Boiling the plant material with some vitamin C would prevent the oxidation from happening.
Very old plant material tends to have much more N-Oxides. Leaves also tend to have more than bark because they are less protected from oxidation. Powdered material would also be more likely to have more N-Oxides.
Heat and air movement are factors that greatly increase N-Oxide formation. When drying the freebase at the end of extraction, if heat and a fan are used, this can greatly increase N-Oxide formation.
There are actually techs out there that specifically use heat and a fan to create DMT N-Oxide because some people find it more pleasant than DMT. SWIM prefers DMT N-Oxide over DMT, but doesn’t like sticky texture of it. I think no one likes the sticky texture of it. It makes it almost impossible to measure doses. It sticks to everything. If it wasn’t for that, I think DMT N-Oxide would be very popular. It’s more friendly than DMT, and just as visual, but a total pain in the ass to scoop up and measure doses of it for smoking.
You may remember me as 69Ron. I was suspended years ago for selling bunk products under false pretenses. I try to sneak back from time to time under different names, but unfortunately, the moderators of the DMT-Nexus are infinitely smarter than I am.
If you see me at the waterpark, please say hello. I'll be the delusional 50 something in the American flag Speedo, oiling up his monster guns while responding to imaginary requests for selfies from invisible teenage girls.