Abstract: The present disclosure provides “all-in-one” cartridges which contain necessary reagents and materials to isolate/preconcentrate targeted proteins from blood plasma and ionize them for mass spectrometry detection. In another configuration, the cartridges include proteolytic enzymes to digest the proteins into smaller peptides in addition to preconcentration and ionization for mass spectrometry detection.

Abstract: This disclosure relates to mesofluidic devices and methods for eluting and concentrating a plurality of nucleic acid molecules. The mesofluidic device includes a device frame having a bottom surface upon which is defined a first reservoir and the second reservoir. The first reservoir includes a first electrode, and the second reservoir includes a second electrode. The first and second electrodes are configured for electrical connection. The mesofluidic device includes an elongated channel extending between the first reservoir and the second reservoir. The mesofluidic device includes a first slot having a first slot width. The first slot is configured to receive an insert. The first slot intersects the elongated channel. The mesofluidic device includes a second slot having a second slot width. The second slot is configured to receive a separation material having a first porosity. The second slot intersects the elongated channel.

Abstract: A method of collecting one or more target macromolecules in a capture membrane by gel electrophoresis is disclosed, as well as a kit for macromolecule isolation and recovery including: a preformed gel; a capture device; an insertion guide; and optionally, a migration gauge.

Abstract: An air quality test unit for attachment to a vent of a HVAC system with air flow there through. The air quality test unit is a closeable collection container is used with only one substrate panel. The substrate panel with the collection container has one or more ball and socket pivot hinges coupling the substrate panel to the clip. The air quality test unit is attachable to the vent by the clip. The collection container of the substrate panels capture airborne substances and contaminants emanating from the air flow of the HVAC system vent and is then closed with a detachable cover. A culture growth medium may be disposed in the collection container. The air quality test unit kit provides a user with an air quality test unit and process for shipping the unit to the laboratory for analysis.

Abstract: An air quality test unit for attachment to a vent of a HVAC system with air flow there through. The air quality test unit contains at least two substrate panels arranged in a v-shape form wherein at least one panel includes a sticky surface or a collection container. The air quality test unit is attachable to the vent by one or more clips. The sticky surfaces or collection container of the substrate panels capture airborne substances and contaminants emanating from the air flow of the HVAC system vent. A culture growth medium may be disposed in the collection container or on the sticky surface. The air quality test unit kit provides a user with an air quality test unit and process for shipping the unit to the laboratory for analysis.

Abstract: An improved staining method and system is described for staining a biopolymer such as a peptide, a protein, an RNA, a DNA, an oligosaccharide or a complex containing a peptide, a protein, an RNA, a DNA, or an oligosaccharide in a matrix. The method includes the step of moving a staining reagent into the matrix using an electric force. The staining time can be dramatically reduced relative to conventional technologies. The improved staining method can particularly be used, for example, to stain proteins after gel separation. Other related methods, related kits and related systems for carrying out the staining method are also described.

Abstract: An air quality test unit for attachment to a vent of a HVAC system with air flow there through. The air quality test unit contains at least two substrate panels arranged in a v-shape form wherein at least one panel includes a sticky surface or a collection container. The air quality test unit is attachable to the vent by one or more clips. The sticky surfaces or collection container of the substrate panels capture airborne substances and contaminants emanating from the air flow of the HVAC system vent. A culture growth medium may be disposed in the collection container or on the sticky surface. The air quality test unit kit provides a user with an air quality test unit and process for shipping the unit to the laboratory for analysis.

Abstract: A culture flask comprising a culture chamber in a flask body comprising an even bottom wall with a growth surface on the top side, an even cover wall at a section from the bottom wall, and side walls that bridge the distance between the margins of the bottom wall and cover wall, an opening that is in adjacent regions of a side wall and the even cover wall at a distance from the bottom wall, and a hollow cylindrical flask neck that is connected to the margin of the opening and is aligned at a sharp angle to the growth surface so that the serological pipette, a scraper, a cannula or another elongated device for adding or removing material can be placed on the rear corners of the growth surface from the outside through the flask neck.

