Abstract:
Use of isopropanol in aqueous solutions for chromatographic isolation of nucleic acids for enhancing the transfection efficiency of the isolated nucleic acids in prokaryotic and eukaryotic cells.
Abstract:
A process is disclosed for reducing or removing endotoxins from compositions containing therapeutic active substances extracted from natural sources by genetic engineering and/or biotechnology. For that purpose, the compositions are treated with chromatographic materials. The natural sources are disintegrated, the thus obtained fractions are, if required, centrifuged, filtered or treated using affinity chromatography methods, the fractions are pre-incubated in an aqueous salt solution and detergents, are treated with anion exchange materials, then washed with another salt solution. The active substances are eluted from the anion exchanger then further purified in a manner known per se.
Abstract:
The support plate accommodating and being integrally connected with a plurality of adjacent sample containers is disclosed. Each sample container is suitable to accommodate a liquid sample to be separated into components and has an inlet opening and an outlet opening between which a separation layer is arranged. The sample container has a bottom wall in which the outlet opening is located and the outlet opening encloses an outlet spout having an inner diameter in the range of 0.1 to 1 mm and a length in the range of 5 to 20 mm. The ratio between the inner diameter of the outlet spout and its length is in the range of 0.005 to 0.2.
Abstract:
A device (10) for separating liquid samples has a sample container (12), bottom wall (20) of which has an outlet opening (22) provided therein. The outlet opening (22) is joined by an outlet spout (24) extending in the axial direction of the sample container (12). On bottom wall (20) there is a separation layer (28). Below sample container (12), a collecting container (32) is arranged abutting sample container (12) such that an exchange of air between the interior of the collecting chamber (32) and the environment is possible, yet an escape of liquid is largely inhibited. The contact surface between collecting chamber (32) and sample container (12) and end (26) of the outlet spout (24) through which the liquid is discharged, are axially spaced apart.
Abstract:
A method for the separation of long-chain nucleic acids from other substances in solutions containing nucleic acids and other materials, comprising fixing long-chain nucleic acids in a nucleic acid-containing solution onto a porous matrix, washing the porous matrix to separate the other substances from the long-chain nucleic acids, and removing the fixed long-chain nucleic acids from the porous matrix is disclosed. A device for carrying out the method of the claimed invention is also described.
Abstract:
The invention relates to mesenchymal stem cell derived exosomes produced by a method comprising the steps of,
performing a method of producing a clonal mesenchymal stem cell line capable of producing exosomes (MSC-derived extracellular vesicles) comprising the steps of, providing human induced pluripotent stem cells (hiPSCs),
generating therefrom an immortalized clonal cell line of mesenchymal stem cells (IMSCs), characterizing the potential of the IMSCs to produce exosomes,
cultivating the desired IMSCs such that the IMSCs produce exosomes, isolating the exosomes.
Abstract:
There is described is a process for the isolation and purification of nucleic acids such as plasmid or genomic DNA from cells or other sources, wherein a) the cells containing nucleic acids are digested and cell debris is removed, or other samples containing nucleic acids are treated with anion exchangers, namely, in buffer solutions of low ionic strength, b) thereafter, the nucleic acids are desorbed from the anion exchanger using a buffer of high ionic strength, in order to be subsequently c) treated in said buffer of high ionic strength or in the presence of lower alcohols and/or poly(ethylene glycol) with a mineral support material, with adsorption of the nucleic acid to the surface of the mineral support materials, whereupon d) desorption of the nucleic acid is effected using water or a buffer solution of low ionic strength. The device for operating the inventive process consists of a hollow body (1) with an inlet opening (7) and an outlet opening (8), wherein in the hollow body (1), between two securing means (5, 6), a powdered first material based on silica gel (10) is arranged, and a second material (11) is placed between the first material (10) and the outlet opening (8), the first and second materials (10, 11) having different adsorption characteristics for nucleic acids.
Abstract:
A process for the depletion or removal of endotoxins from preparations containing active ingredients designated for therapeutical use which are obtained from natural sources by genetic engineering and/or biotechnology by treatment with chromatographic material wherein said natural source are lysed, the fractions obtained are optionally centrifuged, filtrated or treated with affinity chromatographic methods; said fractions are preincubated with an aqueous salt solution and detergents, treated with anion exchange material and then washed with another salt solution, and the active ingredients are eluted from the anion exchanger, followed by further purification in a per se known manner.
Abstract:
A device and a process for isolating nucleic acids by lysing intact cells and removing nucleic acids emerging from the lysed cells by the following steps:a) the cells are immobilized in a porous matrix, with the size of matrix voids being in the range of the type of cell to be lysed;b) the cells are lysed;c) the nucleic acids are fixated on the matrix surface, and subsequentlyd) are eluted.
Abstract:
A process for the chromatographic separation of nucleic acid using a chromatographic carrier material is described in which the surface of the carrier material is specially modified.