If you have a hot sauce extract containing nordihydrocapsaicin, capsaicin, dihydrocapsaicin, and homodihydrocapsaicin, the Cogent Bidentate C18 2.o™ HPLC column is a good choice for sufficient separation when the compounds are analyzed by LC-MS; look for the  [M+H]+ ions.

The following gradient should be a good starting point:

You may get EICs which look like this:

1. nordihydrocapsaicin, 294.2064 m/z [M+H]+
2. capsaicin, 306.2064 m/z [M+H]+
3. dihydrocapsaicin, 308.2220 m/z [M+H]+
4. homodihydrocapsaicin, 322.2377 m/z [M+H]+

For peaks 1 and 2, you will be able to obtain separate peaks for each compound in the EICs so there will not be an issue of interference from co-elution.

In terms of sample preparation, try using a Soxhlet extraction procedure.

Click HERE for Cogent Bidentate C18 HPLC Column Ordering Information.