Water-dispersible tryptophan-protected gold nanoparticles prepared by the spontaneous reduction of aqueous chloroaurate ions by the amino acid

Selvakannan, P. R.; Mandal, Saikat; Phadtare, Sangita; Gole, Anand; Pasricha, Renu; Adyanthaya, Suguna; Sastry, Murali

doi:10.1016/s0021-9797(03)00616-7

Cited by 282 publications

(217 citation statements)

References 26 publications

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“…This is the first step required for controlled particle nucleation and growth and similar surface-enrichment processes close to peptide moieties have been described for histidine, methionine, cysteine, tryptophan, and arginine-rich peptides. 2,15,16,28,42 Once nucleation has occurred and the silver colloids start forming, the outcome of the mineralization process is largely governed by the concentration of the thioether moieties on the peptide fiber surface, because the main interaction between the peptides and the growing silver particles occurs via bonding of the thioether (thiol), amide, and benzyl groups of the peptide, as evidenced by XPS and SERS.…”

Section: Discussion Particle Formationmentioning

confidence: 99%

Silver nanoparticle engineering via oligovaline organogels

et al. 2008

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L-Valine-based oligopeptides with the chemical structure Z-(L-Val) 3 -OMe and Z-(L-Val) 2 -L-Cys (S-Bzl)-OMe form stable organogels in butanol. Both peptides are efficient gelators, but Z-(L-Val) 2 -L-Cys(S-Bzl)-OMe crystallizes more readily than Z-(L-Val) 3 -OMe. The two peptides can form mixed fibers, which also gel butanol. The resulting organogels are very similar to oligovaline organogels reported earlier (Mantion and Taubert, Macromol. Biosci., 2007, 7, 208) as they also form highly ordered peptide fibers with a predominant b-sheet structure and diameters of ca. 100 nm. The fibers can be mineralized with silver nanoparticles using DMF as a reducing agent. The fraction of the sulfurcontaining peptide Z-(L-Val) 2 -L-Cys(S-Bzl)-OMe controls the shape and size of the resulting nanoparticles. At high Z-(L-Val) 2 -L-Cys(S-Bzl)-OMe content, small spherical particles are distributed all over the fiber. Lower contents of Z-(L-Val) 2 -L-Cys(S-Bzl)-OMe lead to a size increase of the particles and to more complex shapes like plate-like and raspberry-like silver particles. The interactions between peptide and silver ions or silver particles takes place via a complexation of the silver ions to the sulfur atom of the thioether moiety, and are shown to be the key interaction in controlling particle formation.

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Section: Discussion Particle Formationmentioning

confidence: 99%

Silver nanoparticle engineering via oligovaline organogels

et al. 2008

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“…arise from a carbonyl stretching vibration and phenolic groups of tyrosine and tryptophan, respectively, which shows the carbonyl stretching vibration from the carboxylate ions and the hydroxyl stretching vibration from the phenolic ions in Tyr of the native fungus [30,31]. This indicated that the secondary structure of the proteins is affected as a consequence of reaction with the Au ions or binding with the gold nanoparticles.…”

Section: Fourier Transform Infrared Spectroscopymentioning

confidence: 97%

Enzymatic Formation of Gold Nanoparticles Using <i>Phanerochaete Chrysosporium</i>

Sanghi¹,

Verma²,

Puri³

2011

ACES

143

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When fungus Phanerochaete chrysosporium was challenged with gold ions under ambient aqueous conditions gold nanoparticles were formed within 90 minutes. Controlling experimental conditions like the age of fungus, incubation temperature and different concentration of gold chloride solution had drastic effect on the morphology of the nanoparticles formed. The enzyme assays indicated the role of enzyme as a reducing and shape directing agent. Laccase was the dominating enzyme in the case of fungal media for the synthesis of extracellular gold nanoparticles. Ligninase was responsible for the intracellular formation of nanoparticles on the fungal mycelium. The stabilization of the nanoparticles (NPs) via protein layer was evident by Atomic Force Microscopy (AFM) which revealed the nanoparticles to be spherical in the range of 10 -100 nm. This study represents an important advancement in the use of fungal enzymes for the biosynthesis of highly stable gold nanoparticles by a green and mild technique in one pot in aqueous media.

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“…Although the linkage of sulphur-bearing groups to GNPs and also linking different ligands to them are very appealing, practical and useful [11][12][13][14][15], the amine groups binding to GNPs can be considered in the same level. In fact, the linkage of GNPs to alkyl amine can facilitate the transfer of GNPs to organic solvents [16], and also the strong linkage of amino groups in amino acids and proteins to GNPs surface are related to the medical application of these hybrid materials [17,18].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of capped gold nanoparticles by using various amino acids

Zare

Khoshnevisan

Barkhi

et al. 2013

Journal of Experimental Nanoscience

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The production of gold nanoparticles (GNPs) by amino acid is one of the most attractive and interesting subjects in nanobiotechnology. In this study, amino acids have been utilised as a reducing agent and also an agent for capping GNPs. The GNPs were prepared using a reduction solution containing gold cations with optimum concentration of gold salt (5 mM), and also functionalised by glutamic acid, phenylalanine and tryptophan with optimum concentration of amino acids (25 mM). The optimum condition of gold solution and amino acids were achieved by ultraviolet-visible spectroscopy. The size of nanoparticles was obtained 5-20, 10-20 and 20-30 nm, respectively, by transmission electron microscopy and dynamic light scattering techniques. The results obtained from experimental and quantum calculations confirm that amino acids have strong bond while they have anion binding. Moreover, the free carboxylic groups of capped GNPs are one of the suitable and capable beads for binding biological agents. As a result, the medical applications of amino acids and proteins can be used as a practical method due to the strong interaction of peripheral amine groups with nanoparticles.

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Water-dispersible tryptophan-protected gold nanoparticles prepared by the spontaneous reduction of aqueous chloroaurate ions by the amino acid

Cited by 282 publications

References 26 publications

Silver nanoparticle engineering via oligovaline organogels

Silver nanoparticle engineering via oligovaline organogels

Enzymatic Formation of Gold Nanoparticles Using <i>Phanerochaete Chrysosporium</i>

Fabrication of capped gold nanoparticles by using various amino acids

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Water-dispersible tryptophan-protected gold nanoparticles prepared by the spontaneous reduction of aqueous chloroaurate ions by the amino acid

Cited by 282 publications

References 26 publications

Silver nanoparticle engineering via oligovaline organogels

Silver nanoparticle engineering via oligovaline organogels

Enzymatic Formation of Gold Nanoparticles Using &lt;i&gt;Phanerochaete Chrysosporium&lt;/i&gt;

Fabrication of capped gold nanoparticles by using various amino acids

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Enzymatic Formation of Gold Nanoparticles Using <i>Phanerochaete Chrysosporium</i>