WO2005091704A2 - Nanopartículas magnéticas de metales nobles - Google Patents
Nanopartículas magnéticas de metales nobles Download PDFInfo
- Publication number
- WO2005091704A2 WO2005091704A2 PCT/ES2005/070035 ES2005070035W WO2005091704A2 WO 2005091704 A2 WO2005091704 A2 WO 2005091704A2 ES 2005070035 W ES2005070035 W ES 2005070035W WO 2005091704 A2 WO2005091704 A2 WO 2005091704A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- magnetic
- nanoparticles
- magnetic nanoparticles
- noble metals
- mass state
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K41/00—Medicinal preparations obtained by treating materials with wave energy or particle radiation ; Therapies using these preparations
- A61K41/0052—Thermotherapy; Hyperthermia; Magnetic induction; Induction heating therapy
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K49/00—Preparations for testing in vivo
- A61K49/06—Nuclear magnetic resonance [NMR] contrast preparations; Magnetic resonance imaging [MRI] contrast preparations
- A61K49/18—Nuclear magnetic resonance [NMR] contrast preparations; Magnetic resonance imaging [MRI] contrast preparations characterised by a special physical form, e.g. emulsions, microcapsules, liposomes
- A61K49/1818—Nuclear magnetic resonance [NMR] contrast preparations; Magnetic resonance imaging [MRI] contrast preparations characterised by a special physical form, e.g. emulsions, microcapsules, liposomes particles, e.g. uncoated or non-functionalised microparticles or nanoparticles
- A61K49/1821—Nuclear magnetic resonance [NMR] contrast preparations; Magnetic resonance imaging [MRI] contrast preparations characterised by a special physical form, e.g. emulsions, microcapsules, liposomes particles, e.g. uncoated or non-functionalised microparticles or nanoparticles coated or functionalised microparticles or nanoparticles
- A61K49/1824—Nuclear magnetic resonance [NMR] contrast preparations; Magnetic resonance imaging [MRI] contrast preparations characterised by a special physical form, e.g. emulsions, microcapsules, liposomes particles, e.g. uncoated or non-functionalised microparticles or nanoparticles coated or functionalised microparticles or nanoparticles coated or functionalised nanoparticles
- A61K49/1878—Nuclear magnetic resonance [NMR] contrast preparations; Magnetic resonance imaging [MRI] contrast preparations characterised by a special physical form, e.g. emulsions, microcapsules, liposomes particles, e.g. uncoated or non-functionalised microparticles or nanoparticles coated or functionalised microparticles or nanoparticles coated or functionalised nanoparticles the nanoparticle having a magnetically inert core and a (super)(para)magnetic coating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
- B22F1/054—Nanosized particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/16—Metallic particles coated with a non-metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/16—Making metallic powder or suspensions thereof using chemical processes
- B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
- B22F9/24—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y25/00—Nanomagnetism, e.g. magnetoimpedance, anisotropic magnetoresistance, giant magnetoresistance or tunneling magnetoresistance
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y5/00—Nanobiotechnology or nanomedicine, e.g. protein engineering or drug delivery
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
- G01N33/54366—Apparatus specially adapted for solid-phase testing
- G01N33/54373—Apparatus specially adapted for solid-phase testing involving physiochemical end-point determination, e.g. wave-guides, FETS, gratings
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
- G11B5/712—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the surface treatment or coating of magnetic particles
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
- G11B5/714—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by the dimension of the magnetic particles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/0036—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties showing low dimensional magnetism, i.e. spin rearrangements due to a restriction of dimensions, e.g. showing giant magnetoresistivity
- H01F1/0045—Zero dimensional, e.g. nanoparticles, soft nanoparticles for medical/biological use
- H01F1/0054—Coated nanoparticles, e.g. nanoparticles coated with organic surfactant
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S977/00—Nanotechnology
- Y10S977/70—Nanostructure
- Y10S977/773—Nanoparticle, i.e. structure having three dimensions of 100 nm or less
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S977/00—Nanotechnology
- Y10S977/70—Nanostructure
- Y10S977/81—Of specified metal or metal alloy composition
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S977/00—Nanotechnology
- Y10S977/70—Nanostructure
- Y10S977/832—Nanostructure having specified property, e.g. lattice-constant, thermal expansion coefficient
- Y10S977/838—Magnetic property of nanomaterial
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S977/00—Nanotechnology
- Y10S977/902—Specified use of nanostructure
- Y10S977/904—Specified use of nanostructure for medical, immunological, body treatment, or diagnosis
- Y10S977/925—Bioelectrical
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S977/00—Nanotechnology
- Y10S977/902—Specified use of nanostructure
- Y10S977/932—Specified use of nanostructure for electronic or optoelectronic application
- Y10S977/953—Detector using nanostructure
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S977/00—Nanotechnology
- Y10S977/902—Specified use of nanostructure
- Y10S977/932—Specified use of nanostructure for electronic or optoelectronic application
- Y10S977/953—Detector using nanostructure
- Y10S977/96—Of magnetic property
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
- Y10T428/2991—Coated
Definitions
- TECHNICAL SECTOR The object of the present invention is framed within the applications of nanotechnology. Magnets with very small dimensions ( ⁇ 5 nm) would be available in a range in which conventional magnetic metals behave as superparamagnetic (disappearance of the hysteresis cycle). Firstly, the reduction of the dimensions in the magnetic register can be proposed using the developed nanoparticles. Applications in biomedicine can also be proposed, such as tools for biomolecule recognition, nuclear magnetic resonance imaging, drug release control or hyperthermia treatments.