Abstract: The disclosure provides methods and kits for diagnosing the nutritional state of selenium, using six proteins as biomarkers for which the expression increases when the metabolic state is supra-nutritional.

Abstract: Particles may be injected into a matrix for concentration by scodaphoresis using a quadrupole injection field. Particles may be injected from two or more sample chambers simultaneously. Particle injection may be performed simultaneously with performing scodaphoresis. In some embodiments the particles are concentrated into a well containing fluid. The well can extend out of a plane of the matrix. Altering the relative phases of components of a scodaphoresis field permits concentration of selected particles and exclusion of other particles. Scodaphoresis methods may be applied to DNA, other bio-molecules and other particles.

Abstract: To provide a system by which evaluation of circumstances of contamination by microparticles having nucleic acid can be performed rapidly and accurately. The theme is achieved by a system for measuring microparticles that includes: (1) a microparticle adhesion step of adhering the microparticles having nucleic acid to a microparticle adhesion member; (2) a membrane breakage step of breaking membranes of the adhered microparticles by electrical discharge; (3) an electrophoresis step of electrophoresing the microparticles in a thickness direction of a gel to make the nucleic acid in the microparticles migrate from a negative electrode side toward a positive electrode side and adhere the nucleic acid on a surface of a nucleic acid detection member; and (4) a nucleic acid measurement step of fluorescently staining the surface of the nucleic acid detection member to measure a concentration of the nucleic acid.

Abstract: Gels, such as polyacrylamide gels, are provided that include linear polyacrylamide in the stacking gel. Native gels that include linear polyacrylamide in the stacker can be used to separate biomolecular complexes, such as protein complexes. Gel cassettes in which the gap width between front and back plates does not vary by more than 5% at the upper edge of the cassette are also provided. The gel cassettes can be used for electrophoretic separation of proteins and protein complexes on native gels, such as native gels that include linear polyacrylamide in the stacker. The native gels can have multiple wells for electrophoresing at least one sample and/or at least one molecular weight standard.

Abstract: The invention provides an electroblotting system for blotting gels, in which the system includes an electroblotting transfer stack that comprises an analysis gel and a blotting membrane, an anode, an ion source juxtaposed with the anode between the anode and the transfer stack, a cathode, and another ion source juxtaposed with the cathode between the cathode and the transfer stack, in which the each ion source is sufficient for electrophoretic transfer. The anode, the cathode, or both can be separate from a power supply and provided as part of a disposable electrode assembly that also includes a body of gel matrix that includes ions for electrophoretic transfer.

Abstract: Particles may be injected into a matrix for concentration by scodaphoresis using a quadrupole injection field. Particles may be injected from two or more sample chambers simultaneously. Particle injection may be performed simultaneously with performing scodaphoresis. In some embodiments the particles are concentrated into a well containing fluid. The well can extend out of a plane of the matrix. Altering the relative phases of components of a scodaphoresis field permits concentration of selected particles and exclusion of other particles. Scodaphoresis methods may be applied to DNA, other bio-molecules and other particles.

Abstract: Methods and apparatus for separating, concentrating and/or detecting particles are disclosed. The particles are enriched within a separation medium by binding to an immobilized affinity agent. Contaminants and/or undesired particles are washed off the separation medium. The affinity agent is mobilized or the interaction between the particles and the immobilized affinity agent is disrupted. SCODA fields are applied within the medium to separate, concentrate and/or detect a target particle.

Abstract: An electroblotting cassette is formed in three separable parts—an upper plate, a lower plate, and a base that receives both plates, with electrodes mounted on both the upper and lower plates. The cassette accommodates transfer stacks of different thicknesses by its inclusion of a set of raised areas, known as “lands,” on the floor of the base and a set of inverse lands on the underside of the lower electrode plate, the two sets being spatially arranged to either abut each other or be offset from each other, depending on the orientation of the lower plate, thereby allowing the user a choice between two heights of the lower plate within the base and hence two thicknesses of transfer stacks. Other arrangements include those with more than one set of lands on one or both parts to allow for three or more thickness selections, or depressions in place of lands. Finger-operated latches secure the upper plate to the base.

