Flash chromatography cartridge

Abstract

A low pressure liquid chromatographic cartridge is provided having a tubular polymer container adapted to receive a chromatographic packing material. The container has an outlet port located at a downstream end of the container and container threads formed on an upstream end of the container. A polymer cap having cap threads located on the cap threadingly engage the container threads. An inlet port is located on an upstream end of the cap. A resilient fluid tight seal is interposed between the polymer cap and container suitable for use in low pressure liquid chromatography. A locking tab on a skirt of the cap engages a recess on the container when the seal engages the cap and container to lock the cap in position relative to the container.

1 .- 22 . (canceled) 
     
     
         23 . A method for low pressure liquid chromatographic analysis of a material using a liquid chromatographic cartridge kit assembled by a user of the kit, said kit including a hollow cylindrical polypropylene container and a polypropylene cap with a fluid inlet for attachment to one end of said container by the user to form a chromatographic cartridge, wherein said container includes a fluid outlet at another end thereof and has a chromatographic packing material placed therein before said kit is obtained by the user, said packing material having a surface spaced from said one end of said container to form a predetermined volume between said surface and said cap sufficient to hold a sample for chromatographic analysis when said cap is attached to said container, and said container further includes a threaded portion on an external surface thereof proximate to said one end and said cap comprises a depending skirt having a threaded portion on an internal surface thereof for engaging said threaded portion on said container, the method comprising:
 placing the sample in said volume;   thereafter screwing said cap onto said container into a final position by engaging said respective threaded portions to provide a seal between said container and said cap capable of withstanding pressures up to about 100 psi, said seal being formed between (a) an inner surface of said container proximate to said upstream end thereof, said container including an inclined lip portion surrounding said inner surface of said upstream end and presenting a flat inner surface extending to the upstream end of said container, and (b) a cap flange disposed for accepting said container between said skirt and said flange with said flat inner surface contacting said cap flange to urge said flange inwardly toward said longitudinal axis as said cap is screwed onto said container, wherein said cap flange consists of a single flange that depends from the interior of said cap and contacts said container when said cap is in said final position and said single flange extends beyond the most upstream end of said threaded portion on said skirt;   attaching a low pressure liquid chromatographic apparatus to said inlet for introducing chromatographic process fluid into said inlet under a pressure up to about 100 psi; and   introducing said chromatographic process fluid from said outlet to said low pressure liquid chromatographic apparatus for analysis.   
     
     
         24 . A method for low pressure liquid chromatographic analysis as in  claim 23 , wherein said cap has been screwed onto said container when said kit is obtained by the user, said method further comprising:
 removing said cap from said container before placing the sample into said volume; and   resealing said cap to said container.   
     
     
         25 . A method for low pressure liquid chromatographic analysis as in  claim 24 , wherein said method includes interposing an O-ring between abutting portions of said container and said cap when said cap is in said final position.