September 29, 2020, 11:04:34 PM
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Topic: Detection of primary amines vs. quaternary amines on a curved surface?  (Read 2534 times)

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Offline heyhey

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I would like to be able to determine whether a given curved surface of a material is modified with either primary amines or quaternary amines. Any ideas on how to go about this?

I was thinking about doing something that can determine hydrogen bonding on the surface. So at first I thought of water drop contact angle test but I don't think this is feasible on a curved surface. Then I thought that maybe I can test if the given surface reacts with carbodiimides (primary amines would, quartenary amines won't) but I would expect so little to react that the mass difference of CDI product left in the beaker would be unmeasurable. Is there perhaps some flourescent molecule that I could easily test to see if it conjugates to the surface? Is there some better and simple procedure that I can measure this?

I was thinking X-ray spectroscopy but I don't have access to this sort of instrumentation.

Offline wildfyr

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Fluorescein test. Used to quantify quaternary amines on surfaces

For the amines, perhaps you can prepare an activated ester (either NHS or PFP ester) version of a dye molecule, and it should react quantitatively with surface amines.

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