38 results about "Platinum nanoclusters" patented technology

The invention discloses a gold/platinum bimetal nanocluster fluorescence probe based on polyethyleneimine protection, and an application of the fluorescence probe in aureomycin detection, and belongs to the technical field of fluorescence probes. A bimetal gold/platinum nanocluster has a great Stokes shift (about 150nm), can stably exist in a solution with extreme pH (potential of hydrogen) and high ion concentration, and releases stable fluorescence under long-time ultraviolet irradiation, so that a wide application of the nanocluster in the fields of medicines and biology is facilitated. In addition, the probe is used for detecting tetracycline antibiotics based on a mechanism of fluorescence quenching, and aureomycin can be distinguished from tetracycline by adding Al<3+> based on a mechanism of fluorescence enhancement, so that the purpose of specific aureomycin detection is achieved. The probe is used for detecting the aureomycin; a linear range is 0.5-30 micrometers; and a detection limit is 0.5 micrometers. In addition, real object detection is successfully performed on the aureomycin in milk by the fluorescence probe, and a good effect is obtained, so that the fluorescence probe can be used for detecting aureomycin residues in food.

The invention discloses a preparation method of platinum nanoclusters and application of the platinum nanoclusters in tumor imaging agents and apoptosis agents. The preparation method comprises the following specific steps of: mixing a platinum salt solution and ascorbic acid (VC) and reduced glutathione (GSH), and heating in a water bath, wherein the synthesis speed and the particle size of the platinum nanoclusters are controlled by adjusting the pH and temperature of a solution and a ratio of components. The prepared platinum nanoclusters have a small particle size, good permeability, and excellent biocompatibility and stable fluorescence characteristics, can be used for high spatial and temporal resolution imaging on tumors and other lesion sites, and can effectively promote tumor cell apoptosis and tumor tissue ablation; the method and the application are simple and easy to implement, the toxicity is low, the sensitivity is high, the multi-mode real-time dynamic monitoring can be carried out, and the medical clinical application value and prospect are broad.

The invention provides a thermosensitive polymer-modified bivalent platinum nanocluster and a preparation method and application thereof. The bivalent platinum nanocluster has a core-shell structure,the inner core comprises zero-valent platinum with divalent platinum on the surface and the shell is a temperature-sensitive polymer. The preparation method utilizes a thermosensitive polymer ligand as a template to synthesize bivalent platinum nanoclusters with different relative contents of divalent platinum and zero-valent platinum. Through adjustment and control of the relative content of divalent platinum and zero-valent platinum, the relative interaction intensity of the photothermal effect and the chemotherapy effect is precisely adjusted and controlled so that photothermal chemotherapy-combined anti-tumor effects are optimized.

The invention discloses a kit for detecting trypsin and the inhibitor thereof based on platinum nanoclusters. The kit is characterized in that synthesized platinum nanocluster simulated oxidase is utilized to catalyze the color development of the coupling product of 3-Methyl-2-benzothiazolinone hydrazone hydrochloride monohydrate and N-ethyl-N-(2-hydroxy-3-sulfopropyl)-3-methylaniline sodium salt;protamine makes platinum nanoclusters aggregate by means of an electrostatic effect, so that the catalytic activity of the nanoclusters is decreased; the protamine is hydrolyzed by trypsin, and so that the trypsin can effectively inhibit the effect of the protamine on the aggregation of the platinum nanoclusters. Therefore, on the basis of solution color change and ultraviolet absorption spectrumfeature change, the kit can be directly used for the determination of the trypsin and the content of the inhibitor of the trypsin. The rapid detection method provided by the invention does not need complicated chemical modification or signal labeling, has strong anti-interference capacity, can quickly and accurately realize the rapid detection of the trypsin, and is suitable for clinical application, for example the diagnosis of diseases such as pancreatitis.

