Tryptophan‐Based Peptides to Synthesize Gold and Silver Nanoparticles: A Mechanistic and Kinetic Study

Si, Satyabrata; Mandal, Tarun K.

doi:10.1002/chem.200601492

Cited by 271 publications

(190 citation statements)

References 41 publications

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“…11,17 The present study also reports on the interactions of the peptides with the silver surface. Based on the current data, the following model can be derived.…”

Section: Discussion Particle Formationmentioning

confidence: 82%

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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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“…11,17 The present study also reports on the interactions of the peptides with the silver surface. Based on the current data, the following model can be derived.…”

Section: Discussion Particle Formationmentioning

confidence: 82%

“…They were either in solution or incorporated into gels. [11][12][13]17 Histidine-rich peptides have also been used as scaffolds, but there, an additional reducing agent, sodium borohydride, was used.…”

Section: Discussion Particle Formationmentioning

confidence: 99%

Silver nanoparticle engineering via oligovaline organogels

et al. 2008

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“…Glutathione ( -Glu-Cys-Gly) as a reducing/capping agent can synthesize water-soluble and size tunable silver nanoparticles which easily bind to a model protein (bovine serum albumin) (Wu et al 2008). Tryptophan residues of synthetic oligo-peptides at the C-terminus were identified as reducing agents producing silver nanoparticles (Si and Mandal 2007). Moreover, silver nanoparticles were synthesized by vitamin E in Langmuir-Blodgett technique, by bio-surfactants (sophorolipids) and by L-valine-based oligopeptides with chemical structures, Z-(L-Val) 3 -OMe and Z-(L-Val) 2 -L-Cys (S-Bzl)-OMe (Kasture et al 2007;Mantion et al 2008).…”

Section: Synthesis Of Silver Nanoparticles By Plantsmentioning

confidence: 99%

Silver Nanoparticles

Korbekandi¹,

Iravani²

2012

The Delivery of Nanoparticles

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“…With respect to nanomaterials, gold nanocrystals draw particular attention because of their ease of synthesis and interesting optical absorption cross-section. [1][2][3][4][5][6] Understanding of the gold-thiol binding chemistry has a proven track record in biological applications of various types of gold nanomaterials, which include nanospheres, -rods, -cages, and -shells. [1,2,[7][8][9][10] The importance of gold nanocrystals is due to their tunable optical properties, which in fact themselves depend on the shape, size, surface functionalization, and surrounding medium.…”

Section: Introductionmentioning

confidence: 99%

Short Gold Nanorod Growth Revisited: The Critical Role of the Bromide Counterion

Leduc

Delville

et al. 2011

ChemPhysChem

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A one-step, surfactant-assisted, seed-mediated method has been utilized for the growth of short gold nanorods with reasonable yield by modifying an established synthesis protocol. Among the various parameters that influence nanorod growth, the impact of the bromide counterion has been closely scrutinized. During this study it has been shown that, irrespective of its origin, the bromide counterion [cetyltrimethylammonium bromide (CTAB) or NaBr] plays a crucial role in the formation of nanorods in the sense that there is a critical [Br(-)]/[Au(3+)] ratio (around 200) to achieve nanorods with a maximum aspect ratio. Beyond this value, bromide can be considered as a poisoning agent unless shorter nanorods are required. The use of AgNO(3) helps in symmetry breaking for gold nanorod growth, whereas the bromide counterion controls the growth kinetics by selective adsorption on the facets of the growth direction. Thus, a proper balance between bromide ions and gold cations is also one of the necessary parameters for controlling the size of the gold nanorods; this has been discussed thoroughly. The results have been discussed based on their absorption spectra and finally shape evolution has been confirmed by TEM. Due to their efficient absorption in the near-IR region, these short nanorods were used in photothermal imaging of living COS-7 cells with improved signal-to-background ratios.

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Tryptophan‐Based Peptides to Synthesize Gold and Silver Nanoparticles: A Mechanistic and Kinetic Study

Cited by 271 publications

References 41 publications

Silver nanoparticle engineering via oligovaline organogels

Silver nanoparticle engineering via oligovaline organogels

Silver Nanoparticles

Short Gold Nanorod Growth Revisited: The Critical Role of the Bromide Counterion

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