First of all, the crude extract plant is normally a very dark gum and may be you have hundreds of components, what type of phytochemicals do you want to quantify?. GC or HPLC are important to quantify but I am sure you will get a lot of peaks or may be you won't find a clear base line. How to quantify in this situation?. Please think about it.
Check these publications and several other threads on the subject:
You can quantify or standardized your extract with the help of a standard by UV , HPLC or GC
The best way to quantify the phytochemicals in a crude plant extract is the HPTLC method, which provide peak and peak area provides concentration of concerned compound in comparison to standard. Sum total of peak area will be equivalent to total yield from the crude extract. It will be amount of pure compound from HPTLC X 100/amount of total extract dry biomass.
I agree with Ravi, cheap and easiest way to study phytochemicals in plant extracts is using HPTLC/TLC methods, please open this data base from Camag, you will find many applications in this data base etc .
http://www.camag.com/en/tlc_hptlc/customer_magazine_cbs/ccbs_database.cfm?method=query
Usually I used also other methods e.g. GC MS or LC MS
Check this informative link:
http://www.slideshare.net/rahulbs89/extraction-of-plant-contituents
First of all, the crude extract plant is normally a very dark gum and may be you have hundreds of components, what type of phytochemicals do you want to quantify?. GC or HPLC are important to quantify but I am sure you will get a lot of peaks or may be you won't find a clear base line. How to quantify in this situation?. Please think about it.
Depend on your compound target, please using the same phytochemical standard to determine of that quantity and used the spectrophotometry UV-Vis or HPTLC instrument.
Check a similar thread:
https://www.researchgate.net/post/which_parameter_and_method_should_follow_for_Identifiaction_purifacation_and_characterization_of_crude_extract?tpr_view=8f382a13-d93d-49b2-90a5-cc2db2cf5a61_1#554b0753d4c118422d8b458a
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