Augustin-Pierre Dubrunfaut (; 1 September 1797,

Lille Lille ( , ; nl, Rijsel ; pcd, Lile; vls, Rysel) is a city in the northern part of France, in French Flanders. On the river Deûle, near France's border with Belgium, it is the capital of the Hauts-de-France region, the prefecture of the No ...

– 7 October 1881) was a French chemist.

Mutarotation Mutarotation is the change in the '' optical rotation'' because of the change in the equilibrium between two anomers, when the corresponding stereocenters interconvert. Cyclic sugars show mutarotation as α and β anomeric forms interconvert. The ...

was discovered by Dubrunfaut in 1844, when he noticed that the specific rotation of aqueous sugar solution changes with time. In the same paper, he also identified that the inversion of sucrose in the presence of brewer's yeast (''Saccharomyces cerevisiae'') was not a consequence of fermentation. The organic

fructose Fructose, or fruit sugar, is a ketonic simple sugar found in many plants, where it is often bonded to glucose to form the disaccharide sucrose. It is one of the three dietary monosaccharides, along with glucose and galactose, that are absorb ...

molecule was subsequently discovered by Dubrunfaut in 1847. He also discovered

maltose } Maltose ( or ), also known as maltobiose or malt sugar, is a disaccharide formed from two units of glucose joined with an α(1→4) bond. In the isomer isomaltose, the two glucose molecules are joined with an α(1→6) bond. Maltose is the tw ...

, although this discovery was not widely accepted until it was confirmed in 1872 by

Cornelius O'Sullivan Cornelius O'Sullivan, FRS (20 December 1841 – 8 January 1907) was an Irish brewer's chemist. He was born the son of merchant James O'Sullivan of Bandon, County Cork and was educated locally, before winning a scholarship to study chemistry at th ...

Works

* ''Art de fabriquer le sucre de betteraves, contenant 1. la description des meilleures méthodes usitées pour la culture et la conservation de cette racine''openlibrary.org
/ref> * ''Traité complet de l'art de la distillation'' Paris: Bachelier, 1824

References

19th-century French chemists 1797 births 1881 deaths {{France-chemist-stub fr.wikipedia.org Augustin-Pierre Dubrunfaut