Abstract:
There is provided a capillary assembly suitable for connecting various components of an analytical measuring device, for example a liquid chromatograph or a capillary electrophoresis device, to each other. Specifically, this involves reinforcing the fragile tubing by the addition of PEEK or steel sleeves and/or embedding the tubing in an injection-molded resin such that the tubing is not exposed directly to operator handling and manipulation. Further functional improvement is obtained by including additional components inside the resin. Thereby a versatile and robust capillary assembly is achieved.
Abstract:
There is provided an integrated system for liquid separation, such as LC, CE, affinity chromatography, and ion exchange chromatography, comprising a column and end-fittings embedded in a plastic material, such as a thermoplastic polymer. The system may further comprise an electrospray emitter directly connected with the outlet of the column, wherein a substantial part of the emitter is covered with the polymer material. There is also provided a method by which a separation column along with the accompanying end fittings for connection with adjacent liquid conduits is embedded in a polymer matrix. This configuration e.g. ensures that the factory-made, correct attachment of the fittings to the column is preserved (since the matrix prevents further user intervention, accidental or otherwise).
Abstract:
The present invention provides a novel nanospray emitter that includes a fluid inlet, an outlet orifice, and a passage for fluid: communication between the fluid inlet and outlet orifice. In one aspect of this embodiment, the passage facilitating fluid communication between the inlet and outlet elements is comprised of an outer capillary of a rigid material, such as nickel, that houses an inner capillary made from a highly conductive and inert material, such as gold; alternatively the inner material may constitute an inner coating of the outer capillary.
Abstract:
A method for controlling the flow of liquid in a high performance liquid chromatography apparatus. The method includes operating a pump, measuring the liquid pressure downstream of the pump, measuring the liquid flow rate downstream of the pump, and controlling the operation of the pump. In the method, it is automatically determined whether the pump is controlled to achieve a desired pressure or controlled to achieve a desired flow rate. Fuzzy logic can be applied in the method to determine the switch between the control modes.
Abstract:
The present invention provides a novel nanospray emitter that includes a fluid inlet, an outlet orifice, and a passage for fluid: communication between the fluid inlet and outlet orifice. In one aspect of this embodiment, the passage facilitating fluid communication between the inlet and outlet elements is comprised of an outer capillary of a rigid material, such as nickel, that houses an inner capillary made from a highly conductive and inert material, such as gold; alternatively the inner material may constitute an inner coating of the outer capillary.
Abstract:
The invention relates to antibodies against particular forms of enzymatically-inactive precursors of the prostate specific antigen (PSA), the production and use thereof in immunoassays for the determination of the [-5,-6,-7]-proPSA and application of the measured values from said assays, for an improved diagnosis in the field of prostate carcinomas.
Abstract:
A method is provided for thermally focusing an analyte on a pre-column for liquid chromatography, comprising the steps of enriching the sample on said pre-column at a temperature lower than the operating temperature of a separation column, injecting the sample onto the separation column by heating the pre-column to a temperature higher than the temperature of the separation column and eluting the analyte from the separation column. Optionally, the sample may be subjected to a temperature gradient on the separation column or the separation column may be heated to remove non-eluted sample after the separation is completed.
Abstract:
A method for controlling the flow of liquid in a high performance liquid chromatography apparatus. The method includes operating a pump, measuring the liquid pressure downstream of the pump, measuring the liquid flow rate downstream of the pump, and controlling the operation of the pump. In the method, it is automatically determined whether the pump is controlled to achieve a desired pressure or controlled to achieve a desired flow rate. Fuzzy logic can be applied in the method to determine the switch between the control modes.