摘要:
The invention relates to a method and a device (100) for determining the amount of a target component (2) in a sample, wherein magnetic particles (2) can bind to a contact surface (4) with kinetics that depend on the sample-amount of the target component. The method comprises at least two washing steps during which magnetic particles (2) are magnetically moved away from the contact surface (4) and corresponding measurements of the remaining amount of magnetic particles (2) at the contact surface (4). The amount of target component in the sample is estimated from at least one of such measurement results. The measurement allows to determine also high concentrations of target component for which the sensor surface (4) is saturated in a steady-state.
摘要:
The invention relates to a sensor device (100) and a method for the detection of magnetic particles (1) in a sample chamber (2) with a contact surface (11). The sensor device (100) comprises a sensor unit (120, 130) for detecting magnetic particles (1) in a target region (TR) and/or in at least one reference region on the contact surface. Moreover, it comprises a magnetic field generator (140) for generating a magnetic field that shall guide magnetic particles to the contact surface. With the help of these components, an “auxiliary parameter” is determined that is related to the magnetic particles (1) and/or their movement but that is independent of binding processes taking place in the target region between magnetic particles and the contact surface. The auxiliary parameter may for example be related to the degree of mismatch between the positions reached by the magnetic particles (1) under the influence of a magnetic field and the target region (TR). The evaluation results can be used to validate and/or correct the measurements obtained in the target region (TR).
摘要:
The invention relates to a method and a system (100) for selectively processing a sample (130) according to one of a plurality of different assays, for example for detecting a certain target component in the sample. The system comprises a plurality of “specific reagent reservoirs” (120) that contain different sets of reagents, wherein each set is required for one of the assays. Moreover, the system (100) comprises a “universal reagent reservoir” in which reagents for several assays are provided, preferably reagents for all assays. The universal reagent reservoir may preferably be a cartridge (110) in which the processing of a sample (130) can take place and which comprises a plurality of binding sites that are selective for different target components. Depending on the assay to be performed with a sample (130) at hand, the appropriate specific reagent reservoir (121b) is chosen and processed in the universal cartridge (110). This can particularly be done by a manipulator (140) in a high-throughput automated laboratory system.
摘要:
The invention relates to a substance determining apparatus and method for determining a substance within a fluid. Particles attach to the substance and bind to a binding surface (30), wherein a particle release curve being indicative of a release of bound particles from the binding surface (30) is determined, and a part of the particle release curve caused by particles bound to the binding surface via a predefined kind of binding is determined based on the temporal behaviour of the particle release curve. The substance within the fluid is determined based on the part of the particle release curve. The substance can therefore be determined based on particles which are bound to the binding surface via a certain kind of binding, i.e. other kinds of binding substantially do not affect the determination of the substance, thereby improving the accuracy of determining the substance.
摘要:
The present invention relates to a cartridge (1) for the detection of an analyte (2) in a binding assay with magnetic labels (3), the cartridge comprising at least one capture binding agent (4) against a binding site on the analyte and comprising at least two magnetically labelled tracer binding agents (51 and 52) against further different binding sites on the analyte, characterised in that the cartridge comprises at least two regions (61 and 62) wherein a first region (61) comprises the at least one capture binding agent (4) and a first magnetically labelled tracer binding agent (51) and wherein a second region (62) comprises at least one capture binding agent (4) and a second magnetically labelled tracer binding agent (52). Herein the first region (61) does not comprise a magnetically labelled tracer binding agent other than the first magnetically labelled tracer bind agent (51) and wherein the second region (62) does not comprise a magnetically labelled tracer binding agent other than the second magnetically labelled tracer binding agent (52).
摘要:
A method for controlling the movement of magnetic or magnetizable objects (10) in a biosensor cartridge. The method comprises the step of providing a biosensor cartridge with a laterally extending sensor surface (A) and at least a magnetic field generating means (20, 30, 30′) for generating a magnetic field with a field gradient substantially perpendicular to the sensor surface (A). The magnetic field generating means (20, 30, 30′) are alternatingly actuated such that the generated magnetic field directs alternatingly the magnetic or magnetizable objects (10) substantially perpendicular to the sensor surface (A) away and toward the sensor surface, wherein pulse lengths of the alternating actuation are adjusted such that a lateral movement of magnetizable objects along the laterally extending sensor surface is substantially avoided.
摘要:
A method for controlling the movement of magnetic or magnetizable objects (10) in a biosensor cartridge. The method comprises the step of providing a biosensor cartridge with a laterally extending sensor surface (A) and at least a magnetic field generating means (20, 30, 30′) for generating a magnetic field with a field gradient substantially perpendicular to the sensor surface (A). The magnetic field generating means (20, 30, 30′) are alternatingly actuated such that the generated magnetic field directs alternatingly the magnetic or magnetizable objects (10) substantially perpendicular to the sensor surface (A) away and toward the sensor surface, wherein pulse lengths of the alternating actuation are adjusted such that a lateral movement of magnetizable objects along the laterally extending sensor surface is substantially avoided.
摘要:
The present invention relates to a method for measuring Troponin I in a sample comprising the steps of providing a sample, contacting the sample with a monoclonal anti-Troponin I antibody coupled to a magnetic label, contacting the sample with a polyclonal anti-Troponin I antibody coupled to a sensor surface and detecting the magnetic label on the sensor surface. The invention further relates to a device and a cartridge for measuring Troponin I in a sample.
摘要:
The invention relates to a substance determining apparatus (19) for determining a substance within a fluid. A location event determination unit (34) determines location events indicating that a particle, which may have attached the substance, is located in a sensing region and a property of the location events from the sensing signal generated by sensing the sensing region. A location events selection unit (70) selects a part of the location events having a property in a predefined property range, and a substance determination unit (40) determines the substance within the fluid (3) based on the selected part of the location events. This allows tuning the determination of the substance within the fluid to a desired property range, which can relate to a desired kind of bound particles, thereby reducing the influence of unwanted effects on the determination of the substance and, thus, improving the determination accuracy.
摘要:
The present invention is related to a method for detection of a biological target in an affinity assay, the method comprising the steps of providing a biological sample volume containing the biological target, adding a first capturing moiety to the biological sample volume comprising the biological target, wherein the first capturing moiety is adhered to a particle, concentration of the captured biological target into an elution volume that is smaller than the biological sample volume in step a), cleavage of the first capturing moiety or the biological target from the particle and direct or indirect detection and/or quantification of the biological target in a sandwich or competitive affinity assay format, wherein the biological target is associated with at least one capturing moiety, preferably at least two capturing moieties.