When you first receive a Cogent™ HPLC column, its performance should be checked by running a quick test to measure peak symmetry and efficiency. The column you purchased came with a Packing Test Chromatogram that shows the original QC values (peak shape, plate count) of test solutes under specified conditions. When you follow the conditions in that test and inject the same analytes, you will be able to check the values you obtain against those originally reported on the sheet. A discrepancy may point to a possible issue with the stationary phase. It is also possible that the instrument itself is at fault, for example if extra-column volume is excessive and contributes to poor peak shape. In any case, performing this simple test is the first step in identifying any potential issue with a new column.

In the below downloadable pdfs, you will find a general packing test procedure as well as example chromatograms from the different phases.


Amide.pdf   0.4 Mb   Download File
Bidentate C18 2um.pdf   0.4 Mb   Download File
Bidentate C18.pdf   0.4 Mb   Download File
Bidentate C8.pdf   0.4 Mb   Download File
Diamond Hydride 2um.pdf   0.4 Mb   Download File
Diamond Hydride.pdf   0.4 Mb   Download File
Diol 2um.pdf   0.4 Mb   Download File
Diol.pdf   0.4 Mb   Download File
Packing Test Procedure.pdf   0.3 Mb   Download File
Phenyl Hydride.pdf   0.4 Mb   Download File
Silica-C 2um.pdf   0.4 Mb   Download File
Silica-C.pdf   0.4 Mb   Download File
UDA.pdf   0.4 Mb   Download File
UDC 2um.pdf   0.4 Mb   Download File
UDC.pdf   0.4 Mb   Download File