Abstract: A gel extraction device (10) comprises a hollow cutting member (12) having cutting edge (14) at one end and a squeeze bulb (16) at the other end. In a further embodiment, the air passage between the cutting edge and the bulb has a constriction zone (20) to prevent any extracted gel from being drawn too deeply into the extractor, in another embodiment, a blow-hole in the hollow cutting member or in the squeeze bulb provides for the passage of air displaced by gel through the extractor. The blow-hole may be covered to secure the gel in the receptacle for transfer from the matrix to a sample container.

Abstract: The invention can be used to purify and extract a target oligonucleotide from a gel substrate. The current invention extracts the target oligonucleotide so quickly that burn-off against the positive electrode is greatly reduced, yielding high optical density and purity. The need for an osmotic membrane or heavy salt/light salt barrier to capture the oligonucleotide is eliminated. The invention does not require a high salt concentration and therefore does not require a desalting column that is time-consuming and reduces yield.

Abstract: The present invention relates to an electrophoresis apparatus comprising a gel chamber for receiving electrophoresis medium, a removable gel system, which is arranged in the gel chamber, having a separation gel for the electrophoretic separation of biological molecules such as nucleic acids or proteins, electric contact elements for generating an electric field through the separation gel, optionally a lid for fastening on the gel chamber, characterized in that the separation gel is delimited at least at one side by a spacer element which is in the form of a collector and comprises a plurality of sample collection containers, which are arranged one next to the other, for fractionating and for collecting the electrophoretically separated molecules. The invention further relates to a method for the electrophoretic separation and collection of biological molecules by way of a two-dimensional gel electrophoresis.

Abstract: A device for separating and purifying useful quantities of particles comprises: (a) an anolyte reservoir connected to an anode, the anolyte reservoir containing an electrophoresis buffer; (b) a catholyte reservoir connected to a cathode, the catholyte reservoir also containing the electrophoresis buffer; (c) a power supply connected to the anode and to the cathode; (d) a column having a first end inserted into the anolyte reservoir, a second end inserted into the catholyte reservoir, and containing a separation medium; (e) a light source; (f) a first optical fiber having a first fiber end inserted into the separation medium, and having a second fiber end connected to the light source; (g) a photo detector; (h) a second optical fiber having a third fiber end inserted into the separation medium, and having a fourth fiber end connected to the photo detector; and (i) an ion-exchange membrane in the anolyte reservoir.

Abstract: A process for making a support for an electrophoretic medium comprising the steps of: applying an agarose coating to a corona treated polymeric film by transferring a layer of agarose solution onto a surface of the corona treated polymeric film. The pH of the agarose solution can be generally maintained between about 8 and about 11 and the concentration of the agarose solution can be generally maintained between about 0.1 and about 0.4% agarose by weight. The agarose powder used to make the agarose solution can be pre-treated by introducing a fresh reducing atmosphere above the agarose powder and exposing the agarose powder to a reducing atmosphere. The reducing atmosphere treatment may be repeated at least three times.

Abstract: Disclosed are methods and devices for electrophoretic separation of free biomolecules from molecular complexes comprising biomolecules of interest during which inhomogeneity in the molecular complexes is masked. The methods can include loading a sample which contains free biomolecules and the complexes that include biomolecules of interest to a proximal end of an electrophoresis gel. The sample is electrophoresed for a period of time sufficient for the free biomolecules to elute off a distal end of the gel while the molecular complexes that include the biomolecules of interest are retained in the electrophoresis gel, thereby separating the molecular complexes from the free biomolecules. The direction of electrophoresis is reversed and the sample is electrophoresed for a period of time sufficient for the molecular complexes of bound biomolecules of interest to elute from the proximal end of the electrophoresis gel.

