Foundational Discovery · 1932
Identification of vitamin C as the antiscorbutic factor
Scurvy had been recognized as a disease of dietary deprivation for centuries before its specific cause was known. The Royal Navy had mandated lime juice for sailors since the 1790s on purely empirical grounds, and the connection between fresh citrus and prevention of scurvy was well established in clinical observation. What remained unknown through the nineteenth century and into the twentieth was the identity of the chemical responsible: which compound in citrus or fresh vegetables was doing the preventive work, and whether it was a single substance or a mixture.
Albert Szent-Gyorgyi, a Hungarian physiologist, had isolated a reducing substance from adrenal cortex, orange juice, and cabbage while working in Cambridge and then at the University of Szeged. He called it hexuronic acid, published its chemical characterization, and by 1930 suspected it was the antiscorbutic factor. Confirmation required showing the isolated compound could prevent or cure scurvy, which he was slow to demonstrate directly. At the University of Pittsburgh, Charles Glen King and his collaborator W. A. Waugh were pursuing the same compound from lemon juice by a different route. King and Waugh published in April 1932 in Science, identifying their crystalline isolate as the antiscorbutic agent. Szent-Gyorgyi, working simultaneously, reached the same conclusion and proposed renaming hexuronic acid as ascorbic acid. A priority dispute that both men prosecuted actively for years followed.
Neither the dispute nor its resolution changed what was known about the compound itself. King and Waugh published first by a matter of weeks, but both groups had converged on the same molecule through independent routes. Its structure was not in question: a six-carbon lactone with a reducing enediol group, stable in acid and unstable in alkaline or oxidizing conditions. The structure was confirmed and the compound synthesized by 1933, which immediately opened the way to industrial production and an end to dependence on dietary sources for supply.
Biochemical characterization of ascorbic acid's roles has continued since 1932. It serves as a cofactor for prolyl hydroxylase and lysyl hydroxylase, the enzymes required for collagen cross-linking; deficiency interrupts collagen synthesis and produces the connective tissue breakdown characteristic of scurvy. Ascorbic acid also functions as a water-soluble antioxidant and participates in carnitine biosynthesis and neurotransmitter metabolism. Recommended daily allowances have been revised multiple times as these roles have been elaborated.
Szent-Gyorgyi received the 1937 Nobel Prize in Physiology or Medicine, with ascorbic acid cited alongside his work on cellular respiration. King received no Nobel. The episode illustrated how simultaneous independent convergence on the same discovery creates attribution problems that formal prize committees resolve imperfectly. Industrial synthesis of ascorbic acid began in Switzerland in 1934, using the Reichstein process, and the compound has been manufactured at commodity scale ever since.
Key People
- Albert Szent-Gyorgyi — Hungarian physiologist; isolated and characterized ascorbic acid; Nobel 1937
- Charles Glen King — American biochemist; published identification of antiscorbutic factor in April 1932
- W. A. Waugh — King's collaborator on the isolation and identification experiments
- Tadeus Reichstein — Swiss chemist who developed the industrial synthesis process for ascorbic acid in 1934
Science, 1932 (King & Waugh); J Biol Chem, 1932 (Waugh & King)
Related landmarks
- 1912 · Funk's vitamine (vital amine) hypothesis (Foundational Discovery)
- 1955 · Sanger's Sequencing of Insulin (Foundational Discovery)
- 1901 · Discovery of the ABO Blood Groups (Foundational Discovery)
- 1895 · Roentgen's discovery of X-rays (Foundational Discovery)