- the object of the present invention is made up of noble metal nanoparticles, with a controlled microstructure that leads to the appearance of magnetic behavior in them.
- An object of the present invention is also a process for preparing said nanoparticles.
- Au / Fe nanoparticles consisting of an iron core and a gold crust, functionalized with thiols or protected by surfactants have also been reported (B. Ravel, EE Carpenter, VG Harris, J. of Appl. Phys. 91 (2002) 8195).
- the magnetic behavior of the iron core gives rise to the appearance of superparamagnetism in these nanoparticles, and to the proposal of possible applications in biomedicine (WO03072830, EP1339075, WO03057175).
- gold nanoparticles functionalized with organic radicals have been reported that give the particles a magnetic behavior (EP1211698).
- the object of the present invention is magnetic nanoparticles of non-magnetic noble metals in the mass state of less than 5 nm, comprising: a) a nucleus formed by a noble metal and b) an anisotropic shell formed by compounds containing at least one covalent bond metal-sulfur.
- the size of the nanoparticles is between 1.0 and 2.0 nm, more preferably between 1.2 and 1.4 nm.
- the noble metal of the core is Au, Pd, Pt, Ag or any non-ferromagnetic metal in the mass state.
- the cortex Anisotropic contains Au-S / Pd-S compounds and Au-SR / Pd-SR compounds in a ratio between 1/1000 and 1000/1 (Au-S / Au-SR or Pd-S / Pd-SR).
- R is an aliphatic chain linked in turn to other molecules, in particular proteins or other biomolecules.
- the magnetic nanoparticles of the present invention may exhibit ferromagnetic behavior, ferromagnetic behavior with low coercive field, or paramagnetic behavior.
- An object of the present invention is also a process for the preparation of said magnetic nanoparticles comprising the reaction of a non-ferromagnetic noble metal precursor with a thiol derivative of the general formula HS-R in stoichiometric excess and in the presence of a reducing agent.
- the non-magnetic noble metal is gold
- the precursor is prepared by reaction of tetrachloroauric acid with any stoichiometric excess quaternary ammonium salt.
- the non-magnetic noble metal is palladium
- the precursor is prepared by reacting any palladium salt, in particular nitrate, sulfate or chloride with any quaternary ammonium salt in stoichiometric excess
- Figure 1 Micrographs obtained by transmission electron microscopy of: a) dodecanothiol-functionalized gold nanoparticles, b) dodecanothiol-functionalized palladium nanoparticles.
- Figure 2 Diagram of the microstructure of a 1.4 nm diameter nanoparticle functionalized with dodecanothiol. The metallic nanoparticle is made up of a core structure.
- Figure 3 XANES spectra for a conventional gold foil (gold foil) and for a sample of thiol functionalized gold nanoparticles (Au-SR).
- Figure 4 Fourier transforms of the EXAFS oscillations for a conventional gold foil (gold foil) and for a sample of thiol functionalized gold nanoparticles (Au-SR).
- Figure 5 Fourier transforms of the EXAFS oscillations for a conventional palladium foil (palladium foil) and for a sample of thiol functionalized palladium nanoparticles (Pd-SR).
- Figure 6 Hysteresis cycles for: a) thiol derivative functionalized gold nanoparticles measured at room temperature and at 5K; b) palladium nanoparticles functionalized with thiol derivative measured at different temperatures.
