A method of controlling undesirable gram-positive microorganism concentration in a fermentation mixture and in a plant biomass, the method comprising the steps of:
- introducing a fermentable carbohydrate to the fermentation mixture;
- introducing at least one desirable microorganism that is capable of fermenting the fermentable carbohydrate to the fermentation mixture;
- and
- introducing a first at least one Ethyl Lauroyl Arginate compound to the fermentation mixture;
- distilling the fermentation mixture to produce whole stillage byproducts;
- separating the plant biomass from the whole stillage byproducts, wherein the plant biomass has a total moisture content as low as about 11%;
- and
- applying a second at least one Ethyl Lauroyl Arginate compound to the plant biomass.