The invention provides an application of a supported platinum nano-cluster catalyst in an alkane anaerobic dehydrogenation reaction. The catalyst takes an oxide as a carrier and platinum nano-clusters as an active component, the platinum nano-clusters are monodispersed on the oxide carrier, and the platinum nano-clusters are composed of ligands and platinum atoms; the ligand is at least one of organic phosphorus and mercaptan; the platinum atoms are diatoms or polyatoms. The preparation method of the catalyst comprises the following steps: (1) preparing a diatomic or polyatomic platinum nano-cluster; (2) loading the diatomic or polyatomic platinum nano-cluster on the carrier; and (3) post-treatment of the catalyst. The catalyst prepared by the method has high-dispersion nanoscale platinum nano-clusters, and has high selectivity to olefin in the anaerobic dehydrogenation reaction of alkane such as propane and the like.

The invention belongs to the technical field of new materials, and especially relates to a preparation method and an application of fluorescent platinum nanoclusters for optical imaging of blood system suspension cells. The preparation method comprises the following steps: achieving cooperation of a platinum ion precursor aqueous solution and an amine polymer; performing full complexing by an amine group; adding a reducing agent at a high temperature to airtightly stir; preparing a crude product of the fluorescent platinum nanoclusters; and finally obtaining a water-soluble fluorescent platinum nanocluster after ultracentrifugation and dialysis A prepared fluorescent platinum nanocluster with an ultra-small size can be applied to the optical imaging of the blood system suspension cells. The invention provides the preparation method of the platinum nanoclusters which has the characteristics of simple operation, environmental protection, and excellent fluorescence performance. An adherent cell system can be calibrated; and the preparation method extends the platinum nanoclusters as fluorescent markers for the first time into the optical imaging of the blood system suspension cells, and is of great significance for early identification and diagnosis of blood system diseases.

The invention provides a platinum nano-cluster based on papain as a template and a preparation method and application of the platinum nano-cluster. The preparation method specifically comprises the following steps: mixing a papain solution with an aqueous solution of a high-valence platinum complex, adding a NaOH solution to adjust the pH value to 8-13, and completely reacting in a dark water bath. The platinum nano-cluster prepared by the method is sensitive to lysozyme response, a detection system is simple, convenient and controllable to operate and short in consumed time, and the platinumnano-cluster can be applied to detection of lysozyme content in urine. The prepared papain platinum nano-cluster greatly enhances the activity of papain, so that the synthesis substance can be used for tracking the application effect of papain and detecting the content of lysozyme in a sample on the basis of the fluorescence characteristic besides the original application of the papain in the aspects of medicines, foods, feeds, textiles and the like.

The invention discloses a preparation method of a platinum nanocluster with uricase-like activity. Chloroplatinic acid is used as a reactant metal precursor, protamine is used as a modifier to stabilize and induce platinum nanoparticles to form a multistage cluster structure. The prepared platinum nanocluster has uricase-like activity, and the activity of the platinum nanocluster is comparable with that of natural uricase; the preparation method is simple, easy to operate, one-step in synthesis and easy for batch production; reaction conditions are mild, only normal temperature and normal pressure are needed, safety, no pollution and environmental friendliness are achieved, equipment investment is small, cost is low, and reproducibility is good; the used protein is high in safety and goodin thermal stability, and has quite high nutrition and functionality; the obtained product has the characteristics of no toxicity, good biocompatibility, simple purification and storage, good stability, high catalytic activity and the like, and has an important value in treatment of human hyperuricemia related diseases (such as gout).

