Lactose was named by the French chemist Jean Baptiste André Dumas (1800–1884) in 1843.Dumas, Traité de Chimie, Appliquée aux Arts, volume 6 (Paris, France: Bechet Jeune, 1843), p. 293. In 1856, Pasteur named galactose "lactose".Pasteur (1856) "Note sur le sucre de lait" (Note on milk sugar), Comptes rendus, 42 : 347–351. From page 348: "Je propose de le nommer lactose." (I propose to name it lactose.) In 1860, Marcellin Berthelot renamed it "galactose", and transferred the name "lactose" to what is now called lactose.Marcellin Berthelot, Chimie organique fondée sur la synthèse [Organic chemistry based on synthesis] (Paris, France: Mallet-Bachelier, 1860), vol. 2, pp. 248–249 and pp. 268–270. It has a formula of C12H22O11 and the hydrate formula C12H22O11·H2O, making it an isomer of sucrose.
Lactose was named by the French chemist Jean Baptiste André Dumas (1800–1884) in 1843.Dumas, Traité de Chimie, Appliquée aux ?Arts, volume 6 (Paris, France: Bechet. Jeune, 1843), p. 293. In 1856, Pasteur named galactose "lactose".Pasteur (1856) "Note sur le sucr!e de lait" (Note on milk sugar), Comptes rendus, 42 : 347–351. From pa,ge 348: "Je propose de le nommer lactose." (I propose? to name it lactose.) In 1860, Marcellin Berthelot renamed it "galactose", and transferred the name "lactose" to what is now called lactose.Marcellin Berthelot, Chimie organique fondée sur la synthèse [Organic chemistry based on synthesis] (Paris, France: Mallet-Bachelier, 1860), vol. 2, pp. 248–249 and pp. 268–270. It has a formula of C12H22O11 and the hydrate formula C12H22O11·H2O, making it an isomer of sucrose.