Green synthesis of silver, gold and silver/gold bimetallic nanoparticles using the Gloriosa superba leaf extract and their antibacterial and antibiofilm activities

Nanoparticle (NP) catalysts are widely used for removal of dyes for single use, but there is an acute need for developing catalysts with high efficiency and reusability for mixed dyes. Here we first optimized the process (reactant proportion, temperature, time, and pH) for biosynthesis of monometallic Ag, Au and bimetallic Au-Ag alloy NP catalysts using Polyalthia longifolia leaf extract. The biosynthesized NP catalysts were characterized by UV-vis, DLS, Zeta potential, TEM and EDX study while the probable biomolecules responsible for biosynthesis were identified by FTIR and GC-MS/MS analysis. The NPs are found to be mostly spherical in shape (size 5-20 nm) with prolonged stability. We evaluated their chemo-catalytic performance through degradation of dyes (methyl orange, methyl violet, methylene blue) in individual and ternary mixture in presence of NaBH 4. The degradation percentage (80.06-96.59% within 5 min), degradation kinetics (k = 0.361-1.518 min-1), half-life (T 50 = 0.457-1.920 min) and 80% degradation (T 80 = 1.060-4.458 min) of dyes indicated highest catalytic activity of alloy in ternary mixture. Here we report a unique vacuum filtration system using alloy coated beads with excellent catalytic activity which could be reused thrice for removal of hazardous ternary mixed dyes with great promise for environmental remediation.

show abstract

“…1). Similar observation has also been reportedearlier 19,31 . Energy dispersive X-ray Spectroscopy (EDX) spectrum of biosynthesized AgNPs ( Fig.…”

Section: Resultssupporting

confidence: 90%

Process optimization for biosynthesis of mono and bimetallic alloy nanoparticle catalysts for degradation of dyes in individual and ternary mixture

Ghosh

Roy

Naskar

et al. 2020

Sci Rep

View full text Add to dashboard Cite

show abstract

“…In the synthesis study with plant‐derived Terminalia arjuna extract, the CN group was found to be among those involved in the reduction. [ 11 ] In a study conducted with Cystoseira baccata extract, indicated that the OH group may be responsible for the reduction. [ 12 ] In another study, it is mentioned that these functional groups are involved in reduction.…”

Section: Resultsmentioning

confidence: 99%

“…[ 18 ] In the other two biological synthesis studies, the same formula was used and the crystal particle size was calculated as 23.7 and 18 nm, respectively. [ 5,11,19 ]…”

Section: Resultsmentioning

confidence: 99%

Determination of Antimicrobial and Toxic Metal Removal Activities of Plant‐Based Synthesized (Capsicum annuumL. Leaves), Ecofriendly, Gold Nanomaterials

2020

View full text Add to dashboard Cite

Nanoparticles are valuable materials with widespread use. The fact that these materials are obtained by biological resources with an environmentally friendly method contributes to the development of studies in this field. Gold nanoparticles (AuNPs) from waste vegetable sources (green leaves of Capsicum annum L.) are economically and easily synthesized. The obtained particles are characterized by UV–vis spectroscopy (UV–vis), Fourier transform infrared spectroscopy (FTIR), X‐ray diffraction (XRD), and scanning electron microscopy (SEM) analysis. The antimicrobial activity of the particles on the pathogenic microorganisms Escherichia coli ATCC 25922, Staphylococcus aureus ATCC 29213, Bacillus subtilis bacteria, and Candida albicans yeast are found to have a significant suppressive effect. The removal activities of eight toxic metals (Pd, Cd, Fe, Ni, Co, Mn, Zn, Pb) in Diyarbakır drinking water and artificially prepared water within different pHs are investigated. Gold nanoparticles synthesized from Capsicum annuum L. leaves are found to be effective in toxic metal removal in water samples.

show abstract

“…Antibiofilm property of β1-3 glucan-binding protein-based silver nanoparticles (Ppβ-GBP-AgNPs) was assessed, and related findings demonstrated that it inhibited 85% and 80% of immature biofilms by E. faecalis and P. aeruginosa, respectively (Anjugam, Vaseeharan et al, 2018 (Comin, Lopes et al, 2016). On the other hand, green synthesized Nps (silver and gold), bimetallic (Ag/Au) Nps, and lectin-coated AgNPs reduced the biofilm formation and interfered with cell adhesion and polysaccharide matrix (Gopinath, Kumaraguru et al, 2016, Jayanthi, Shanthi et al, 2017. According to the recent studies, Crataeva nurvala -AgNPs (CN-AgNPs) efficiently suppressed the production of QS-mediated virulence factors, such as pyocyanin, protease, hemolysin, and biofilm formation in P. aeruginosa (Ali, Ansari et al, 2017).…”

Section: S Epidermidis Vb_sepis-phiipla5 and Vbsepis Phiipla7mentioning

confidence: 99%

Advanced strategies for combating bacterial biofilms

Sharahi

Azimi

Shariati

et al. 2019

Journal Cellular Physiology

View full text Add to dashboard Cite

Biofilms are communities of microorganisms that are formed on and attached to living or nonliving surfaces and are surrounded by an extracellular polymeric material. Biofilm formation enjoys several advantages over the pathogens in the colonization process of medical devices and patients' organs. Unlike planktonic cells, biofilms have high intrinsic resistance to antibiotics and sanitizers, and overcoming them is a significant problematic challenge in the medical and food industries. There are no approved treatments to specifically target biofilms. Thus, it is required to study and present innovative and effective methods to combat a bacterial biofilm. In this review, several strategies have been discussed for combating bacterial biofilms to improve healthcare, food safety, and industrial process.

show abstract

Green synthesis of silver, gold and silver/gold bimetallic nanoparticles using the Gloriosa superba leaf extract and their antibacterial and antibiofilm activities

Cited by 192 publications

References 54 publications

Process optimization for biosynthesis of mono and bimetallic alloy nanoparticle catalysts for degradation of dyes in individual and ternary mixture

Process optimization for biosynthesis of mono and bimetallic alloy nanoparticle catalysts for degradation of dyes in individual and ternary mixture

Determination of Antimicrobial and Toxic Metal Removal Activities of Plant‐Based Synthesized (Capsicum annuumL. Leaves), Ecofriendly, Gold Nanomaterials

Advanced strategies for combating bacterial biofilms

Contact Info

Product

Resources

About