Chromatography Forum

Hi
I measure 4-hydroxy-3-methoxymandelic acid (HMMA) by reverse phase HPLC with Electrochemical detection.
Currently I use 3-hydroxy-4-methoxymandelic acid (iso-HMMA) as an internal standard, but I can't find a supplier to replenish my stock.

Does anyone know of a supplier for this reagent, or can anyone suggest an alternate substance that I can use as an internal standard?

Thanks

Craig

Craig,
you can search for your compound in: http://www.emolecules.com/

This database is free to use and will give you the names of suppliers to contact.

Good luck!
Kerri