How can I remove Stearylamine/ODA from an organic solution which finally needs to be precipitated and dissolved in chloroform? I am repeatedly washing my solution in acetone by centrifugation and pellet resuspension in chloroform and again adding acetone and centrifugation followed by final pellet resuspension in chloroform. But I can obseve yellow coloured fluorescence every time under UV that is peculiar of ODA that should not be seen in my solution. Kindly suggest.

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