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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
  • Managing Lactose Intolerance
    Lactose is a sugar found in some dairy products Lactase is an enzyme in the gut that is needed to break down lactose Many adults have trouble digesting foods with lactose because their level of lactase goes down after childhood, which is normal
  • 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
  • Definition Facts for Lactose Intolerance - NIDDK
    Learn about lactose intolerance, a condition in which you have symptoms—such as bloating, diarrhea, and gas—after you consume foods or drinks that have lactose
  • 13 Cheeses You Can Eat If Youre Lactose-Intolerant - Real Simple
    There are several types of cheeses that those sensitive to lactose can still enjoy See what cheeses may not set off your symptoms if you have lactose intolerance
  • What Is Lactose? - IFIC
    Lactose is sometimes referred to as “milk sugar” because it is only found naturally in the milk of mammals—including cows, goats and humans Milk from cows and goats is used to make cheese and yogurt, but not all milk products contain the same amount of lactose
  • 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
  • 3 Possible Downsides of Drinking Lactose-Free Milk Every Day
    If you're switching to dairy-free products to avoid lactose, be sure to read the nutrition labels to find the option that best fits your needs While all non-dairy milks are lactose-free, they vary in their nutrient content





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