- Figure 7 Schematic of a biosensor device based on magnetic nanoparticles.
- the object of the present invention is nanoparticles in which the appearance of magnetic behavior is observed.
- These are noble metal nanoparticles, particularly gold and palladium, modified so that a core-shell or "nanocomposite" microstructure is produced, which in turn causes a strong surface anisotropy due to covalent bonds or interaction with dipoles.
- the achievement of the desired magnetic properties is based in all cases on the preparation of colloidal nanoparticles (see Figure 1) of noble metals by reduction of precursor salts according to various conditions: i) Reduction of gold or palladium salts in the presence of thiol derivatives of various organic compounds of the R-SH type.
- R is generally an aliphatic chain.
- the reducer is borohydride.
- reaction is carried out in excess of thiol derivative to achieve the desired microstructure.
- the methods described using the conditions for the generation of very small nanoparticles produce a microstructure formed by a metallic nucleus ( ⁇ 5 nm) and a shell containing metal-sulfur covalent bonds (see Figure 2).
- the presence of this crust, or the presence of superficial dipoles, causes a strong anisotropy in these particles.
- the preparation conditions must be exact to achieve the desired microstructure.
- the ferromagnetic behavior appears by functionalization with thiol derivatives.
- a fundamental parameter that allows evaluating the microstructure of the generated nanoparticles is the X-ray absorption spectrum.
- the near-threshold spectrum (XANES) for the L 3 edge of gold shows the charge transfer from level 5d from Au to S, necessary for the appearance of ferromagnetic behavior in these particles (see figure 3).
- Figure 4 shows the Fourier transform of the EXAFS oscillations, indicating the presence of an extremely small metallic nucleus and the presence of a modified layer of gold covalently linked to sulfur.
- the Fourier transform of the EXAFS oscillations for the K edge of the Pd is shown in Figure 5.
- the phenomenon of hysteresis cycle appearance can extend, depending on the sample, up to room temperature and reach coercive fields of 860 Oe and magnetizations of 1 emu / gr of metal at temperatures of 5K (see Figure 6).
- Several specific cases of magnetic non-magnetic noble metal nanoparticles in the mass state have been characterized and described in detail: i) Gold nanoparticles functionalized with thiols. 1.4 nm diameter nanoparticles as observed by transmission electron microscopy (see Figure 1).
- This inorganic part could be modeled as consisting of a nucleus of 13 gold atoms surrounded by 30 gold atoms linked to 20 interstitial sulfur atoms.
- These 30 gold atoms are all surface and hook to 30 dodecane thiol chains through sulfur atoms covalently linked to gold (see Figure 2).
- These particles present, at room temperature, a magnetization of 0.4 emu / g and a coercive field of 250 Oe. At 5 K the saturation magnetization reaches the value of 1 emu / g, the coercive field being 860 Oe (see Figure 6).
- Palladium nanoparticles functionalized with thiols 1.2 nm diameter nanoparticles embedded in an amorphous mass as seen by transmission electron microscopy (see Figure 1).
- the nanoparticle microstructure is again made up of a very small metal core surrounded by a layer of PdS.
- the polymeric mass into which the particles are embedded is made up of Pd-S bonds with some thiol chains. These particles have a saturation magnetization of 0.15 emu / g and a coercive field with values from 30 Oe to 275 K and up to 50 Oe at 5K (see Figure 6).
- Gold and palladium nanoparticles with diameters of the order of 2 nm or greater functionalized with thiols present the phenomenon with lower magnets and lower coercive fields compared to particles of less than 2 nm. In these cases the microstructure is more typical of a pure metallic nucleus with the surface metal atoms bonded via sulfur to the organic chain.
- the appearance of resonance plasmons in UV-VIS absorption spectra indicates the appearance of electronic delocalization phenomena; while in others the absence of plasmons indicates the location of holes and electrons.
- the physical mechanisms of appearance of magnetic behavior must be different in both types of particles.
- the Stoner ferromagnetism condition occurs as a consequence of the increase in state density at the Fermi level.
- the location of the density of holes produced by the electronic transfer of the levels d of the metal (Au or Pd) to the sulfur atoms must play a fundamental role. No ferromagnetic behavior has been observed in macroscopic palladium sulfide samples.
- the nanoparticles of the present invention can be used in place of radioactive materials used as drug release tracers.
