Abstract:
Methods and devices for isolating nucleic acids from a mixture containing such nucleic acids and extraneous matter are provided. In one embodiment, the method of the invention comprises passing the mixture through a glass frit under conditions effective to separate the nucleic acids from the extraneous matter. In a more specific embodiment, the glass frit is a sintered glass frit.
Abstract:
Methods and devices for isolating nucleic acids from a mixture containing such nucleic acids and extraneous matter are provided. In one embodiment, the method of the invention comprises passing the mixture through a glass frit under conditions effective to separate the nucleic acids from the extraneous matter. In a more specific embodiment, the glass frit is a sintered glass frit.
Abstract:
A device and method for permitting the separation of plasma or serum from whole blood. The device comprises a matrix of hydrophilic sintered porous material to which at least one red blood cell agglutinating agent has been applied. According to a first method of using the device, a sample of whole blood is applied to a first end of the matrix and the red blood cells within the sample come in contact with the agglutinating agents present in the matrix. The blood cells agglutinate, and are entrapped in the interstices of the matrix, while substantially blood-cell-free serum or plasma accumulates near the outlet of the device. A filter means in liquid receiving relationship with the matrix functions to wick the serum or plasma from the matrix. According to an alternative aspect of the invention, a filter means in liquid receiving relationship with the outlet of the matrix functions to retain any blood cells which pass through the matrix as the filter means wicks the plasma or serum from the matrix. Additional agglutinating agents may be incorporated within the filter means to facilitate retention of blood cells which pass through the matrix. Another aspect of the present invention involves a device for the measurement of a serum or plasma sample, utilizing a matrix of sintered porous material, such as sintered glass, sintered steel, sintered ceramics, sintered plastics, and eguivalents thereof. The matrix is characterized by a reproducible fluid uptake capacity proportional to the fixed dimensions of said matrix, a minimal reactivity with plasma or serum components, and a hydrophilic internal surface which enables the matrix to collect and retain a predetermined volume of sample for analysis. A further aspect of the present invention provides a porous reagent delivery system comprising a matrix of sintered porous material containing at least one reagent in a freeze-dried state, and method for making same. The system allows the delivery of a unitized form of a freeze-dried reagent which is recoverable upon contact with a liquid.
Abstract:
1. Verfahren zur Herstellung von offenporigen Sinterkörpern aus Glas mit großem offenen Porenvolumen, das besonders geeignet ist als Filter für Flüssigkeiten und Gase bei hohen Durchflußgeschwindigkeiten. 2.1. Offenporiges Sinterglas wird nach herkömmlichen Verfahren hergestellt, wobei sich jedoch bei Porenvolumina von mehr als 60 % Biegezugfestigkeiten ergeben, die für eine Anwendung als Filtermedium zu niedrig sind. Ungüstig für die Filtration ist weiterhin die breite Verteilung der Porengröße sowie die Strukturierung der inneren Oberfläche der Poren. Das neue Verfahren soll offenporiges Sinterglas mit großen offenen Porenvolumen, hohen Biegezugfestigkeiten und guten Durchflußgeschwindigkeiten liefern. 2.2. Bei diesem Verfahren wird zunächst ein Ausgangsgranulat aus feinkörnigem Glaspulver, grobkörnigem Salzpulver und Bindemittel hergestellt. Diesem Ausgangsgranulat wird dann 5 bis 20 Gew.-% feinkörniges Glaspulver zugesetzt und diese Masse einer Formgebung unterzogen. Anschließend wird der so entstandene Formkörper auf die Sintertemperatur des Glases erhitzt und versintert und danach wird das Salz aus dem Sinterglas herausgewaschen. 2.3. Herstellung von offenporigem Sinterglas für Filter.
Abstract:
Air filtration media and methods of processing the same are described herein. One method of processing an air filtration medium includes mixing an adsorption material, a polymer material, and a reinforcement material, compressing the mixture, and heating the mixture.
Abstract:
A sample preparation device is disclosed. The sample preparation device includes a housing defining a passage way between a first opening and a second opening; and a sample filter occupying a section of said passage way. The sample filter contains a monolith adsorbent that specifically binds to nucleic acids. Also disclosed are sample filters containing glass frit is coated with an capture agent that binds specifically to an analyte of interest, sample filters containing a hydrophilic matrix with impregnated chemicals that lyses cell membranes, a cartridge base and an integrated sample preparation cartridge.