Peptide-functionalized iron oxide magnetic nanoparticle for gold mining

Abstract

Here, we present our work on preparing a novel nanomaterial composed of inorganic binding peptides and magnetic nanoparticles for inorganic mining. Two previously selected and well-characterized gold-binding peptides from cell surface display, AuBP1 and AuBP2, were exploited. This nanomaterial (AuBP-MNP) was designed to fulfill the following two significant functions: the surface conjugated gold-binding peptide will recognize and selectively bind to gold, while the magnetic nano-sized core will respond and migrate according to the applied external magnetic field. This will allow the smart nanomaterial to mine an individual material (gold) from a pool of mixture, without excessive solvent extraction, filtration, and concentration steps. The working efficiency of AuBP-MNP was determined by showing a dramatic reduction of gold nanoparticle colloid concentration, monitored by spectroscopy. The binding kinetics of AuBP-MNP onto the gold surface was determined using surface plasmon resonance (SPR) spectroscopy, which exhibits around 100 times higher binding kinetics than peptides alone. The binding capacity of AuBP-MNP was demonstrated by a bench-top mining test with gold microparticles. Graphical abstract Electronic supplementary materialThe online version of this article (doi:10.1007/s11051-017-3752-7) contains supplementary material, which is available to authorized users.

Biomining of MoS2 with Peptide-based Smart Biomaterials

“…Following the selective recognition of metal by the peptides, a carrier system should facilitate the separation of metal from the slurry such as induced flocculation or aggregation by the help of bacteriophage particles displaying the peptides 8 , 10 . Alternatively, peptides can be decorated on the surface of a magnetic nanoparticle and could be separated by using external magnetic field 11 . In this study, we applied the latter approach and prepared MoS2-P15 functionalized magnetic nanoclusters (Fig.…”

“…Recently, we have generated an alternative biomining approach based on the utilization of peptide-functionalized magnetic nanoparticles 11 . Therein, the biomining of gold colloids was demonstrated without the need for excessive downstream solvent extraction, filtration, and concentration steps.…”

Core-Shell Magnetic Nanoparticles for Highly Sensitive Magnetoelastic Immunosensor

“…Since the component of the magnetic induction field along the y axis is negligible, the magnetic moment of a core-shell NP lies on the x-z plane. The order of magnitude of the magnetic moment can be retrieved by the hysteresis cycles of Fe 3 O 4 superparamagnetic nanoparticles provided by the seller and reported in Supplementary Materials Figure S1 , also considering the effect of the gold shell that weakens magnetic properties [ 46 ]. The intensity of external magnetic induction field was high enough to induce significant magnetization, but only in the linear range of the magnetic response so the magnetic susceptibility could be considered constant in our case.…”

Carbon Dots/Iron Oxide Nanoparticles With Tuneable Composition and Properties

“…To that end, surfactants and macromolecules are physically adsorbed or chemically attached to Fe-NPs, while passivating layers based on precious metals, silica and carbon can accommodate various functional groups, facilitating further conjugation with ligands, biomolecules and nanostructures. An expanding body of literature focuses on Fe-NPs combined with peptides [12], DNA [13], aptamers [14], lipids [15], drug molecules [16], biopolymers [17], dendrimers [18], rare earth elements [19], metal organic frameworks [20], graphene oxide [21], carbon nanotubes [22] and fullerenes [23].…”