- the use of these magnetic nanoparticles instead of radioactive substances allows to monitor the release of a drug through the measurement of variations in magnetic properties, eliminating the harmful effects of radiation.
- magnetic nanoparticles can be used in vaccination guns as an alternative to vaccine boosters, usually compressed air or gas (particularly helium), which cause pain and skin marks.
- the driving power would come in this case provided by the application of a magnetic field, which would cause the nanoparticles to accelerate as they pass through the epidermis.
- An external AC magnetic field is applied to locally heat a region (eg, a tumor area) in which the magnetic nanoparticles have been deposited or accumulated.
- the supplied preparation may contain, in addition to the metallic core, specific ligands, which in turn can be medications or promote the accumulation of nanoparticles in a specific tissue.
- the system would consist of an AC magnetic field generator perpendicular to the patient's axial direction.
- the system would have an AC frequency also adjustable in the 100 kHz range and a variable field strength from 0 to 15 kA / m.
- Similar systems have been proposed for nanoparticles of ferromagnetic materials in the mass state (see eg A. Jordan et al., J.Mag.Mag.Mat. 225 (2001) 118-126).
- the noble metal magnetic nanoparticles would have important advantages given their very small size, the biocompatible nature of gold and the possibility of tailoring it for each type of treatment, type of tumor, etc.
- Magnetic Resonance (MR) Image Enhancement Magnetic nanoparticles of noble metals can be used to improve imaging in MRI.
- MRI images in some cases lack sufficient contrast to allow efficient viewing of structures such as tumors.
- Said images can be improved using the magnetic nanoparticles as a contrast medium, which would allow, for example, the detection of small tumors and therefore with better treatment possibilities.
- the magnetic nanoparticles of the present invention having noble metals in the core, such as Au or Pd, are especially useful for this application, since metals in the elemental state are better contrast agents than oxides of those same metals.
- these nanoparticles have a better biocompatibility than other nanoparticles, for example Au + Fe in the nucleus.
- Figure 7 illustrates a schematic of a biosensor device based on magnetic nanoparticles functionalized with type A ligands (1).
- type A ligands recognize the type B biomolecule (2)
- the nanoparticle binds and it detects a signal in the magnetic sensor (3) that is separated from the naoparticles by a protective passivation layer (4).
- a set of devices like the one represented in the diagram could be arranged forming a bio-chip unit in which each magnetoresistive sensor could read the signal corresponding to a component of a set of biomolecules.
- An orderly distribution of magnetic noble metal nanoparticles on a support forms the basis for the manufacture of compact discs that use magnetic fields to store the data.
- the reading of the information can be done in turn with a magnetic sensor (magneto-resistive type) or by Kerr effect using a laser.
- Magnetic noble metal nanoparticles are processed and stored in powder form.
- the precursor powder is used in preparations of colloidal solutions (ferrofluids).
- ferrofluids are manufactured in different types of solvents: organic or aqueous.
- Magnetic ink is processed in magnetic printing, barcode writing, etc.
- Two examples of embodiment of the invention are the preparation, microstructural characterization and recording of the ferromagnetic behavior of gold and palladium nanoparticles modified with thiol derivatives.
- Example 1 Ferromagnetic behavior in gold nanoparticles functionalized with dodecanothiol chains
- tetraoctylammonium bromide N (C 8 H ⁇ 7 ) 4 Br, 98%, Aldrich
- HauCU tetrachloroauric acid
- the molar ratio of ammonium salt to gold salt is 2).
- the mixture is subjected to strong magnetic stirring at room temperature and for 30 minutes, until all the gold precursor has been extracted from the aqueous phase to the organic phase.
- aqueous phase is separated and discarded.
- 0.1 ml of dodecanothiol is added (the molar ratio of dodecanothiol to gold precursor is 2) and then, a solution of 0.09 g of sodium borohydride (NaH 4 ) is added dropwise B, 99%, Aldrich) dissolved in 6.25 ml of Milli-Q water (the reducing species is added in excess, 11.7 moles of reducing agent with respect to the gold precursor). It is observed that after a few seconds the solution, previously orange, takes an intense black coloration, due to the formation of the metallic nuclei.
- aqueous phase is again discarded with the help of a settling funnel.
- Toluene from the obtained solution is removed by means of a rotary evaporator, and the metallic particles are then precipitated in 200 ml of absolute ethanol.
- This dispersion is subjected to a temperature of -20 ° C for 8 hours and filtered using a 0.1 micron pore size millipore filter.
