Hello,
I made an HPLC-MS analysis for methanolic extracts of plants (in negative mode)
Can someone help me to identify the molecule corresponding to this peak through its mass spectrum?
Thank you very much in advance
Sincerely
Given only that information it is very difficult to make a tentative identification of the compound, you have to explain what specific analysis was performed if it was only masses, or masses masses and there are fragments that can further support the identification. Also, information about the compounds previously identified in that plant could help you to know what type of compound it is. I leave you some pages that may help you to identify the compounds.
https://massbank.eu/MassBank/Search
https://mona.fiehnlab.ucdavis.edu/spectra/search
http://www.massbank.jp/Search
https://msbi.ipb-halle.de/MetFrag/
https://metlin.scripps.edu/landing_page.php?pgcontent=mainPage#
If you had high resolution accurate mass data you might be able to determine the molecular formula. However, if m/z 300 is a fragment of m/z 463 then you might be looking at the loss of a hexose, meaning your unknown was glycosylated. Otherwise I defer to the comments made by Gabriela above.
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