The invention discloses preparation and application of a self-supporting nitrogen-doped carbon nanotube loaded platinum nano-cluster, and the structural unit of the self-supporting nitrogen-doped carbon nanotube loaded platinum nano-cluster takes carbon cloth as a precursor and nitrogen-doped carbon nanotubes (NCNTs) as a conductive network, and platinum nano-clusters are loaded on the carbon cloth. The preparation method comprises the following steps: taking carbon cloth as a precursor, and preparing the ferrocobalt nanowire from cobalt nitrate hexahydrate, iron nitrate nonahydrate, ammonium fluoride and urea; and preparing the nitrogen-doped carbon nanotube from the carbon cloth on which the ferrocobalt nanowire grows and dicyandiamide. According to the application of the direct methanol fuel cell three-function catalyst in catalyzing ORR and MOR reactions of a direct methanol fuel cell and the electro-catalytic performance in HER reactions, the adsorption efficiency of adsorbed gas can be remarkably enhanced, the stability and the conductivity are improved, and the direct methanol fuel cell three-function catalyst has relatively low overpotential and cost in ORR, MOR and HER reactions and can meet the requirements of commercial application.

The invention discloses a urine detection method of platinum super-nanoparticles based on hypoxia response and application of the urine detection method. The platinum super-nano particle PNCA is formed by covalently connecting an aminated super-small platinum nano-cluster and 4, 4 '-dicarboxylic acid azobenzene azo with hypoxia response through an EDC/NHS reaction, and after the surface of the platinum super-nano particle PNCA is coated with a layer of hyaluronic acid HA, the nano particle can specifically target a tumor site. Afterwards, under the action of reductase in the hypoxic environment at the tumor site, the PNCA nanoparticles can be reduced and degraded into many small PtNCs to enter blood circulation again, and the PNCA nanoparticles can be excreted into urine from the kidney for disease state detection due to the fact that the particle size of the PNCA nanoparticles is smaller than the critical value 5.5 nm capable of being removed by the kidney. Due to the excellent hypoxia response effect of the PNCA nanoparticles and the efficient kidney clearing effect of the PtNCs, the PNCA/PtNCs composite material has obvious advantages in living body application.

A caged platinum nanocluster complex is disclosed. The complex comprises (a) an amine-terminated dendrimer; and (b) a platinum nanocluster comprising platinum oxides, the platinum nanocluster being confined inside of the amine-terminated dendrimer. The complex exhibits cytotoxicity to cancer cells. A double-caged platinum nanocluster complex is also disclosed, which comprises polyethylene glycol (PEG) coated on the surface of a dendrimer caged platinum nanocluster complex. The double-caged caged platinum nanocluster complex comprises pH-sensitive bonds on the surface thereof. Also disclosed are methods of preparing and using the same.

A catalyst that includes heterogeneous metal carbide nanomaterials and a novel preparation method to synthesize the metal carbide nanomaterials under relatively mild conditions to form an encapsulated transition metal and/or transition metal carbide nanoclusters in a support and/or binder. The catalyst may include confined platinum carbide nanoclusters. The preparation may include the treatment of encapsulated platinum nanoclusters with ethane at elevated temperatures. The catalysts may be used for catalytic hydrocarbon conversions, which include but are not limited to, ethane aromatization, and for selective hydrogenation, with negligible green oil production.

The invention relates to the technical field of synthesis of gold-platinum nano-clusters, in particular to a preparation method of chicken protein-gold nano-clusters and application of the chicken protein-gold nano-clusters in quercetin detection.The preparation method comprises the following specific steps that egg white serves as a template, and an egg white-gold nano-cluster stock solution is prepared under the specific pH condition; under the excitation wavelength of 365 nm, the gold nanocluster shows red fluorescence, and the maximum emission peak is located at the position of 665 nm; as an effective environment-friendly fluorescent probe, the gold nano-cluster can be used for detecting quercetin (Que) in a solution. The fluorescent gold nano-cluster has unique photophysical characteristics, is simple to prepare, low in toxicity and high in stability, the quercetin detection method is rapid and simple, the detection sensitivity is high, and the fluorescent gold nano-cluster is an ideal fluorescent nano-material applied to the fields of biology and medicine.