- the precipitate remaining in the filter is again redissolved in toluene, precipitated in absolute ethanol and filtered. This process is repeated three times in order to remove traces of dodecanethiol and possible impurities.
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES05735150T ES2401149T3 (es) | 2004-03-25 | 2005-03-23 | Nanopartículas magnéticas de metales nobles |
CA2560892A CA2560892C (en) | 2004-03-25 | 2005-03-23 | Magnetic nanoparticles of noble metals |
JP2007504428A JP5478015B2 (ja) | 2004-03-25 | 2005-03-23 | 貴金属の磁気ナノ粒子 |
EP05735150A EP1746610B1 (en) | 2004-03-25 | 2005-03-23 | Magnetic nanoparticles of noble metals |
AU2005226898A AU2005226898B2 (en) | 2004-03-25 | 2005-03-23 | Magnetic nanoparticles of noble metals |
US11/525,119 US7960025B2 (en) | 2004-03-25 | 2006-09-22 | Magnetic nanoparticles comprising a core formed from noble metals |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES200400735A ES2242528B1 (es) | 2004-03-25 | 2004-03-25 | Nanoparticulas magneticas de metales nobles. |
ESP200400735 | 2004-03-25 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/525,119 Continuation US7960025B2 (en) | 2004-03-25 | 2006-09-22 | Magnetic nanoparticles comprising a core formed from noble metals |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2005091704A2 true WO2005091704A2 (es) | 2005-10-06 |
WO2005091704A3 WO2005091704A3 (es) | 2005-12-29 |
Family
ID=35056599
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/ES2005/070035 WO2005091704A2 (es) | 2004-03-25 | 2005-03-23 | Nanopartículas magnéticas de metales nobles |
Country Status (7)
Country | Link |
---|---|
US (1) | US7960025B2 (es) |
EP (1) | EP1746610B1 (es) |
JP (1) | JP5478015B2 (es) |
AU (1) | AU2005226898B2 (es) |
CA (1) | CA2560892C (es) |
ES (2) | ES2242528B1 (es) |
WO (1) | WO2005091704A2 (es) |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009535497A (ja) * | 2006-04-12 | 2009-10-01 | ナノマス テクノロジーズ インコーポレイテッド | ナノ粒子、その製造方法、およびその用途 |
WO2011154711A1 (en) | 2010-06-10 | 2011-12-15 | Midatech Limited | Peptide-carrying nanoparticles |
WO2011156711A1 (en) | 2010-06-10 | 2011-12-15 | Schobel Alexander M | Nanoparticle film delivery systems |
WO2013034741A1 (en) | 2011-09-07 | 2013-03-14 | Midatech Limited | Nanoparticle tumour vaccines |
WO2013034726A1 (en) | 2011-09-07 | 2013-03-14 | Midatech Limited | Nanoparticle-peptide compositions |
WO2014122444A1 (en) | 2013-02-05 | 2014-08-14 | Midatech Limited | Permeation enhanced active-carrying nanoparticles |
WO2014125256A1 (en) | 2013-02-12 | 2014-08-21 | Midatech Limited | Nanoparticle delivery compositions |
WO2014135841A1 (en) | 2013-03-04 | 2014-09-12 | Midatech Limited | Nanoparticle peptide compositions |
WO2014135840A1 (en) | 2013-03-04 | 2014-09-12 | Midatech Limited | Nanoparticle peptide compositions |
WO2015114341A1 (en) | 2014-01-31 | 2015-08-06 | Midatech Limited | Nanoparticle-insulin and insulin analogue compositions |
WO2018141940A1 (en) | 2017-02-02 | 2018-08-09 | Midatech Limited | Nanoparticle-based liver-targeting therapy |
WO2020109428A1 (en) | 2018-11-29 | 2020-06-04 | Midatech Ltd | Therapeutic compounds, nanoparticles and uses thereof |
WO2020120785A1 (en) | 2018-12-14 | 2020-06-18 | Midatech Ltd | Antifolate-carrying nanoparticles and their use in medicine |
WO2020120787A1 (en) | 2018-12-14 | 2020-06-18 | Midatech Ltd | Nanoparticle-based therapy of inflammatory disorders |
US10688125B2 (en) | 2014-12-23 | 2020-06-23 | Midatech Ltd. | Nanoparticles and their use in cancer therapy |
