lactose
lactose lac"tose` (l[a^]k"t[=o]s`), n. 1. (Physiol. Chem.) The main sugar present in milk, called also {sugar of milk} or {milk sugar}. When isolated pure it is obtained crystalline; it is separable from the whey by evaporation and crystallization. It is a disaccharide with the formula {C12H22O11}, being chemically 4-([beta]-D-galactosido)-D-glucose. It has a slightly sweet taste, is dextrorotary, and is much less soluble in water than either cane sugar or glucose. Formerly called {lactin}. When hydrolyzed it yields glucose and galactose. In cells it may be hydrolyzed by the enzyme [beta]-galactosidase. [1913 Webster +PJC]

2. (Chem.) See {Galactose}. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Lactose — (Milk sugar) IUPAC name β D galactopyranosyl (1→4) D glucose …   Wikipedia

  • Lactose — Général Nom IUPAC β D galactopyrannosyl (1→4)β D glucopyrannose Synonymes …   Wikipédia en Français

  • lactose — [ laktoz ] n. m. • 1843, aussi fém.; de lact(o) et 1. ose ♦ Chim. Diholoside contenu dans le lait des mammifères (C12H22O11), hydrolysable en glucose et galactose. ● lactose nom masculin Sucre (molécule à 12 atomes de carbone) contenu dans le… …   Encyclopédie Universelle

  • lactose — lactose. См. молочный сахар. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • Lactose — Lactose, der durch Säuren veränderte Milchzucker, s.d …   Pierer's Universal-Lexikon

  • Lactose — Lactose, Milchzucker, Kohlenhydrat aus der Gruppe der ⇒ Oligosaccharide; Disaccharid aus den β 1,4 glykosidisch verknüpften Monosacchariden Glucose und Galactose. L. ist in der Milch der Säuger vorhanden und wird von den Milchsäurebakterien in… …   Deutsch wörterbuch der biologie

  • Lactose — vgl. Laktose …   Das Wörterbuch medizinischer Fachausdrücke

  • lactose — sugar from milk, 1858, from French, coined by French chemist Marcelin Pierre Eugène Berthelot (1827 1907) from L. lac (gen. lactis) milk (see LACTATION (Cf. lactation)) + chemical suffix ose …   Etymology dictionary

  • lactose — |lâct| s. f. Açúcar de leite …   Dicionário da Língua Portuguesa

  • lactose — ► NOUN Chemistry ▪ a compound sugar present in milk …   English terms dictionary

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