He was able to separate two enantiomer crystals that rotated polarized light in opposite directions .
In 1843 , Louis Pasteur discovered optical activity in paratartaric , or racemic , acid found in grape wine .
Louis Pasteur was able to separate two enantiomer crystals that rotated polarized light in opposite directions .
In 1843 , Louis Pasteur discovered optical activity in paratartaric , or racemic , acid found in grape wine .