US11179474B1 (en) | 2015-07-24 | 2021-11-23 | Midatech Limited | Nanoparticle-based liver-targeting therapy and imaging |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2320837B1 (es) * | 2007-07-26 | 2010-03-04 | Consejo Superior De Investigaciones Cientificas | Dispositivo de hipertermia y su utilizacion con nanoparticulas. |
US8389175B2 (en) * | 2008-05-16 | 2013-03-05 | Utc Power Corporation | Fuel cell having a stabilized cathode catalyst |
WO2009139747A1 (en) * | 2008-05-16 | 2009-11-19 | Utc Power Corporation | A stabilized platinum catalyst |
KR101127056B1 (ko) * | 2008-09-25 | 2012-03-23 | 삼성전기주식회사 | 금속 씨앗을 이용한 금속 나노 입자의 제조 방법 및 금속씨앗을 함유하는 금속 나노 입자 |
US20120076830A1 (en) * | 2008-12-01 | 2012-03-29 | Sitharaman Balaji | Differentiation of stem cells with nanoparticles |
US8114807B2 (en) * | 2010-03-05 | 2012-02-14 | Cem Corporation | Synthesis and use of intermetallic iron palladium nanoparticle compositions |
IN2012DE01790A (es) * | 2012-08-11 | 2015-10-16 | Council Scient Ind Res | |
ES2446359B1 (es) * | 2012-09-07 | 2014-12-23 | Mikel LARRAÑAGA OTANO | Cartucho para armas de fuego y método para su identificación |
US10261387B2 (en) * | 2014-01-30 | 2019-04-16 | Isee, Llc | Vision correction system |
US20180003960A1 (en) * | 2014-01-30 | 2018-01-04 | Duke Ellington Cooke, JR. | Vision correction system |
US20160358708A1 (en) * | 2014-11-17 | 2016-12-08 | John Kissane | Production of supermagnet |
US9627114B2 (en) * | 2015-09-14 | 2017-04-18 | Elwha Llc | Magnetic plasmonic nanoparticle positioned on a magnetic plasmonic substrate |
US9627115B2 (en) * | 2015-09-14 | 2017-04-18 | Elwha Llc | Magnetic plasmonic nanoparticle dimer |
CN109283206B (zh) * | 2018-11-02 | 2021-07-06 | 东南大学 | 一种用于生物标志物的核磁共振快速检测装置及方法 |
KR102461313B1 (ko) * | 2020-05-19 | 2022-11-01 | 엠케이전자 주식회사 | 리버스 리플로우용 심재를 이용한 반도체 패키지 |
CN115155469B (zh) * | 2022-07-26 | 2023-10-27 | 中国科学院苏州纳米技术与纳米仿生研究所 | 水溶性ib族贵金属亚10纳米胶粒、其制备方法及应用 |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5294369A (en) * | 1990-12-05 | 1994-03-15 | Akzo N.V. | Ligand gold bonding |
AU1743397A (en) * | 1995-12-28 | 1997-07-28 | James R. Heath | Organically-functionalized monodisperse nanocrystals of metals |
WO2000076699A1 (en) * | 1999-06-15 | 2000-12-21 | Kimoto, Masaaki | Ultrafine composite metal powder and method for producing the same |
JP4361168B2 (ja) | 1999-06-18 | 2009-11-11 | 独立行政法人科学技術振興機構 | 有機・無機複合磁性材料とその製造方法 |
AUPQ326499A0 (en) | 1999-10-05 | 1999-10-28 | Commonwealth Scientific And Industrial Research Organisation | Nanoparticle films |
ATE487136T1 (de) * | 2000-03-28 | 2010-11-15 | Nanosphere Inc | Nanopartikel mit gebundenen oligonukleotiden und verwendungen derselben |
WO2002018643A2 (en) * | 2000-08-11 | 2002-03-07 | Nanosphere Inc. | Nanoparticles having oligonucleotides attached thereto and uses therefor |
GB0025414D0 (en) * | 2000-10-16 | 2000-11-29 | Consejo Superior Investigacion | Nanoparticles |
WO2003025035A2 (de) * | 2001-09-14 | 2003-03-27 | Merck Patent Gmbh | Formkörper aus kern-mantel-partikeln |
WO2003035829A2 (en) * | 2001-10-09 | 2003-05-01 | Nanosphere, Inc. | Nanoparticles having oligonucleotides attached thereto and uses therefor |
JP2003132519A (ja) | 2001-10-25 | 2003-05-09 | Hitachi Ltd | 磁性ナノ粒子で形成された磁気記録媒体およびそれを用いた記録方法 |
JP2003288812A (ja) * | 2001-12-29 | 2003-10-10 | Samsung Electronics Co Ltd | 金属ナノ粒子クラスターインクおよびこれを用いた金属パターン形成方法 |
WO2003057175A2 (en) | 2002-01-02 | 2003-07-17 | Visen Medical, Inc. | Amine functionalized superparamagnetic nanoparticles for the synthesis of bioconjugates and uses therefor |
WO2003072830A1 (en) | 2002-02-22 | 2003-09-04 | Purdue Research Foundation | Magnetic nanomaterials and methods for detection of biological materials |
EP1339075A1 (en) | 2002-02-25 | 2003-08-27 | Motorola, Inc. | Magnetic nanomaterials and synthesis method |
