Sigmund Fraenkel or Sigmund Fränkel (22 May 1868, in Krakau – 7 June 1939, in Geneva) was a Polish-born chemist who lived and worked in Austria, and is notable for being the head of the Ludwig-Spiegler-Stiftung in Vienna from 1904 and his work in the field of Physiological chemistry, notably on the chemistry of the thyroid gland. He studied at the University of Vienna under Ernst Ludwig (1842-1915) and Ernst Wilhelm von Brücke, in Prague under Karl Hugo Huppert (1832-1904) and in Freiburg im Breisgau. In 1892 he obtained his doctorate in medicine in Vienna, and in 1896 he was Private Tutor in Medicinal chemistry.
- Die Arzneimittel-Synthese auf Grundlage der Beziehungen zwischen chemischen Aufbau und Wirkung : für Ärzte, Chemiker und Pharmazeuten . Springer, Berlin 3rd ed. 1912 Digital edition by the University and State Library Düsseldorf
- Hubert Richardson (1905). The thyroid and parathyroid glands. Blakiston's. p. 56. Retrieved 23 May 2013.
- A. S. Travis (31 October 1998). Determinants in the Evolution of the European Chemical Industry, 1900-1939: New Technologies, Political Frameworks, Markets and Companies. Springer. pp. 268–. ISBN 978-0-7923-4890-0. Retrieved 23 May 2013.
- Mario Thevis (13 December 2010). Mass Spectrometry in Sports Drug Testing: Characterization of Prohibited Substances and Doping Control Analytical Assays. John Wiley & Sons. pp. 4–. ISBN 978-1-118-03514-6. Retrieved 23 May 2013.
- "Full text of "The Thyroid and parathyroid glands"". Archive.org. Retrieved 2013-05-23.
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