摘要:
Methods and devices for electrochemical detection of a specific binding pair member utilizing a microsphere with an incorporated electroactive marker, wherein a member of the specific binding pair to be detected is bound, directly or through one or more intermediates, to the microsphere. Multiple specific binding pair members may be detected by use of electrochemically distinguishable electroactive markers. Microspheres with incorporated electroactive markers may include one or more functional groups for binding members of specific binding pairs, and are preferably insoluble in aqueous solvents but soluble in selected organic solvents.
摘要:
An aggregate for qualitatively or quantitatively determining bindable substances. Said aggregate comprises an ultra small colloidal particle and a specific binding agent characterized in that the mean diameter of the colloidal particle is below 2 nm. Preferably the size of the metal particle is selected so that the aggregate is capable of penetrating in standard biological specimens. The invention further provides a universally applicable detection system for determining bindable substances in particular in living material. Further there is provided a process for preparing said aggregate.
摘要:
A simple, cost effective assay of iron is accomplished by using lactoferrin as part of a biosensor to detect iron in a sample. The lactoferrin releases protons when the iron is sequestered by the lactoferrin and the change in potential caused by the release of protons is measured by a potentiometer or pH sensing device. The sensing devices include the ion-selective or ion sensitive field effect transistors (ISFET), a potentiometric device or the pH indicator papers.
摘要:
A Raman label which, upon radiation, produces a detectable Raman scattering signal in a ligand-binding assay for an analyte in a test sample. A conjugate containing a Raman label attached to a specific binding member.
摘要:
The present invention relates to improved specific binding assay methods, kits and devices utilizing chromatographically mobile specific binding reagents labelled with colloidal particles. Specific binding reagents labelled with colloidal particles such as gold and selenium may be subjected to rapid chromatographic solvent transport on chromatographic media by means of selected solvents and chromatographic transport facilitating agents. Further, impregnation of solid substrate materials with labile protein materials including colloidal particle and enzyme labelled reagents in the presence of meta-soluble proteins provides for the rapid resolubilization of such materials which have been dried onto such substrate materials.
摘要:
The present invention relates to a new technique and device for mass transfer of one or more components from one liquid phase to another liquid phase, involving a physical separation of said two phases.According to the new technique, the mass transfer and physical separation are carried out in the same device. The device consists of a mixing-reservoir into which is fitted snugly a mixer-separator, having a channel in the vertical axis of the mixer-separator. The two substantially immiscible liquid solutions are introduced into the mixing reservoir, the phases are thoroughly mixed, by moving the mixer-separator in and out the mixing reservoir. After the spontaneous separation into an upper and lower phase, the upper phase is removed by pushing in the mixer-separator said upper phase being accumulated in a collecting container.The new technique and device can be successfully utilized in the general field of liquid-liquid extraction and particularly applied in immunoassays, where the two basic operations of mass transfer and physical separation of fractions are required.
摘要:
A test pack kit for assaying for a ligand in a liquid medium. The kit comprises specially designed assay tubes, each tube having a cylindrical side arm which can be interconnected with the side arm of another assay tube. In addition, the pack kit contains antiserum; a conjugate of a metal labelling substance with the ligand; assay calibration standards--in vials containing known concentrations of unlabelled ligand; a separation agent in vials containing material used for separating the bound antibody--metal labelling complex from the unbound metal labelling substance and instrument calibration standards--in vials containing several known concentrations of the metal--labelling substance. Errors caused by pipetting or transferring of reagents from one container to another are practically eliminated.
摘要:
A method and apparatus for conducting chemical reactions at a liquid-solid interface wherein a reaction component is fixed on the surface of a solid phase immersed in a liquid phase containing a freely diffusing, mobile reaction component. The apparatus comprises a substantially smooth-surfaced matrix of appropriate geometrical configuration designed to provide a large surface to volume ratio, a short transfer distance from the mobile component to the fixed component distributed on the solid phase surface and to drain freely upon removal from the reaction liquid.
摘要:
An indirect method for the quantitation of an antigen or antibody in a liquid sample. In the antigen assay, antigen of the same type as the sample antigen is adsorbed onto a solid support surface. Then, specific labelled antibody is immunologically reacted in solution with the sample antigen and the adsorbed antigen. The quantity of reacted labelled antibody on the solid support surface is then determined, as for example, fluorogen label by a fluorometer. The procedure is employed for detection of antibody by reversing the antigen and antibody components in each instance.