nope
gas phase is mostly empty space. liquid provides a more effective medium to conduct
intermolecular interactions, in this case, protonating/deprotonating the terminal amine.
one could gas the nonpolar phase, if it is sufficiently saturated.
but gassing plant material (unless it is a supercritical fluid extraction, using a nonpolar solvent...and even then, it is technically a fluid) isn't going to work.
"Nothing is true, everything is permitted." ~ hassan i sabbah
"Experiments are the only means of attaining knowledge at our disposal. The rest is poetry, imagination." -Max Planck