Chromatography columns, systems and methods

1. An axial flow chromatography column comprising:

a housing comprising a side wall;

axially spaced first and second end units positioned opposed to each other and separated by and secured to said side wall;

a first filter which is adjacent to said first end unit and a second filter which is adjacent to said second end unit wherein said first and second filters together with the side wall define an enclosed bed space for containing a bed of particulate medium therein;

the first end unit including a first port positioned at a level or elevation, the first port being in fluid communication with said enclosed bed space for adding a liquid to or removing a liquid from the enclosed bed space for separation on said chromatography column; and

a second port being attached to the first end and comprising a passageway extending through the second end unit and in fluid communication with the first port and the enclosed bed space; and

a hollow member being integral with the column and attached to the second port at the first end unit and attached between the first end unit and the second end unit to be in fluid communication with the passageway wherein the second port is in communication with the passageway and the enclosed bed space via the hollow member,

wherein the liquid added to the first port passes through the first filter into the enclosed bed space, and exits said chromatography column through the second filter and via said passageway to the second port, the second port positioned at the level or elevation of the first port above the enclosed bed space on said chromatography column.

2. The chromatography column of claim 1 , wherein the hollow member is connected to said passageway in the second unit.

3. The chromatography column of claim 2 , wherein said passageway extends from the enclosed bed space through a lateral wall of the second end unit.

4. The chromatography column of claim 1 , wherein the first end unit additionally includes a valve means which is in fluid communication with the enclosed bed space, the valve means includes a longitudinal member extending through said first filter and having a passageway therein, the valve being operably openable and closable to allow filling of the enclosed bed space with particulate medium through said passageway.

5. The chromatography column of claim 4 , wherein said longitudinal member of said valve means comprises a nozzle.

6. The chromatography column of claim 5 , wherein said nozzle is fixed within the enclosed bed space or retractable to a position out with the enclosed bed space.

7. The chromatography column of claim 1 , wherein said valve means does not allow emptying of the enclosed bed space of particulate medium.

8. The chromatography column of claim 1 , wherein said chromatography column is prepacked with particulate medium.

9. The chromatography column of claim 7 , wherein said chromatography column is disposable.

10. A method for separating one or more analytes in a liquid from each other, comprising:

applying said liquid containing said one or more analytes to the chromatography column of claim 1 , said chromatography column containing a bed of particulate medium therein;

eluting said one or more analytes with a mobile phase; and

collecting fractions of said mobile phase eluting from the chromatography column.

11. A system for separating one or more analytes in a liquid from each other, said system comprising:

an inlet or inlet manifold in fluid communication with said liquid;

a pump;

the chromatography column of claim 1 ; and

an outlet or outlet manifold.

12. The system of claim 11 , further comprising a valve operably openable and closable to allow the addition of liquid to, or the removal of liquid from, the enclosed bed space.