Abstract: The present invention is to provide a method for obtaining an oligonucleotide such as RNA aptamer having high binding capacity to a target substance with easy-to-use and high purity. The method for obtaining oligonucleotide according to the present invention is as follows: A method for obtaining oligonucleotide comprising the steps of: performing an electrophoresis of a nucleic acid molecule/target substance complex comprising a nucleic acid molecule and a target substance; recovering said nucleic acid molecule/target substance complex; extracting the nucleic acid molecule from said nucleic acid molecule/target substance complex; gene amplifying said nucleic acid molecule.

Abstract: A method for silver staining a gel on which biological substances such as nucleic acids and proteins are separated by electrophoresis, which comprises at least the following steps: (a) the step of immersing an untreated gel after the electrophoresis in an aqueous solution of sodium thiosulfate; (b) the step of immersing the gel obtained in the step (a) in a mixture of ethanol and an aqueous solution of sodium acetate; and (c) the step of immersing the gel obtained in the step (b) in a mixture of ethanol and an aqueous solution of silver nitrate.

Abstract: In labeling a cell, and separating and collecting the cell according to a degree of the labeling using a cell separator, effects on the cell is minimized and the use of the collected cell is facilitated, thereby, when labeling a cell, the cell is labeled in the state where interaction of each cell is retained. In the labeling, a specific labeling material present on a surface of a target cell is taken in the cell via a transporter, and the cell is dispersed one by one to separate the same with a cell separator. Immediately after the separation, the cell is put in a solution not containing the specific labeling substance to remove the specific labeling substance taken in the cell. This series of steps is continuously conducted with a cell separation chip.

Abstract: A gel electroelution device can have a gel spot column having upstream and downstream openings in fluid communication with an inlet and outlet, respectively. The gel spot column receives a gel spot and negative and positive electrodes are fluid communication with the inlet and outlet, respectively. A gel electroelution process can involve flowing a buffer solution through the gel spot in a first direction, and creating an electric field across the gel spot in the same direction. A separator device can have a generally cylindrical collection reservoir in fluid communication with inlet, filtrate, and retentate ports, a filter intermediate the inlet and filtrate ports. The inlet and retentate ports can intersect the collection reservoir in a manner to induce a cyclonic flow. A flow separation process can involve inducing a generally cyclonic flow in the collection reservoir, and filtering the fluid therein to retain the retentate.

Abstract: The invention provides an apparatus for producing an image of a global surface of an ion source sample plate that is exterior to an ion source. In general terms, the apparatus contains a sample plate for an ion source, an imaging device (e.g., a CCD or CMOS camera) and an illumination device that is configured to produce a light beam that contacts the sample plate surface to define a grazing angle between the light beam and the sample plate surface. The apparatus may be present at a location that is remote to the ion source.

Abstract: The invention relates to a device and a method for automatically analysing the constituents of at least one analyte, especially by means of gel electrophoresis and/or isoelectric focussing, comprising at least one separating matrix, especially a gel. Each separating matrix is applied on at least one side in a supporting direction S of a supporting element, can be loaded with an analyte, and can be electrically contacted on opposite ends in a separating direction T in order to split the analyte into its constituents.

Abstract: The excision of sample spots from a gel or membrane by pressing a cutting tool terminating in a hollow cylinder against the gel or membrane supported on a rigid surface is made more reliable by interposing a relatively pliable, intermediate layer on the side of the surface facing the gel or membrane. The pliability of the intermediate layer compensates for any irregularity or misalignment of the cutting edge of the cylinder relative to the gel or membrane.

Abstract: An apparatus and method for the sequential electroelution of biomolecules is described, the apparatus comprising a separation medium having an outlet, and a collector having at least a first receptacle and a second receptacle that can be sequentially brought into contact with the outlet of the separation medium by translating the first receptacle and the second receptacle in relation to the outlet of the separation medium, and the method comprising the steps of receiving a first substantially separated molecule in the first receptacle and translating the first receptacle and the second receptacle such that the second receptacle is brought into in contact with the outlet of the separation medium, receiving a second substantially separated molecule in the second receptacle, and repeating said steps to sequentially receive a desired number of substantially separated molecules.