US6929675B1 (en) * | 2003-04-24 | 2005-08-16 | Sandia Corporation | Synthesis metal nanoparticle |
-
2004
- 2004-03-25 ES ES200400735A patent/ES2242528B1/es not_active Expired - Fee Related
-
2005
- 2005-03-23 EP EP05735150A patent/EP1746610B1/en not_active Not-in-force
- 2005-03-23 WO PCT/ES2005/070035 patent/WO2005091704A2/es active Application Filing
- 2005-03-23 JP JP2007504428A patent/JP5478015B2/ja not_active Expired - Fee Related
- 2005-03-23 CA CA2560892A patent/CA2560892C/en not_active Expired - Fee Related
- 2005-03-23 AU AU2005226898A patent/AU2005226898B2/en not_active Ceased
- 2005-03-23 ES ES05735150T patent/ES2401149T3/es active Active
-
2006
- 2006-09-22 US US11/525,119 patent/US7960025B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
HARADA ET AL., CHEM. LETT., 2002, pages 31 |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009535497A (ja) * | 2006-04-12 | 2009-10-01 | ナノマス テクノロジーズ インコーポレイテッド | ナノ粒子、その製造方法、およびその用途 |
WO2011154711A1 (en) | 2010-06-10 | 2011-12-15 | Midatech Limited | Peptide-carrying nanoparticles |
WO2011156711A1 (en) | 2010-06-10 | 2011-12-15 | Schobel Alexander M | Nanoparticle film delivery systems |
US8568781B2 (en) | 2010-06-10 | 2013-10-29 | Midatech Limited | Peptide-carrying nanoparticles |
WO2013034741A1 (en) | 2011-09-07 | 2013-03-14 | Midatech Limited | Nanoparticle tumour vaccines |
WO2013034726A1 (en) | 2011-09-07 | 2013-03-14 | Midatech Limited | Nanoparticle-peptide compositions |
WO2014122444A1 (en) | 2013-02-05 | 2014-08-14 | Midatech Limited | Permeation enhanced active-carrying nanoparticles |
US10300022B2 (en) | 2013-02-12 | 2019-05-28 | Midatech Ltd. | Nanoparticle delivery compositions |
WO2014125256A1 (en) | 2013-02-12 | 2014-08-21 | Midatech Limited | Nanoparticle delivery compositions |
WO2014135841A1 (en) | 2013-03-04 | 2014-09-12 | Midatech Limited | Nanoparticle peptide compositions |
WO2014135840A1 (en) | 2013-03-04 | 2014-09-12 | Midatech Limited | Nanoparticle peptide compositions |
US9114082B2 (en) | 2013-03-04 | 2015-08-25 | Midatech Limited | Nanoparticle peptide compositions |
WO2015114341A1 (en) | 2014-01-31 | 2015-08-06 | Midatech Limited | Nanoparticle-insulin and insulin analogue compositions |
US9352026B2 (en) | 2014-01-31 | 2016-05-31 | Midatech Limited | Nanoparticle-insulin and insulin analogue compositions |
US10688125B2 (en) | 2014-12-23 | 2020-06-23 | Midatech Ltd. | Nanoparticles and their use in cancer therapy |
US11179474B1 (en) | 2015-07-24 | 2021-11-23 | Midatech Limited | Nanoparticle-based liver-targeting therapy and imaging |
WO2018141940A1 (en) | 2017-02-02 | 2018-08-09 | Midatech Limited | Nanoparticle-based liver-targeting therapy |
WO2020109428A1 (en) | 2018-11-29 | 2020-06-04 | Midatech Ltd | Therapeutic compounds, nanoparticles and uses thereof |
WO2020120785A1 (en) | 2018-12-14 | 2020-06-18 | Midatech Ltd | Antifolate-carrying nanoparticles and their use in medicine |
WO2020120787A1 (en) | 2018-12-14 | 2020-06-18 | Midatech Ltd | Nanoparticle-based therapy of inflammatory disorders |
Also Published As
Publication number | Publication date |
---|---|
ES2242528B1 (es) | 2006-12-01 |
CA2560892C (en) | 2012-10-16 |
US7960025B2 (en) | 2011-06-14 |
US20070151631A1 (en) | 2007-07-05 |
AU2005226898A1 (en) | 2005-10-06 |
AU2005226898B2 (en) | 2010-05-27 |
ES2242528A1 (es) | 2005-11-01 |
JP5478015B2 (ja) | 2014-04-23 |
JP2007533847A (ja) | 2007-11-22 |
WO2005091704A3 (es) | 2005-12-29 |
CA2560892A1 (en) | 2005-10-06 |
EP1746610A2 (en) | 2007-01-24 |
ES2401149T3 (es) | 2013-04-17 |
EP1746610B1 (en) | 2012-12-19 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
ES2401149T3 (es) | Nanopartículas magnéticas de metales nobles | |
