generally we use to do nutritional parameter study by the crude material of plant, but I want to know if we will take any organic solvent extract of any plant material can we do the nutritional parameter study.
I think the best way is always a crude extract, but if you make a series of extracts in increasing polarity and you do the study in each of them you can know what substances are in each and compare it with the crude extract so as not to lose any compound.