The invention relates to a system comprising superparamagnetic or anhysteretic nanoparticles (NPs) functionalised with an antibody, and a thin-film-type substrate of metal or an oxide thereof, functionalised with the same antibody; and to a method for detecting a biological analyte, such as a cell, protein, microorganism or similar, preferably a pathogenic microorganism, and even more preferably Listeria. The method comprises: (a) obtaining a control signal from a substrate (magnetic or not) coated with a thin film of metal or an oxide thereof, preferably gold, which can be functionalised with an antibody, the control signal being a magnetoresistance signal, a total magnetisation signal or a signal of the magnetisation curve; (b) mixing superparamagnetic or anhysteretic NPs functionalised with the antibody, with a liquid sample to analyse and confirm the presence or absence of the biological analyte, the NPs and the liquid sample making contact for 10-90 minutes; (c) dripping the dispersion obtained in step (b) onto the substrate of step (a), and then washing to remove NPs that are not chemically anchored to the surface of the biological analyte; (d) leaving the substrate to dry and re-measuring a signal in the same way as carried out in step (a); and (e) counteracting the control signal obtained in step (a) and the signal obtained in step (d), and in the absence of differences between the two measurements, confirming the absence of the biological analyte in the sample, the amount of microorganisms being directly proportional to the signal measured.

The present disclosure belongs to the technical field of analytical chemistry, in particular to synthesis and application of a nanomaterial for removal of patulin (Pat). The present disclosure adopts 2-Oxin as a substitute template, AM as a functional monomer, and synthetic Fe.sub.3O4@SiO.sub.2@CS-GO magnetic nanoparticles as a carrier, for preparing a magnetic MIP specific for Pat adsorption by surface imprinting. The addition of Fe.sub.3O.sub.4 makes the finally prepared molecular imprinted adsorbent material magnetic, thereby facilitating separation of a material from a matrix, eliminating complicated operation steps such as filtration and centrifugation, and facilitating recovery of materials.

The invention is directed to hydrophilic and hydrophobic superparamagnetic nanoparticles and their use as contrast agents for NMR including agents that distinguish oil and water in NMR logging of geological formations containing oil or water. Methods of making these SPIONs are also described.

A method for making an iron-based oxide magnetic powder includes adding raw material solution containing trivalent iron ions, or trivalent iron ions and ions of a metal element that partially substitutes Fe sites, and an alkaline aqueous solution for neutralizing the raw material solution to a reaction system to adjust the pH of the reaction system to 1.0 or higher and 3.0 or lower. Hydroxycarboxylic acid is added to the obtained reaction solution and thereafter the pH of the reaction system is neutralized to 7.0 or higher and 10.0 or lower. The obtained precipitate of a substituent metal element-containing iron oxyhydroxide is coated with silicon oxide and then heated, whereby an iron-based oxide magnetic powder is obtained with a reduced content of fine and coarse particles, a particle shape close to a perfect sphere, and particles of ε-iron oxide in which Fe sites are partially substituted by other metal elements.

Methods of, inter alia, detecting the presence of one or more analytes in one or more query samples include providing one or more sensor that each include biomolecules disposed on a functionalized surface of one or more giant magnetoresistance (GMR) sensors. Modes of operation remove or add magnetic beads from the vicinity of sensor surfaces by interactions with the biomolecules. The methods feature, inter alia, detecting the presence of one or more analytes in one or more query samples by measuring magnetoresistance change of the one or more GMR sensors based on determining magnetoresistance before and after passing magnetic particles over the one or more sensors.

The invention is directed to hydrophilic and hydrophobic superparamagnetic nanoparticles and their use as contrast agents for NMR including agents that distinguish oil and water in NMR logging of geological formations containing oil or water. Methods of making these SPIONs are also described.

The present application relates to a composition, a 3D printing method using the same, and a three-dimensional shape comprising the same, and provides a composition capable of embodying a precise formation of a three-dimensional shape using a ceramic material and a uniform curing property of the three-dimensional shape.

The present invention relates to particles comprising a core, in particular a magnetic core, and a first coating of a first shell material, wherein a second coating of a second shell material is applied to the surface of the first coating facing away from the core, the second shell material is different from the first shell material and has a higher refractive index than the first shell material.

The present invention relates to a method for reducing or preventing the formation or activity of a corrosion-associated biofilm on a metal surface, wherein the method comprises contacting the metal surface with a liquid composition comprising biocidal preparation. The present invention also relates to a microbicidal composition comprising at least one alcohol, one liquid hydrocarbon, a bacteriophage immobilized on a magnetic nanocomposite, at least one phage releasing reagent and one stabilizer. The microbicide composition and method of the present invention reduces biofilms on surfaces, and consequently, reduces, mitigates, or eliminates MIC in internal surface of the oil transporting pipelines.

Provided in the present invention are a magnetic nanosphere coated with modified cardiolipin, and manufacturing method thereof. The magnetic nanosphere coated with modified cardiolipin comprises a modified cardiolipin, a biotin derivative, and a streptavidin magnetic bead. The modified cardiolipin is coupled to the biotin derivative via an —NH—CO structure. The streptavidin magnetic bead is a magnetic nanosphere coupled to streptavidin, and the biotin derivative is coupled to the streptavidin.