Ma et al. | Magnetic nanoparticles: Synthesis, anisotropy, and applications | |
Wu et al. | Organic phase syntheses of magnetic nanoparticles and their applications | |
Insin et al. | Incorporation of iron oxide nanoparticles and quantum dots into silica microspheres | |
De Toro et al. | Remanence plots as a probe of spin disorder in magnetic nanoparticles | |
Wang et al. | Synthesis and magnetic properties of uniform hematite nanocubes | |
Lu et al. | Magnetic nanoparticles: synthesis, protection, functionalization, and application | |
Lacroix et al. | Stable single-crystalline body centered cubic Fe nanoparticles | |
Dai et al. | Monodisperse cobalt ferrite nanomagnets with uniform silica coatings | |
Park et al. | Synthesis and magnetic studies of uniform iron nanorods and nanospheres | |
Strable et al. | Synthesis and characterization of soluble iron oxide− dendrimer composites | |
Tartaj et al. | Synthesis of nanomagnets dispersed in colloidal silica cages with applications in chemical separation | |
Li et al. | Synthesis and characterization of monodisperse magnetic Fe3O4@ BSA core–shell nanoparticles | |
Piñeiro et al. | Hybrid nanostructured magnetite nanoparticles: From bio-detection and theragnostics to regenerative medicine | |
Xu et al. | In situ one-pot synthesis of Fe2O3@ BSA core-shell nanoparticles as enhanced T1-weighted magnetic resonance imagine contrast agents | |
Babić-Stojić et al. | Magnetic and structural studies of CoFe2O4 nanoparticles suspended in an organic liquid | |
Zayed et al. | Preparation and structure characterization of hematite/magnetite ferro-fluid nanocomposites for hyperthermia purposes | |
Escoda-Torroella et al. | Selective control over the morphology and the oxidation state of iron oxide nanoparticles | |
Adhikari et al. | Synthesis of magnetite nanorods from the reduction of iron oxy-hydroxide with hydrazine | |
Rebolledo et al. | Iron oxide nanosized clusters embedded in porous nanorods: a new colloidal design to enhance capabilities of MRI contrast agents | |
Núñez et al. | Yttria-coated FeCo magnetic nanoneedles | |
Zayed et al. | Analytical characterization of hematite/magnetite ferrofluid nanocomposites for hyperthermia purposes | |
Acidereli et al. | Magnetic nanoparticles | |
Ali et al. | Size and shape control synthesis of iron oxide–based nanoparticles: current status and future possibility | |
Hanini et al. | Ferrite nanoparticles for cancer hyperthermia therapy |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A2 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A2 Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
WWE | Wipo information: entry into national phase |
Ref document number: 11525119 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2007504428 Country of ref document: JP Ref document number: 2560892 Country of ref document: CA |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWW | Wipo information: withdrawn in national office |
Country of ref document: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2005735150 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2005226898 Country of ref document: AU |
|
ENP | Entry into the national phase |
Ref document number: 2005226898 Country of ref document: AU Date of ref document: 20050323 Kind code of ref document: A |
|
WWP | Wipo information: published in national office |
Ref document number: 2005226898 Country of ref document: AU |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWP | Wipo information: published in national office |
Ref document number: 2005735150 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 11525119 Country of ref document: US |