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The presumption is that it would necessarily be of biological origin if it were picked up in atmosphere.

I think the parent was asking if there's a separate family of abiotic amino acids in the upper atmosphere? Like from UV photochemistry stuff.

(I don't know the answer either)

That's an interesting question and I don't know the answer! But I'd expect any amino acids produced this way to diffuse and mix with the biologic amino acids from the surface. They'd be diluted by the overwhelming amount of biological "stuff." Stereoisomers should behave the same under the influence of gravity.

- "Stereoisomers should behave the same under the influence of gravity."

Only one way to find out!

https://sci-hub.se/https://doi.org/10.1103/PhysRevLett.121.2... ("Test of the Equivalence Principle with Chiral Masses Using a Rotating Torsion Pendulum")

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