Answer: We choose corn because of the neutral final profile that only corn ethanol can achieve.
Mr. Tincture Says:
Ethanols that begin with Cane, Grapes, or Wheat each produce their own uniquely profiled distillate that can be tasted and smelled.
The neutral profile of corn ethanol makes for neutral evaporated concentrates as well.
The odors and flavors present in an ethanol are derived by longer chained alcohol contained within the ethanol, and are the last to be evaporated out or purged. Eliminating them int he first place by using the right solvent is the best way to keep those alkanes and fusel oils out of the medicine.