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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
  • 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
  • Lactose: Uses, Health Benefits, and Lactose Intolerance
    Lactose is white and odorless, and you may sometimes see or hear it referred to as "milk sugar " Lactose is only found in milk from mammals, so plant-based milk products like almond milk and soy milk don’t contain it The enzyme lactase helps the human body digest lactose
  • 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
  • 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
  • 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
  • Lactose Intolerance – Cause, Symptoms, Diagnosis, Treatment
    Lactose is the sugar that’s in milk Our bodies use an enzyme called lactase to break down that sugar so we can absorb it into our bodies But people with lactose intolerance don’t have enough
  • Diet for Lactose Intolerance
    You may be able to eat yogurt or harder cheeses because they may have less lactose Try lactose-free and reduced-lactose products There are many lactose-free and lactose-reduced dairy products available, including milk, ice cream, and cheeses These can allow you to still enjoy dairy products
  • Lactose Intolerance: Symptoms, Diagnostic Tests Treatment
    Begin with a lactose-free diet, then gradually reintroduce lactose-containing foods to see how your system responds Some people with lactose intolerance can tolerate up to 12 grams (g) of lactose at one time, which is a cup of milk or a scoop of ice cream





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