Abstract: A gel electrophoresis cassette (33) is disclosed which includes two plates (34, 35) and at least one seal (36) which separates these plates. The seal (36) is annular; it may be positioned essentially in the region of the outer edge of the plates (34, 35). For performing an electrophoresis in a second dimension following an isoelectric focusing in an first dimension, one of the plates (34, 35) includes a recess (37) for inserting a strip holder (1) having a base plate (4), which has a carrier surface (2) on which an IEF strip (3) is accommodated. The base plate (4) includes at least one stop (5) offset to a lower level in relation to the carrier surface (2) and a sealing surface (6). The strip holder (1) is insertable into this recess (37) in such a way that the stop (5) of the base plate (4) is applied to the outer surface of the plate (34, 35) and the sealing surface (6) presses tightly against the inner surface (38) of the recess (37).

Abstract: The present invention relates to a gel sheet (1) for use in a spot picker device wherein said gel sheet is provide with reference marks (5?–5??) which can be used to determine if the gel sheet (1) has been deformed between the stages of scanning the gel sheet and picking spots out of the gel sheet (1). The present invention also relates to a method of picking spots using such a gel sheet (1) and reference marks for use with the method.

Abstract: The present invention relates a method of electrophoretic separation of protein and/or peptide components of a sample in a convection stabilized medium. More specifically, the method comprises the steps to contact the sample with the separation medium; to apply a voltage across said medium; and to observe the results by analysis of one or more sections of the separation medium. In the present method, a disulphide-comprising compound is added before or during the procedure to make an excess of reactive disulphide groups accessible to react with the cysteine groups of the proteins and/or peptides all through the separation procedure. The present invention also relates to electrophoretic separation media that comprises reactive disulphide groups, such as polyacrylamide gels, and the use of a solution that comprises reactive disulphide groups to pretreat an electrophoretic separation medium.

Abstract: A strip holder (1) is disclosed for accommodating a gel strip (3) for separating molecules using gel electrophoresis. The strip holder (1) disclosed is distinguished by including a baseplate (4), at least one stop (5), which is offset to a lower level in relation to the carrier surface (2), and at least one sealing surface (6), this stop (5) being implemented to be applied to counter surfaces (7) of an electrophoresis chamber, through which offset to a lower level of the stop (5) the installation depth of the strip holder (1) carrying a gel strip (3) into this electrophoresis chamber is determined and the sealing surface (6) ensuring a sealing installation of the strip holder (1) carrying a gel strip (3) into this electrophoresis chamber. Such a chamber (15) for isoelectric focusing of molecules in gel strips (3) is distinguished by including such a strip holder (1), a frame (16), and a cover (20).

Abstract: The invention relates to an apparatus for performing gel protein extractions and methods of using the apparatus.

Abstract: A preparative electrophoresis apparatus suitable for recovery of molecules from gels comprises two spaced apart electrode compartments connected by a conduit that descends from the bottom of the electrode compartments in a V-shaped or U-shaped form. The conduit serves as a reservoir for collecting electroeluted molecules. Two electrophoresis buffers are used, a first one of a low concentration and density, and a second one of a high concentration and density. The electrode compartments are filled with the first electrophoresis buffer solution while the conduit is filled with the second electrophoresis buffer solution. Under the influence of an electric field, the molecules exit the gel and concentrate in the high concentration buffer. After a certain time, usually a time that is sufficient for driving substantially all desired molecules out of the gel, the electric field is switched off. The high concentration buffer containing the electroeluted molecules is withdrawn from the conduit.

Abstract: A sample taking apparatus comprises a plurality of separation tools (10) (for example, punching capillaries) on a holding device (20), wherein the separation tools (10) are each provided with actuating means (30) for separate control thereof. In a sample taking method (for example, for punching samples from separation gels), successively removed samples are deposited in parallel onto a target substrate.

