Pre-assembled separation columns
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). Accordingly, the responsibility for the correct attachment of the fittings is shifted from the end user to the manufacturer.
1. An integrated separation column unit comprising end fittings, a separation column, an electrospray emitter, and a plastic material, wherein the separation column is connected directly or via a transferring conduit with the electrospray emitter through one of the end fittings, and wherein the plastic material is molded to the separation column, the end fittings, and the electrospray emitter in a mold so that the separation column, the end fittings, and the electrospray emitter are embedded in the plastic material which houses the integrated separation column unit.
2. The integrated separation column unit of claim 1 , wherein the electrospray emitter is either based on a glass capillary coated with electrically conductive material or a conductive metal.
3. The integrated separation column unit of claim 2 , wherein the conductive metal is stainless steel.
4. The integrated separation column unit of claim 1 further comprising one of more of:
RFID-tag, heating/cooling bars and thermo sensor, a high-voltage contact point for the electrospray emitter, counter electrode(s) with a geometry that benefits definition of the field lines around the electrospray emitter, and channels for gas flow embedded in the same plastic material.
5. The integrated separation column unit of claim 1 , wherein the plastic material is at least one of: a thermoplastic material, polyetheretherketone (PEEK), flouropolymer, or duroplastic material or compound.
6. The integrated separation column unit of claim 5 , wherein the thermoplastic material comprises polyamide and/or polyurethane.
7. The integrated separation column unit of claim 5 , wherein the flouropolymer comprises perfluoroamines (PFA) or flourinated ethylene-propylene copolymer (FEP).
8. The integrated separation column unit of claim 5 , wherein the duroplastic material or compound comprises polyimide or liquid crystal polymers (LCP).
9. The integrated separation column unit of claim 1 , wherein the outer surface of the integrated separation column unit is at least partly surrounded with the plastic material.