The invention relates to a method for detecting escherichia coli O157: H7 based on a core-shell gold-platinum nanocluster, and belongs to the technical field of microbiological detection and pretreatment. According to the method, the core-shell type gold-platinum nanocluster is used as mimic enzyme, streptavidin is adsorbed on the surface of the gold-platinum nanocluster through electrostatic interaction, and then a biotinylated specific aptamer and the gold-platinum nanocluster are combined so as to serve as a probe, so that specific recognition of the escherichia coli O157: H7 is promoted. On the basis of a sandwich method strategy, an aptamer modified magnetic bead is used as a capture probe, interference of complex matrixes in a sample on a detection result is reduced through a magnetic attraction effect; a biotin-avidin system is adopted to modify the aptamer on the surface of the gold-platinum nanocluster, so that steric hindrance is reduced, and the loading capacity of recognition molecules is improved. According to the method of the invention, synchronous recognition of the escherichia coli O157: H7 is realized, the operation steps are simplified, the reaction time is greatly shortened, the detection sensitivity is improved to 102 CFU/mL, the cost is reduced, the influence of a sample matrix is reduced, and the detection efficiency is improved. The method has a bright application prospect.

The invention belongs to the technical field of biosensors and relates to preparation and application of a biosensor based on an N-graphene nanobelt-gold-platinum nano-cluster. A glassy carbon electrode is used as a working electrode, and an N-graphene nanobelt-gold-platinum nano-cluster compound is used for modification. The glassy carbon electrode is adopted, the price is low, the electrochemical technology and the biosensing technology are combined, selectivity of the sensor is improved, sample pretreatment is not needed for a sample, the detection time is shortened, meanwhile, detection cost is reduced, and the detection method is rapid, low in price and high in sensitivity and selectivity.

The invention discloses an electroreduced graphene oxide-nickel biscorrole/platinum nanocluster, and a preparation method and an application thereof. A graphene oxide-nickel biscorrole supermolecularcomposite material is prepared from nickel biscorrole and graphene oxide by using a non-covalent pi-pi stacking principle, a highly dispersed platinum nanocluster is synthesized by using graphene oxide-nickel biscorrole as a support matrix in order to prepare a ternary composite material, and the graphene oxide is reduced through an electrochemical technology by using the ternary composite material. The electroreduced graphene oxide-nickel biscorrole/Pt composite material has an extremely high electrocatalytic oxidation activity to methanol, and can be used in a methanol fuel cell. The preparation method is simple and convenient, and is easy to operate; and the prepared supermolecular compound has an extremely high stability as a methanol oxidation catalyst, and has extremely strong tolerance to CO possibly generated during methanol oxidation.

A catalyst that includes heterogeneous metal carbide nanomaterials and a novel preparation method to synthesize the metal carbide nanomaterials under relatively mild conditions to form an encapsulated transition metal and/or transition metal carbide nanoclusters in a support and/or binder. The catalyst may include confined platinum carbide nanoclusters. The preparation may include the treatment of encapsulated platinum nanoclusters with ethane at elevated temperatures. The catalysts may be used for catalytic hydrocarbon conversions, which include but are not limited to, ethane aromatization, and for selective hydrogenation, with negligible green oil production.

The invention provides a green, simple and efficient fluorescent platinum nano-cluster and a preparation method and application thereof. The preparation method comprises the following steps: mixing acellulase solution with an H2PtCl6 solution, and sufficiently and uniformly mixing for 5-10 minutes by using a vortex device; adjusting the pH value of the NaOH solution to be 8-13, and uniformly mixing for 5-10 minutes again by using the vortex device; and reacting the prepared sample in a water bath kettle in a dark place for 6-24 hours. The nano-cluster shows blue fluorescence under the irradiation of a 305nm ultraviolet lamp, the maximum excitation wavelength of the nano-cluster is 350nm, and the maximum emission wavelength of the nano-cluster is 440nm. A detection method for detecting theampicillin concentration in an actual sample by using the fluorescent cellulase platinum nano-cluster is also established, and the method is stable, rapid, sensitive, strong in specificity and good in reproducibility, and can be used for monitoring the ampicillin content in the fields of environment, food, medicine, agricultural production and the like.