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Lactose

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Lactose (Milk succar)
Names
IUPAC name
β-D-galactopyranosyl-(1→4)-D-glucose
Ither names
Milk succar
4-O-β-D-galactopyranosyl-D-glucose
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
UNII
Properties
C12H22O11
Molar mass 342.30 g/mol
Appearance white solid
Density 1.525 g/cm3
Meltin pynt 202.8 °C[1]
Bylin pynt 668.9 °C[1]
21.6 g/100 mL[2]
Thermochemistry
Std enthalpy o
combustion
ΔcHo298
5652 kJ/mol, 1351 kcal/mol, 16.5 kJ/g, 3.94 kcal/g
Hazards
NFPA 704
NFPA 704 four-colored diamondFlammability code 0: Will nae burn. E.g., watterHealth code 1: Exposur would cause irritation but anly minor residual injury. E.g., turpentineReactivity code 0: Normally stable, even unner fire exposur condeetions, an is nae reactive wi watter. E.g., liquid nitrogenSpecial hazards (white): no code
0
1
0
Flash pynt 357.8 °C[1]
Except whaur itherwise notit, data are gien for materials in thair staundart state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Lactose is a disaccharide succar derived frae galactose an glucose that is foond in milk. Lactose maks up aroond 2~8% o milk (bi wicht), altho the amoont varies amang species an individuals. It is extractit frae sweet or sour whey. The name comes frae lac or lactis, the Latin wird for milk, plus the -ose endin uised tae name succars. It haes a formula o C12H22O11.

References

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  1. a b c Anonymous. Sigma Aldrich. Lactose Product. https://www.sigmaaldrich.com/US/en/product/sial/17814 St. Louis MO.
  2. The solubility of lactose in water is 18.9049 g at 25 °C, 25.1484 g at 40 °C and 37.2149 g at 60 °C per 100 g solution. Its solubility in ethanol is 0.0111 g at 40 °C and 0.0270 g at 60 °C per 100 g 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