Phytosynthesis of stable Au, Ag and Au–Ag alloy nanoparticles using J. Sambac leaves extract, and their enhanced antimicrobial activity in presence of organic antimicrobials

IOP Conf. Ser.: Mater. Sci. Eng.

Rakhmania

et al. 2018

Abstract. Stabilized gold nanoparticles (AuNP) have been successfully prepared by a modification of ligand 2, 4, 6-trithiol-1, 3, 5-triazine (TT). TT has three thiol groups and nitrogen atoms on the aromatic ring that can interact and stabilize AuNP. TT modified AuNP (AuNP/TT) was characterized using UV-Vis spectrophotometer, particle size analyzer (PSA) and transmission electron microscopy (TEM). The characterization showed that AuNP/TT stable at a maximum wavelength (λmaks) of 537 nm with the particle diameter of 9.41 nm. The increased acidity (pH) causes the protonated thiol groups of TT marked with a visual change of colloidal AuNP/TT from purple to blue, causing AuNP and TT bonds weakened. In this study, the AuNP/TT was reacted with formalin. This interaction shows that AuNP/TT has a potential as an efficient detector of formalin, marked by changes in the diameter of the particle, colloidal color, and maximum wavelength shift.

Section: Synthesis Of Aunp With Various Concentration Of Nabh4mentioning

confidence: 99%

2, 4, 6-Trithiol-1, 3, 5-Triazine-Modified Gold Nanoparticles and Its Potential as Formalin Detector

IOP Conf. Ser.: Mater. Sci. Eng.

Rakhmania

et al. 2018

“…Visual observations shows that the synthesis of nanoparticles by various extracts concentration affect the color of nanoparticles. The produced AuNPs have a bright red color in a colloidal system with absorbance range of 510-550 nm [33][34][35]. Observations using UV-Vis spectrophotometer of the synthesized AuNPs were used to determine the optimum AuNPs formation through the change of wavelength and absorbance (Figure 2).…”

Section: Effect Of Various Asl Extract Concentration On Aunps Synthesismentioning

confidence: 99%

Green Synthesis of Gold Nanoparticles using Aqueous Garlic (Allium sativum L.) Extract, and Its Interaction Study with Melamine

Bull. Chem. React. Eng. Catal.

Abduracman

2017

Gold nanoparticles (AuNPs) have been successfully prepared by green synthesis method using aqueous extract of garlic with the Latin name of Allium sativum L. (ASL) as a reducing and stabilizing agents. Identification of active compounds in aqueous ASL extract was conducted by phytochemical analysis and Fourier transform infrared (FTIR) spectroscopy, while the synthesized AuNPs were characterized using UV-Vis spectrophotometer and transmission electron microscopy-selected area electron diffraction (TEM-SAED). The AuNPs formation was optimized at aqueous ASL extract concentration of 0.05%, HAuCl4 concentration of 2.0×10 -4 M, and pH of 3.6. The optimized AuNPs was characterized using TEM, and has a spherical shape with particle size of 15±3 nm. The particles were also stable up until one month. The synthesized AuNPs has been studied its interaction with melamine, and showed the optimum pH of interaction at 3.6.

“…The proposed materials are types of microorganisms, enzymes, plants, or plant extracts [1]. The reported biological resources can be used as a reducing and stabilizing agent in the synthesis of metal nanoparticles [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…Several studies of green synthesis have used the extracts of J. sambac leaf [5], Rosa rugosa leaf [9], Magnolia kobus and Diospyros kaki leaves [10], Ocimum sanctum leaf [11], Aerva lanata leaf [12], Coriandrum sativum leaf [13], Phyllanthus [14], and henna leaf [15] as reducing agents in AuNPs synthesis. On the other hand, Indonesia has abundant natural resources, including a biological diversity [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Green Method for Synthesis of Gold Nanoparticles Using Polyscias scutellaria Leaf Extract under UV Light and Their Catalytic Activity to Reduce Methylene Blue

Utari

Journal of Nanomaterials

et al. 2017

The aqueous fraction of Polyscias scutellaria leaf extract (PSE) has been used as a reducing agent and stabilizer in the green synthesis of gold nanoparticles (AuNPs). UV-Vis spectrophotometry, particle size analyzer (PSA), Fourier transform infrared (FTIR) spectroscopy, transmission electron microscopy-selected area electron diffraction (TEM-SAED), and X-ray diffraction (XRD) were used to characterize AuNPs. The AuNPs have a size of 5-20 nm and have a face centered cubic (fcc) crystal structure and are stable for 21 days. Phenolic compounds, which are secondary metabolites of PSE, act as an active compound to reduce Au 3+ion to Au 0 , as well as stabilize the AuNPs through their surface interaction with carbonyl and hydroxyl groups of phenols. AuNPs exhibit excellent catalytic activity for the reduction of methylene blue with NaBH 4 . The reduction of methylene blue using AuNPs catalysts is a pseudo-first-order reaction with a reduction rate constant ( obs ) of 0.0223 min −1 .