pH, temperature and duration of the reaction . Previous studies indicated that metal nanoparticles of plant extracts have strong potentials in treatment of microbial diseases . Examples of medicinal plants used for synthesizing silver nanoparticles (AgNPs) include Abutilon indicum , Acalypha indica , Acorus calamus , Aloe vera , Alternanthera dentate , Argyreia nervosa , Boerhaavia diffusa , Brassica rapa , Calotropis procera , Carica papaya , Centella asiatica , Citrus sinensis , Coccinia indica , Cocous nucifera , Cymbopogan citratus , Datura metel , Eclipta prostrate , Eucalyptus hybrid , Ficus carica , Garcinia mangostana , Melia dubia , Memecylon edule , Moringa oleifera , Musa paradisiacal , Nelumbo nucifera , Pistacia atlantica , Pogostemon benghalensis , Portulaca oleracea , Premna herbacea , Psoralea corylifolia , Swietenia mahogany , Thevetia peruviana , Trachyspermum ammi , Tribulus terrestris , Vitex negundo , Vitis vinifera and Ziziphora tenuior…”

<em>Hypericum perforatum</em> Extract Mediated Green Synthesis of Ultra-Small Fe₂O₃ Nanostructures

“…The core idea behind the functionality of OMNS is the smart interaction of low molecular weight organic units with metals at nanoscale. These kind of interactions make OMNS more efficient in activity mainly because of tailored physicochemical properties [1][2][3]. For example, Ag OMNS of less than 40 nm size recently synthesized in our lab using Hypericum perforatum extract showed extraordinary performance against multidrug resistant bacteria in comparison to classical MNS and fourth generation antibiotics [1].…”

“…These kind of interactions make OMNS more efficient in activity mainly because of tailored physicochemical properties [1][2][3]. For example, Ag OMNS of less than 40 nm size recently synthesized in our lab using Hypericum perforatum extract showed extraordinary performance against multidrug resistant bacteria in comparison to classical MNS and fourth generation antibiotics [1]. The interaction of flavonoids, namely quercetin and its derivatives as surface stabilizing agents have created the Ag nanospheres with high antimicrobial potential [1].…”