As
@woodsroad has stated, tobacco already treated for fungus. I would not add another chemical. As far as removing Oxygen, just seal a well packed jar and the microenvironment will do it for you! That is how tobacco ages / ferments. Just do not open the lid, or the process has to restart all over again until the Oxygen is gone.
Most fungi are obligate aerobes - that means that they require Oxygen to live and grow. Once the Oxygen is gone, the anaerobic organisms begin the process of fermentation. If you want to get rid of them, just open the lid as Oxygen will kill them off.
I always wondered why some suggest to pack the jar loosely to allow extra air. It just takes longer to get rid of the Oxygen to begin fermentation.