I dont think that points to anything. So someone had some gunk that wouldnt dissolve in xylene and neither water? Well that wasnt n-oxide, because it should dissolve in both

. God knows what that stuff was.. Then one added ascorbic acid and it dissolved, in what, in water, in xylene? Where was the gunk left, in the water? There's way too many questions there.
In any case, feel free to try. but remember to make a control test (for example redissolve half of your substance in another acid that isnt ascorbic, and extract the substance the same way, see if there are differences)
How did you get your n-oxide in the first place, and how do you know its really n-oxide?