Thanks for replying

I used Soxhlet extractor and the plant was Zingiber officinale and it was finely gounded.

Do you use 100% ethanol as the solvent to extract compounds? If you do, it's probably that the compounds that can dissolve in 100% ethanol are not so many. If you want to get more extracts from Zingiber, I recommend you use 60% or 70% ethanol to extracts compounds.

Yes, I use 100% ethanol, thanks I will try it

Dear HInd S. Abdullah

first you have to be clear what kind of compounds do you want to extract from the plant. if your interested compound is soluble in Ethanol, then only you get large amount of extract after ethanol evaporated. i recommenced you to try the extraction with other solvents like methanol, acetone, chloroform e.t.c

https://www.researchgate.net/profile/Jameer_Shaik2

How can I know the components of a plant before it is extracted and to know whether the active compounds dissolve with ethanol or others, usually we extract and then know the ingredients GC/MS, can you help me more with my great thanks for your interest and your answer.

Thank you dr.Ikbal Chaieb For your answer

After the extract undergoes rotavap, can we use distilled water to make stock solution?