Originally a student of art, Hans von Euler-Chelpin continued Harden and Young’s work by studying the details of the reactions that occur in the fermentation process. In this work, con Euler-Chelpin was able to further separate components of the heat-stable fraction of the yeast cells, and in so doing he “purified” NAD. In addition, von Euler-Chelpin is credited with uncovering the first information about the chemical shape and properties of the co-factor that allowed fermentation reactions to proceed (i.e. the chemical structure). https://www.nobelprize.org/nobel_prizes/chemistry/laureates/1929/euler-chelpin-lecture.pdf