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What pH is required to dissolve the alkaloids back into solution after removing the base layer


Rising Star
Found a mention somewhere that after adding sodium carbonate the solution needs to have pH 10 to precipitate the harmalas.
Once the base layer is removed, what pH is required to re-dissolve the harmalas back into solution?
Thank you.
I think that Loveall found out that with lower pH, some impurity precipitated together with harmalas in alkaline step will dissolve back into solution.
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