Abstract: An apparatus and method for mincing a gel includes a gel mincing tube and a mesh material. The mesh material extends across the end of the tube. To subdivide a gel using the mincing apparatus, a gel is placed upon the mesh material in the mincing tube, the mincing tube, mesh material and the gel are spun in a centrifuge, forcing the gel through the mesh material so that the gel is subdivided into generally uniform smaller fragments. The mesh material may be secured to a tube in the form of a nesting tube. The nesting tube nests within the opening of a recovery vessel. The mesh material may be placed in series with a conditionally porous membrane in the nesting tube. Centrifuging the nesting tube and the recovery vessel subdivides gel material into fragments by forcing the gel through the mesh material. The gel subsequently falls upon the membrane, and may be treated on the membrane to extract or otherwise treat analytes in the gel material.

Abstract: An automatic sample collection system for use with an electrophoretic slab gel system is presented. The collection system can be used with a slab gel have one or more lanes. A detector is used to detect particle bands on the slab gel within a detection zone. Such detectors may use a laser to excite fluorescently labeled particles. The fluorescent light emitted from the excited particles is transmitted to low-level light detection electronics. Upon the detection of a particle of interest within the detection zone, a syringe pump is activated, sending a stream of buffer solution across the lane of the slab gel. The buffer solution collects the sample of interest and carries it through a collection port into a sample collection vial.

Abstract: A preparative electrophoresis apparatus suitable for recovery of molecules from gels comprises two spaced apart electrode compartments connected by a conduit that descends from the bottom of the electrode compartments in a V-shaped or U-shaped form. The conduit serves as a reservoir for collecting electroeluted molecules. Two electrophoresis buffers are used, a first one of a low concentration and density, and a second one of a high concentration and density. The electrode compartments are filled with the first electrophoresis buffer solution while the conduit is filled with the second electrophoresis buffer solution. Under the influence of an electric field, the molecules exit the gel and concentrate in the high concentration buffer. After a certain time, usually a time that is sufficient for driving substantially all desired molecules out of the gel, the electric field is switched off. The high concentration buffer containing the electroeluted molecules is withdrawn from the conduit.

Abstract: Gellan can be purified from nucleic acid contamination by combining the contaminated gellan with DNase under conditions that allow the DNase to degrade the nucleic acid contaminant. The purified gellan is useful in gel electrophoresis. A buffer which allows cystamine to be used as a reversible cross-linker does not have to be recirculated during the course of a normal gel run.

Abstract: An apparatus for expressing and unloading an isoelectric focusing gel from an electrophoresis gel tube includes a first support for supporting the gel tube, a plunger rod and a second support for supporting the plunger rod. The first support is mounted on a movable carriage and is moved toward the second support so that the gel tube slides onto the plunger rod to unload the gel from the gel tube. A plurality of gel tubes can be mounted in a rack and the rack coupled to the first support. The first support preferably includes a plurality of openings oriented with the gel tubes for guiding a respective plunger rod through the axial passage of the gel tubes. In preferred embodiments, the second support supporting the plunger rods is substantially stationary while the first support moves toward the second support so that the gel tubes slide onto the plunger rods.

Abstract: An apparatus and method for mincing a gel includes a gel mincing tube and a mesh material. The mesh material extends across the end of the tube. To subdivide a gel using the mincing apparatus, a gel is placed upon the mesh material in the mincing tube, the mincing tube, mesh material and the gel are spun in a centrifuge, forcing the gel through the mesh material so that the gel is subdivided into generally uniform smaller fragments. The mesh material may be secured to a tube in the form of a nesting tube. The nesting tube nests within the opening of a recovery vessel. The mesh material may be placed in series with a conditionally porous membrane in the nesting tube. Centrifuging the nesting tube and the recovery vessel subdivides gel material into fragments by forcing the gel through the mesh material. The gel subsequently falls upon the membrane, and may be treated on the membrane to extract or otherwise treat analytes in the gel material.

Abstract: The present invention relates to methods for separating nucleic acids from other cellular debris, especially substances that carry a net positive charge at low pH, by electrophoresis under acid conditions. In the purification method of the present invention, nucleic acids are separated from proteins found in the same biological sample by applying the sample to an electrophesis gel and subjecting the sample to electrophoresis under acid conditions to separate the nucleic acids from the proteins. The optimum pH may differ for different sample types but can be readily determined by those skilled in the art. Preferably, the separation is performed at a pH of about 2 to about 4. More preferably, electrophoresis is carried out at a pH of 2.

