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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
    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 - Verywell Health
    Lactose is a natural sugar that's present in dairy foods It also has a number of uses in the food processing and pharmaceutical industries While lactose has many health benefits for babies in their development stage, adults can do without it
  • 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
  • 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
    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
  • 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
  • Symptoms Causes of Lactose Intolerance - NIDDK
    If you have lactose intolerance, you may have symptoms within a few hours after you have foods or drinks that contain lactose What causes lactose intolerance? Lactose intolerance is caused by lactose malabsorption
  • Lactose Intolerance Causes, Dairy Foods, Symptoms Tests - MedicineNet
    Lactose is a sugar molecule that is made up of two smaller sugars, glucose and galactose For lactose to be absorbed from the intestine and into the body, it must first be split into glucose and galactose The glucose and galactose are then absorbed by the cells lining the small intestine
  • Understanding Lactose: Comprehensive Guide to Its Roles
    "The lactose intolerance conversation extends beyond personal comfort; it invites us to consider the social and cultural implications of lactose digestion across societies " In summary, lactose intolerance serves as a window into understanding nutritional health, dietary preferences, and cultural patience with dairy products





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