i have used both the dried and fresh ones and i can assure you dry ones gives you better result as compared to fresh but be patient with the shadow dry.

Your question makes no sense if we don't know the purpose of the analysis.  Are you looking to analyse for a particular target compound or class of compounds? Are these compounds you are analysing for stable during the drying process? How are you preparing the dried plant material - frozen rapidly in liquid nitrogen and freeze dried?

Respected Sir,

Thanks for your reply. The chemical compound and structure is not already known so I am talking about the plant whose chemical properties yet to be established. The plant material is dried at normal room temperature.