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,
Abel Seyler the Younger Abel Seyler the Younger Abel Jacob Gerhard Seyler (1756 – 1805), also known as Abel Seyler the Younger, was a German scholar, pharmacist, freemason and a member of the original Illuminati order. Described as highly erudite, he was court pharmacist in Celle from 1791 to 1803, and also owned the famous Andreae & Co. court pharmacy in Hanover with his two siblings as co-owners from 1793 to 1803. He was the oldest son of the Swiss-born banker turned theatre principal Abel Seyler and his first wife Sophie Elisabeth Andreae, and was a maternal grandson of the wealthy Hanover court pharmacist