Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Chemical compound
Lactose, or milk sugar, is a disaccharide sugar composed of galactose and glucose subunits and has the molecular formula C12H22O11. 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 taste. It is used in the food industry.[5]
^ abPeter M. Collins (2006). Dictionary of Carbohydrates (2nd ed.). Boca Raton: Chapman & Hall/CRC. p. 677. ISBN 978-0-8493-3829-8.
^"D-Lactose".
^The solubility of lactose in water is 189.049 g at 25 °C, 251.484 g at 40 °C and 372.149 g at 60 °C per kg solution. Its solubility in ethanol is 0.111 g at 40 °C and 0.270 g at 60 °C per kg solution.Machado, José J. B.; Coutinho, João A.; Macedo, Eugénia A. (2001), "Solid–liquid equilibrium of α-lactose in ethanol/water" (PDF), Fluid Phase Equilibria, 173 (1): 121–34, doi:10.1016/S0378-3812(00)00388-5.
ds
^Sigma Aldrich
^Gerrit M. Westhoff; Ben F.M. Kuster; Michiel C. Heslinga; Hendrik Pluim; Marinus Verhage (2014). "Lactose and Derivatives". Ullmann's Encyclopedia of Industrial Chemistry. Wiley-VCH. pp. 1–9. doi:10.1002/14356007.a15_107.pub2. ISBN 978-3-527-30673-2.
Lactose, or milk sugar, is a disaccharide sugar composed of galactose and glucose subunits and has the molecular formula C12H22O11. Lactose makes up around...
Lactose intolerance is caused by a lessened ability or a complete inability to digest lactose, a sugar found in dairy products. Humans vary in the amount...
The lactose operon (lac operon) is an operon required for the transport and metabolism of lactose in E. coli and many other enteric bacteria. Although...
the lactose naturally found in milk, leaving it slightly sweet but digestible by everyone. Without lactase, lactose intolerant people pass the lactose undigested...
February is the second month of the year in the Julian and Gregorian calendars. The month has 28 days in common years or 29 in leap years, with the 29th...
lactose down into glucose and galactose. As a result of the fermentation, lactose levels are decreased by 20–30% with respect to the initial lactose levels...
activity of the lactase enzyme in adulthood, allowing the digestion of lactose in milk. In most mammals, the activity of the enzyme is dramatically reduced...
Lactose permease is a membrane protein which is a member of the major facilitator superfamily. Lactose permease can be classified as a symporter, which...
varying degrees. Some people avoid some or all dairy products because of lactose intolerance, veganism, environmental concerns, other health reasons or...
intestinal tract) bacteria and differentiate them based on lactose fermentation. Lactose fermenters turn red or pink on MacConkey agar, and nonfermenters...
and galactooligosaccharides (GOS, stachyose, raffinose), disaccharides (lactose), monosaccharides (fructose), and sugar alcohols (polyols), such as sorbitol...
Milk contains many nutrients, including calcium and protein, but also lactose and saturated fat. As an agricultural product, dairy milk is collected...
people with lactose malabsorption. Lactose intolerance is a condition in which people have symptoms due to the decreased ability to digest lactose, a sugar...
of glucose. A galactose molecule linked with a glucose molecule forms a lactose molecule. Galactan is a polymeric form of galactose found in hemicellulose...
coding for proteins involved in the metabolism of lactose in bacteria. These genes are repressed when lactose is not available to the cell, ensuring that the...
six-carbon sugars (also, disaccharides of six-carbon sugars, e.g. sucrose or lactose) are converted into cellular energy and the metabolite lactate, which is...
Lactose synthase is an enzyme that generates lactose from glucose and UDP-galactose. It is classified under EC 2.4.1.22. It consists of N-acetyllactosamine...
particularly important to consumers who suffer from cow's milk allergies, lactose intolerances or hypercholesterolemia. Individuals who adhere to dairy-free...
cheeses, about 50% of milk solids remain in the whey, including most of the lactose and lactalbumin. The production of whey cheese allows cheesemakers to use...
bacteria that ferment lactose (e.g., E. coli) from those that do not (e.g., Salmonella, Shigella). Organisms that ferment lactose appear dark/black or...
sugars, e.g. fructose (fruit sugar), sucrose (cane or beet sugar), ribose, lactose (milk sugar), etc. Carbohydrates perform numerous roles in living organisms...
while sour whey contains about 0.1% fat. The carbohydrates are mainly lactose. The proteins are known as lactalbumin. Whey also contains some minerals...
('hydrolysed lactose') and refers to the low lactose content of HYLA milk products. Milk products with the HYLA label contain less than 1% lactose, so they...
are simple sugars soluble in water. Three common examples are sucrose, lactose, and maltose. Disaccharides are one of the four chemical groupings of carbohydrates...
based on lactose fermentation abilities. Strong lactose fermenters will appear as dark blue/purple/black, and E.coli (which also ferments lactose) colonies...
forsythia flowers produce lactose, but lactose occurs only very rarely in natural sources other than milk, and attempts to find lactose in forsythia have been...
lactose. It consists of the monosaccharides D-galactose and D-glucose linked through a β1-6 glycosidic linkage instead of the β1-4 linkage of lactose...
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