Abstract: An automated high-throughput system for excising spots or samples from an electrophoresis slab gel includes a computer controlled robotic arm assembly and a sample plate handling assembly for supplying a sample plate to a loading station. The computer is connected to a scanner and imaging device to identify selected sample locations on the slab gel and to direct the robotic arm to the selected locations for excising the gel spots. The cutting assembly includes a removable tray for supporting the slab gel during the cutting process and is coupled to the automated sample plate handling assembly. The sample plate handling assembly delivers a multiwell plate to the cutting assembly for receiving the gel spots. The removable tray cooperates with a scanner for identifying protein spots and includes a positioning device to position the tray in the scanner and the cutting assembly in selected locations to coordinate the scanned image with the cutting process.

Abstract: Polypeptides which have been separated by gel electrophoresis can be identified by electroblotting them through a “sandwich” comprising in order: a) the separation gel; b) at least one hydrophilic membrane, e.g. of carboxyl-modified PVDF, on which is immobilized at least one reagent capable of cleaving a polypeptide, e.g. trypsin; c) a hydrophobic layer, typically a membrane, e.g. of PVDF. Preferably a biased alternating current or discontinuous direct current is used for electroblotting. The resulting fragments, usually peptides, are identified, preferably by MALDI-TOF MS.

Abstract: A method is disclosed for the detection of a His-tagged target biomolecule while said molecule remains in the gel in which it has been separated from other constituents by electrophoresis. The method involves, while the separated His-tagged biomolecule remains in the gel, forming a chelate between the His-tagged molecule, a lanthanide metal ion which exhibits fluorescence, and a sensitizer which enhances the fluorescence of the ion. The gel is then exposed to a u.v. light source to thereby generate a fluorogenic signal indicating the presence of the chelate and, in turn, the His-tagged biomolecule. The fluorogenic signal can then be detected either by direct visualization and/or by other means, such as photographically, e.g., film or charged coupled device (CCD) imaging.

Abstract: The present invention is drawn to a method for de-staining a substrate that is stained with a dye by bringing the substrate into contact with a de-staining composition and absorbing the dye from the substrate with the de-staining composition, wherein the de-staining composition is a charcoal or ion-exchange resin absorbent incorporated in a semi-solid matrix which is a polyacrylamide or agar gel. With the method of the invention a stained substrate may be stained and de-stained in a single step. The present invention is further drawn to an apparatus for performing the method of de-staining the substrate.

Abstract: An alignment plate is provided with a plurality of holes for guiding a pipette tip toward a sample plate of a MALDI mass spectrometer. Each of the holes is provided with a conical upper contour in order to guide the pipette tip toward a specific location on the sample plate. Two companion alignment plates are used in order to overlay two separate arrays of samples on the sample plate. For instance, a first of two alignment plates is formed with a 10×10 array of holes so that a 10×10 array of samples is deposited by the pipette tip onto the sample plate. The second of the two alignment plates is formed with a 9×9 array of holes so that a 9×9 array of samples is deposited on the sample plate at locations offset from the 10×10 array of samples already on the sample plate. The number of samples loaded on the sample plate is large and the space on the sample plate is more fully utilized.

Abstract: A method is disclosed for the detection of a His-tagged target biomolecule while said molecule remains in the gel in which it has been separated from other constituents by electrophoresis. The method involves, while the separated His-tagged biomolecule remains in the gel, forming a chelate between the His-tagged molecule, a lanthanide metal ion which exhibits fluorescence, and a sensitizer which enhances the fluorescence of the ion. The gel is then exposed to a u.v. light source to thereby generate a fluorogenic signal indicating the presence of the chelate and, in turn, the His-tagged biomolecule. The fluorogenic signal can then be detected either by direct visualization and/or by other means, such as photographically, e.g., film or charged coupled device (CCD) imaging.