Abstract:
In accordance with embodiments herein a method for capturing cells of interest in a digital microfluidic system is provided, comprising utilizing a droplet actuator to transport a sample droplet to a microwell device. The microwell device includes a substrate having a plurality of microwells that open onto a droplet operations surface of the microwell device. The sample droplet includes cells of interest that enter the microwells. The method introduces capture beads to the microwells, and the capture elements are immobilized on the capture beads. The method utilizes the droplet actuator to transport a cell lysis reagent droplet to the microwell device. Portions of the cell lysis reagent droplet enter the microwells and, during an incubation period, cause the cells of interest to release analyte that is captured by the capture elements on the capture beads.
Abstract:
Herein is reported a method for measurement of an analyte in a microparticle-based analyte-specific binding assay, wherein said microparticles are coated with the first partner of a binding pair, the method comprising mixing the coated microparticles, an analyte-specific binding agent conjugated to the second partner of the binding pair, and a sample suspected of comprising or comprising the analyte, wherein said second partner of the binding pair is bound to said analyte-specific binding agent via a linker comprising from 12 to 30 ethylene glycol units (PEG 12 to 30), thereby binding the analyte via the conjugated analyte-specific binding agent to the coated microparticles, separating the microparticles comprising the analyte bound via the binding pair and the analyte-specific binding agent from the mixture and measuring the analyte bound to the microparticles.
Abstract:
There is provided system and a separation substrate device for use with an NLM separator in separating and/or detecting at least one target analyte in a sample, the substrate comprising a micromagnet array of a plurality of micromagnets, the micromagnet array comprising a first capture region, a second focussing region, and, a third detection region, the focussing region comprising a converging and/or diverging micromagnet array region. Also provided is a method for separating and detecting at least one target analyte in a sample. The method including: contacting a plurality of magnetic beads with a sample, the magnetic beads functionalized for binding with one or more target analytes in a sample to form aggregates; providing the sample including magnetic beads and aggregates to a separating substrate comprising a micromagnet array of a plurality of micromagnets; transporting the magnetic beads and aggregates relative to the micromagnet array to provide separation and enable detection of the magnetic beads and aggregates; detecting motion of the beads or aggregates of the sample on the array in response to the applied magnetic field and/or detecting beads or aggregates of the sample on the array at a detection region of the array.
Abstract:
The present invention relates to a biomolecular measurement system (1), which enables to measure the intermolecular forces arising from the interaction between two biomolecules or the intramolecular forces within a single biomolecule by using an atomic force microscope (AFM). In the present invention, the cantilever (2) is moved without using an actuator for moving the cantilever (2). It is moved only when the actuator (4) moves the magnetic nanowire (3) and thus moves the molecule attached to the end of the magnetic nanowire (3). Since the cantilever (2) or a substrate is not moved by another actuator as in the state of the art, fluctuation and disturbance is not created in the liquid containing the biomolecules. Thus, the measurements are made more accurately and with higher resolution. Additionally, by means of the actuator (4), the biomolecules are enabled to be moved upon exertion of magnetic force at any coordinate on x, y and z axes on the nanowire (3), or exertion of torque on two axes.
Abstract:
Methods, systems and programing for substance detection with a magnetic sensor are presented. In one example, a magnetic sensor having one or more layers is formed on a base for sensing a magnetic field created by magnetic particles present in proximity to the magnetic sensor. A first end of each of a first set of strands is immobilized with respect to the magnetic sensor. A magnetic particle is attached to a second end of each of the first set of strands so that when a material containing a substance is in contact with the base, the substance causes at least some of the first set of strands to break resulting in that the magnetic particle attached to the second end of each of the at least some of the first set of strands is no longer in proximity to the magnetic sensor.
