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lactose    音標拼音: [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 and has the molecular formula C 12 H 22 O 11 Lactose makes up around 2–8% of milk (by mass) The name comes from lact (gen lactis), the Latin word for milk, plus the suffix -ose used to name sugars The compound is a white, water-soluble, non- hygroscopic solid with a mildly sweet
  • Lactose intolerance - Symptoms causes - Mayo Clinic
    People with lactose intolerance are unable to fully digest the sugar (lactose) in milk As a result, they have diarrhea, gas and bloating after eating or drinking dairy products The condition, which is also called lactose malabsorption, is usually harmless, but its symptoms can be uncomfortable
  • Lactose: Uses, Health Benefits, and Lactose Intolerance
    Lactose is a natural sugar that's found in milk It is a carbohydrate Structurally, it is a disaccharide— a sugar molecule that’s composed of two simple sugars: glucose and galactose Lactose is an important source of energy for babies, and it is also commonly used in food processing and pharmaceutical drug manufacturing
  • Lactose Intolerance – Cause, Symptoms, Diagnosis, Treatment
    Lactose intolerance is the inability to digest lactose, the sugar in milk and dairy products Read on to know if you are intolerant or not
  • 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, Diagnostic Tests Treatment
    Lactose intolerance occurs in people who lack the enzyme they need to break down lactose, the sugar in milk It causes digestive distress when you eat dairy products
  • Symptoms Causes of Lactose Intolerance - NIDDK
    Overview of lactose intolerance symptoms, such as bloating, diarrhea, gas, nausea, and abdominal pain Lactose intolerance is caused by lactose malabsorption
  • Lactose Definition Meaning | U. S. Dairy
    Lactose is the natural sugar in milk and other dairy foods made from milk like yogurt and ice cream that forms when two other sugars, glucose and galactose, join together For the body to digest lactose, it uses a natural enzyme called lactase to break lactose down into these two sugars
  • Lactose Intolerance: What You Need to Know to Live a Normal Life
    Lactose intolerance is defined as having lactose malabsorption and digestive symptoms Some people may have lactose malabsorption but don’t experience symptoms, meaning they are not lactose intolerant These people can tolerate dairy products without feeling unwell
  • Lactose Intolerance Causes, Dairy Foods, Symptoms Tests
    Lactose intolerance is an inability to digest and absorb the sugar in dairy products Learn the causes, symptoms, diagnostic tests, treatment, and complications of lactose intolerance, as well as which foods and medications contain dairy





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