John Jacob Abel to successfully isolate the neutral base of epinephrine by adding ammonium to highly concentrated extract, a method Abel himself tried but failed due to the use of low concentration of extract. After Takamine's success, Abel himself remarked, with great candor, "The efforts of years on my part in this once mysterious field of suprarenal, medullary biochemistry, marred by blunders as they were, eventuated, then, in the isolation of the hormone not in the form of the free base but in that of its monobenzoyl derivative." Together with L.G. Rowntree and B.B. Turner, Abel devised what they called a "vividiffusion" apparatus,
Jacob Friedrich von Abel Jacob Friedrich von Abel Jacob Friedrich von Abel (9 May 1751 – 7 July 1829) was a German philosopher. His main interest was the human soul and in trying to find a proof for its immortality. Born in Vaihingen an der Enz, von Abel studied philology, philosophy and theology in the lower seminaries in Denkendorf and Maulbronn and in the higher seminary in Tübingen. He graduated in 1770 and was appointed professor of philosophy at the "Militär-Pflanzschule" at the Solitude Palace which moved later to Stuttgart. While there, he was one of Schiller's teachers and a good friend (becoming the