Abstract:
The present invention provides a method of separating beads in a fluidic chip comprising an internal fluid circuit through which various reactants, in which at least one of the reactants are beads, may be moved by use of centrifugal force, the method comprises the steps of: providing at least a first set of beads (8a) having a density ml and a second set of beads (8b) having a density m2 in a section (7, 15, 18) of the fluid circuit, the section comprising at least a first outlet (16, 13, 17); providing a first liquid medium in the section, the liquid medium having a density d3, such that ml
Abstract:
Disclosed herein are antibodies having binding specificity to the amino acid sequences Ala Ser Ser Gly Leu Thr Val Glu Val Asp (SEQ ID NO:1 ) and Thr Val Glu Val Asp (SEQ ID NO:14), and methods of detecting cell death in a sample, comprising contacting the sample with a first antibody specific for a C-terminal amino acid sequence Ala Ser Ser Gly Leu Thr Val Glu Val Asp (SEQ ID NO:1 ) or Thr Val Glu Val Asp (SEQ ID NO:14) of a CK18 protein fragment having a C-terminal amino acid sequence of Val Glu Val Asp (SEQ ID NO:2) and a second antibody that specifically binds an epitope that is present in both full-length CK18 and the CK18 protein fragment, and that does not overlap with SEQ ID NO:1 or SEQ ID NO:14, under conditions such that the CK1 8 protein fragment present in the sample specifically binds to the first antibody and the second antibody, wherein one of the antibodies is bound to a solid support and the other antibody is bound to a detection moiety capable of producing a signal; optionally removing any unbound or excess material; and detecting the signal from the detection moiety, wherein the signal is positively correlated with the presence of the CK18 protein fragment in the sample.
Abstract translation:本文公开了对氨基酸序列Ala Ser Ser Gly Leu Thr Val Glu Val Asp(SEQ ID NO:1)和Thr Val Glu Val Asp(SEQ ID NO:14)具有结合特异性的抗体,以及检测细胞死亡的方法 包括使样品与C末端氨基酸序列Ala Ser Ser Gly Leu Thr Val Glu Val Asp(SEQ ID NO:1)或Thr Val Glu Val Asp(SEQ ID NO:14)特异的第一抗体接触, 的具有Val Glu Val Asp(SEQ ID NO:2)的C末端氨基酸序列的CK18蛋白片段和特异性结合存在于全长CK18和CK18蛋白片段中的表位的第二抗体,以及 其不与SEQ ID NO:1或SEQ ID NO:14重叠,使得样品中存在的CK1 8蛋白片段特异性结合第一抗体和第二抗体,其中一种抗体结合于 固体支持物和另一抗体结合到能产生信号的检测部分; 任选地去除任何未结合或多余的材料; 并检测来自检测部分的信号,其中该信号与样品中CK18蛋白片段的存在呈正相关。
Abstract:
Disclosed herein are systems and methods for using the controlled movement of magnetic particles using controlled magnetic fields in a fluidic device containing separated fluidic regions to detect analytes in solution by immunoassay, such as an enzyme-linked immunosorbant assay (ELISA) for various medical and scientific applications. In order to achieve sequential exposure to the different chemical environments required in an immunoassay, magnetic particles are driven through fluid-containing chambers separated by air-gaps that may take the form of air bubbles or small open-air separations, for example. Externally controlled magnets coupled to actuators draw the flow of magnetic particles through air-liquid interfaces produced by microfluidic surface tension at the air-gap, washing the particles.
Abstract:
Methods of electrochemically detecting or quantifying an analyte by coupling a plurality of redox-active agents (e.g., guanine-rich oligonucleotides) to the analyte are disclosed. More particularly, this application discloses affinity-based methods for isolating one or more analytes from a sample and subsequently detecting or determining the concentration of the one or more analytes. Detecting or determining the concentration of one or more analytes may involve measuring the extent of oxidation of guanine nucleobases that have been or are coupled to the analyte.
Abstract:
Devices, systems, and methods for detecting molecules of interest within a collected sample are described herein. In certain embodiments, self-contained sample analysis systems are disclosed, which include a reusable reader component, a disposable cartridge component, and a disposable sample collection component. In some embodiments, the reader component communicates with a remote computing device for the digital transmission of test protocols and test results. In various disclosed embodiments, the systems, components, and methods are configured to identify the presence, absence, and/or quantity of particular nucleic acids, proteins, or other analytes of interest, for example, in order to test for the presence of one or more pathogens or contaminants in a sample.