Yes, HP-20 can be part of a purification procedure. It is a polymeric reverse phase rather than C18, but it should work.

Thanks alot Prof. Jack, can you tell me about the elution system for purification of flavonoids by diaion and any puplications for this point?

I'd use a gradient with increasing concentrations of methanol in water to 100% methanol.

As for references, a quick search gives: http://cdn.intechopen.com/pdfs-wm/32738.pdf

http://pubs.acs.org/doi/pdf/10.1021/jf9805101, http://home.hiroshima-u.ac.jp/shoyaku/member/yamasaki/Pub/Bassia01.pdf

so there is a lot of information out there.

Thanks alot prof. Jack

Dear Moustafa , Good Morning , we are also in the manufacture of flavones, flavanones, chalcones and flavonoids of methoxy, hydroxy, and other groups  in india, You may detail your end product so that can be betterly helpful.  Regds, Rathnakumar

Diaion HP20 can be used for the purification of flavonoids provided your feed is aqueous. The percentage of polar organic solvent such as methanol, ethanol and isopropanol should not be more than 20% in the feed to favour more binding on the resin. After binding you can elute it with increase in percent methanol or ethanol either in step gradient or linear gradient mode.

Diaion is good, but sephadex is better