Got a water soluble fraction which is white and amorphous but no TLC detection by any means. So it is possible for an organic compound being low. Tried dissolving with acids and it dissolves well in sulfuric acid (and not charred) but it did not dissolve in HCl. If it is metallic oxide, or something like that, then how it is possible to detect what it is?
why don't you try analysing the fraction with IR and raman spectroscopy? Information from both techniques together could give you a quick and rough idea of the types of bonds and atoms in the substance. metallic oxides could also be detected with these methods. it's worth a shot because they are quick and easy methods of analysis. Use an appropriate control as well to allow for any background bands....
How did you get this fraction by the way? What extraction and separation methods did you use?
I'm not an expert on plant products at all so I cant be much help on suggesting what types of salts it could be! i'm only suggesting properties from the description you've given - white, not charring in sulphuric acid, elutes in water from a column thats designed to retain organic compounds, no detection in TLC etc.
If you want to find out what it is you may have to analyse the fraction further using instrumental techniques (Vib spec is a good starting point)..... or else you could look into why it dissolved in sulfuric acid and not HCl.
Also you cant be sure if its only one compound in the fraction??
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