Studies on l -histidine capped Ag and Au nanoparticles for dopamine detection

Economical synthesis of silver nanoparticles using leaf extract of Acalypha hispida and its application in the detection of Mn(II) ions

“…Recently, the studies on AgNPs have extended to the detection of ions including Cu 2+ , Hg 2+ , Cr 6+ [11] , [12] and chemicals such as dopamine was also detected using the impregnated AgNPs [13] . Therefore, this study includes the application of AgNPs in the detection of Mn(II) ions.…”

A Novel Copper-Binding Peptide That Self-Assembles Into a Transparent Antibacterial and Antiviral Coating

“…The shift and narrowing of this peak at the spectra of the PC-and PCN-coated plates could point to interactions between the imidazole ring of the histidine residues and the Cu. Additionally, the peak at 1,126 cm −1 in the spectrum of the PCN-coated plate could be associated with the stretching vibration of the CN group in the imidazole ( Nivedhini Iswarya et al, 2017 ). These data support the existence of the peptide’s interactions with Cu ions or with metallic Cu through the histidine residues.…”

Taking Advantage of the Morpheein Behavior of Peroxiredoxin in Bionanotechnology

“…The inborn affinity of amino acids toward metals 4 , 8 and the possibility to insert polyHis sequences to further expand this affinity allow Prx to bind metals and build hybrid Prx-metal nanostructures. 9 , 83 , 96 For instance, imidazole-mediated binding of Ni 2+ -coated 1.8 nm AuNPs to N-terminal polyHis-tagged Sm PrxI rings can be achieved at pH 7.6. The nanoparticles are partially trapped within the ring scaffolds thus giving to the hybrid Sm PrxI-AuNPs complexes electrical responsiveness if exposed to a 6 V bias voltage, as demonstrated by repulsive-mode electrostatic force microscopy (EFM) performed in air on samples adsorbed on silicon dioxide substrates ( Figure 8 a).…”

“…Notably, the arrays exhibit Raman scattering enabling detection of the amino acids and alkyne molecules, the latter being distinguishable for their C≡C bonds in a biomolecule-silent spectral region ( Figure 10 b). 84 Alike the Sm PrxI-GO hybrid composites where the patterned ring shape drives stacking of GO (see section 3.2.3 ), the 1D assembly of AuNPs is likely to occur due to the geometrical protein complex and the interaction with the polyHis-tagged identical bottom and top surfaces; 9 , 96 moreover, even the native amino acids, including methionine and cysteine, at the Sm PrxI ring surface would play a role in the assembly process for being sensitive to changes of pH and ionic strength. 8 , 84 …”