Adjective
unprotonated (not comparable)
Not protonated.
Cigarette design ensures that the smoke has enough unprotonated nicotine to rapidly transfer nicotine into the brain but not so much of it as to be too harsh for the smoker. Source: Internet
More unprotonated nicotine in a puff delivers more nicotine to the brain. Source: Internet
The approximate dividing line between dominance by protonated forms or by the unprotonated form is a pH of 8. At pH 8, the two fractions are present in equal parts. Source: Internet