Synthesis and pH-dependent assembly of isotropic and anisotropic gold nanoparticles functionalized with hydroxyl-bearing amino acids

Swami, Anuradha; Mittal, Sherry; Chopra, Adity; Sharma, Rohit K.; Wangoo, Nishima

doi:10.1007/s13204-018-0714-z

Cited by 8 publications

(2 citation statements)

References 29 publications

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“…The UV-Visible spectra showed that Ab-AuNPs have surface plasmon resonance (SPR) bands around 574 nm. These findings are in agreement with Swami et al (21) in which the UV-Visible spectra of AuNPs within the apparent absorbance band area was 500 nm-600 nm.…”

Section: Discussionsupporting

confidence: 93%

Antimicrobial and Antibiofilm Activity of Gold Nanoparticles Biosynthesized Using Acinetobacter Baumannii Isolated from Wounds and Burns

Al-Abdeli¹,

Al-Kalifawi²

2023

The Egyptian Journal of Hospital Medicine

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Background: Due to their biological and physiochemical characteristics, metal-based nanoparticles show promise as antimicrobials and therapeutic agents. Aim: This study aimed to biosynthesize AuNPs from A. baumannii broth and test their antibacterial and ant-virulence properties. Materials and methods: UV-vis, FTIR, XRD, TEM, FESEM and AMF were used to analyze biosynthesized gold nanoparticles. The well method diffusion assay was utilized to determine Ab-AuNPs' antibacterial activity against five bacterial strains. Microtiter plate was used to study the effect of Ab-AuNPs on biofilm formation in five bacterial isolates.

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Section: Discussionsupporting

confidence: 93%

Antimicrobial and Antibiofilm Activity of Gold Nanoparticles Biosynthesized Using Acinetobacter Baumannii Isolated from Wounds and Burns

Al-Abdeli¹,

Al-Kalifawi²

2023

The Egyptian Journal of Hospital Medicine

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“…The bio-reduction reaction requires the bio-capping agents to control the NP size and morphology, which may embed on nonspecifically open surfaces of AuNPs and cause the anisotropic morphological formation. Swami et al (2018) have previously delineated the projected function of hydroxyl ions toward attaining the anisotropic morphology of AuNPs synthesized using hydroxyl-moiety-bearing amino acids. Thus, it was hypothesized that multiple-shaped AuNPs could be substantiated upon being subjected to varying pH, spanning from 3 to 10.…”

Section: Morphological Studiesmentioning

confidence: 99%

Biosynthesis of Gold Nanoisotrops Using Carallia brachiata Leaf Extract and Their Catalytic Application in the Reduction of 4-Nitrophenol

et al. 2022

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The past decade has observed a significant surge in efforts to discover biological systems for the fabrication of metal nanoparticles. Among these methods, plant-mediated synthesis has garnered sizeable attention due to its rapid, cost-effective, environmentally benign single-step procedure. This study explores a step-wise, room-temperature protocol for the synthesis of gold nanoparticles (AuNPs) using Carallia brachiata, a mangrove species from the west coast of Peninsular Malaysia. The effects of various reaction parameters, such as incubation time, metal ion concentration, amount of extract and pH, on the formation of stable colloids were monitored using UV-visible (UV-Vis) absorption spectrophotometry. Our findings revealed that the physicochemical properties of the AuNPs were significantly dependent on the pH. Changing the pH of the plant extract from acidic to basic appears to have resulted in a blue-shift in the main characteristic feature of the surface plasmon resonance (SPR) band, from 535 to 511 nm. The high-resolution-transmission electron microscopy (HR-TEM) and field emission scanning electron microscopy (FESEM) images revealed the morphologies of the AuNPs synthesized at the inherent pH, varying from isodiametric spheres to exotic polygons and prisms, with sizes ranging from 10 to 120 nm. Contrarily, an optimum pH of 10 generated primarily spherical-shaped AuNPs with narrower size distribution (8–13 nm). The X-ray diffraction (XRD) analysis verified the formation of AuNPs as the diffraction patterns matched well with the standard value of a face-centered cubic (FCC) Au lattice structure. The Fourier-transform infrared (FTIR) spectra suggested that different functional groups are involved in the biosynthetic process, while the phytochemical test revealed a clear role of the phenolic compounds. The reduction of 4-nitrophenol (4-NP) was selected as the model reaction for evaluating the catalytic performance of the green-synthesized AuNPs. The catalytic activity of the small, isotropic AuNPs prepared using basic aqueous extract was more effective than the nanoanisotrops, with more than 90% of 4-NP conversion achieved in under an hour with just 3 mg of the nanocatalyst.

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Anisotropic gold nanoparticles: A survey of recent synthetic methodologies

Ortiz-Castillo

Gallo‐Villanueva

Madou³

et al. 2020

Coordination Chemistry Reviews

103

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Synthesis and pH-dependent assembly of isotropic and anisotropic gold nanoparticles functionalized with hydroxyl-bearing amino acids

Cited by 8 publications

References 29 publications

Antimicrobial and Antibiofilm Activity of Gold Nanoparticles Biosynthesized Using Acinetobacter Baumannii Isolated from Wounds and Burns

Antimicrobial and Antibiofilm Activity of Gold Nanoparticles Biosynthesized Using Acinetobacter Baumannii Isolated from Wounds and Burns

Biosynthesis of Gold Nanoisotrops Using Carallia brachiata Leaf Extract and Their Catalytic Application in the Reduction of 4-Nitrophenol

Anisotropic gold nanoparticles: A survey of recent synthetic methodologies

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