Please specify, flavonoids, biflavonoids, polyphenols, terpenoic phenols.........

Hi Marc, you can use Sieve program ( http://portal.thermo-brims.com/), you can get a 30 day free trial, which should be enough time for you identify your compounds.

That program use Chemspider database for identification.

Cheers

Mr Marc, I search to analyse flavonoids and phenolic acids

Cheers

I also used the LC-MS to qualify and quantify phenolic compounds in the plant extracts. You can have a look at our optimized method and see whether it's useful for you. 

https://www.researchgate.net/publication/261762554_Characterisation_of_polyphenolic_compounds_in_Clerodendrum_petasites_S._Moore_and_their_potential_for_topical_delivery_through_the_skin

Article Characterisation of polyphenolic compounds in Clerodendrum p...