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lactose    音标拼音: [l'æktos]
n. 乳糖

乳糖

lactose
n 1: a sugar comprising one glucose molecule linked to a
galactose molecule; occurs only in milk; "cow's milk
contains about 4.7% lactose" [synonym: {lactose}, {milk sugar}]

Galactose \Ga*lac"tose\, n. (Chem.)
A white, crystalline sugar, {C6H12O6}, isomeric with
dextrose, obtained by the decomposition of milk sugar, and
also from certain gums. When oxidized it forms mucic acid.
Called also {lactose} (though it is not lactose proper).
[1913 Webster]


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]


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  • Lactose - Wikipedia
    Lactose is a disaccharide composed of galactose and glucose, which form a β-1→4 glycosidic linkage Its systematic name is β- D -galactopyranosyl- (1→4)- D -glucose
  • What Is Lactose? - Cleveland Clinic Health Essentials
    Lactose is a natural, complex sugar produced in all mammalian milk that’s difficult to breakdown unless you have lactase, a protein, in your small bowel
  • Lactose intolerance - Symptoms causes - Mayo Clinic
    Lactose intolerance is a condition that makes it hard to digest the sugar in milk and milk products, called lactose People with lactose intolerance often have diarrhea, gas and bloating after eating or drinking foods containing lactose
  • 5 Foods High in Lactose to Avoid - WebMD
    Lactose is a sugar naturally found in dairy products like milk, butter, yogurt, and more Learn which 5 foods to avoid for lactose intolerance
  • Lactose intolerance - Wikipedia
    Another reason is that lactose intolerance tends to be under-reported: most lactose-intolerant individuals can tolerate at least some lactose before they show symptoms, and their symptoms differ in severity
  • What Has Lactose in It? Common and Hidden Sources
    Lactose hides in more than just milk Learn which dairy products, processed foods, drinks, and even medications contain lactose and how to spot it on labels
  • Lactose-Free Milk vs. Regular Milk: What’s the Difference?
    Lactose is a type of sugar naturally found in milk and dairy products Usually, when a person eats something containing lactose, an enzyme called lactase breaks it down into simple sugars called glucose and galactose These simple sugars are then absorbed into the bloodstream
  • Lactose: Characteristics, Food and Drug-Related Applications, and Its . . .
    The positive and negative health-related effects of lactose are reported, focusing on the condition of lactose intolerance, for which an adequate lactose-free diet has to be followed to avoid symptoms that impairs quality of life
  • Is Lactose Good for You? Benefits and Side Effects
    Lactose is a sugar made of two simpler sugars, glucose and galactose, bonded together When you drink milk or eat dairy, an enzyme in your small intestine splits lactose apart so your body can absorb those two sugars for energy
  • Lactose | Milk Sugar, Digestion Nutrition | Britannica
    Lactose, carbohydrate containing one molecule of glucose and one of galactose linked together Composing about 2 to 8 percent of the milk of all mammals, lactose is sometimes called milk sugar





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