Abstract: The present invention provides method for isolating DNA molecules having a size above a certain cut-off value from a DNA containing sample, comprising a) contacting the sample with a binding buffer which comprises a chaotropic agent and a buffering agent to provide a binding mixture and binding DNA molecules having a size above the cut-off value to a binding matrix which has a silicon containing surface, wherein the cut-off value is determined by the pH value of the binding mixture; b) separating the bound DNA from the remaining sample; c) optionally washing the bound DNA; and d) optionally eluting the bound DNA from the binding matrix. Said method allows the size selective purification of DNA molecules.

Abstract: The present invention refers to a device, comprising a hollow body having at least one open end and at least one barrier inside or at the end of the hollow body, which is non-permeable for liquids and solids under ambience conditions, however, becomes liquid-permeable by applying an external force like pressure, drag force or driving power to said barrier, the use of such a device for collection, storage, treatment or isolation of a biomolecule or biomolecules containing samples, a method for preparation of said device and a method for isolation or purification of any biomolecules using said device.

Abstract: The present invention provides method for isolating DNA molecules having a size above a certain cut-off value from a DNA containing sample, comprising a) contacting the sample with a binding buffer which comprises a chaotropic agent and a buffering agent to provide a binding mixture and binding DNA molecules having a size above the cut-off value to a binding matrix which has a silicon containing surface, wherein the cut-off value is determined by the pH value of the binding mixture; b) separating the bound DNA from the remaining sample; c) optionally washing the bound DNA; and d) optionally eluting the bound DNA from the binding matrix. Said method allows the size selective purification of DNA molecules.

Abstract: The present invention relates to a device for rapid isolation of target molecules from cell lysates and other liquid mixtures comprising particulate material, a method for isolating the target molecules, in particular nucleic acids, using said device and a kit for carrying out said method comprising said device.

Abstract: The present invention pertains to a biotechnological method for preparing and/or processing a biological sample, in particular for isolating at least one target biomolecule therefrom, which characterised in that at least one malodour counteractant is used for preventing, reducing, masking and/or suppressing malodour and/or malodour formation during the preparation and/or processing of said biological sample.

Abstract: The present invention refers to a device, comprising a hollow body having at least one open end and at least one barrier inside of the hollow body, which is non-permeable for liquids and solids under ambience conditions, however, becomes liquid-permeable by applying an external force like pressure, drag force or driving power to said barrier, wherein said barrier is spaced from at least one open end of the hollow body, the use of such a device for processing of a liquid sample, a method for preparation of said device and a method for isolation or purification of any biomolecules using said device.

Abstract: The present invention refers to a device, comprising a hollow body having at least one open end and at least one barrier inside or at the end of the hollow body, which is non-permeable for liquids and solids under ambience conditions, however, becomes liquid-permeable by applying an external force like pressure, drag force or driving power to said barrier, the use of such a device for collection, storage, treatment or isolation of a biomolecule or biomolecules containing samples, a method for preparation of said device and a method for isolation or purification of any biomolecules using said device.