Please, how can I prepare 100% concentration stock solution of a powdered plant extract?

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Shiv Kumar Yadav

question is not clear you may require chromatography to enrich the contents

Mushtaq Ahmad

https://www.researchgate.net/post/How_would_you_make_a_liquid_out_of_a_powdered_plant_extract

read these answers

Noura S. Dosoky

I think you can just add a suitable solvent in adequate proportion such as 100 g powder/100 mL solvent.

http://www.physiologyweb.com/calculators/percent_solutions_calculator.html