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L3625

Sigma-Aldrich

α-Lactose monohydrate

≥99% total lactose basis (GC)

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Synonym(s):
β-D-Gal-(1→4)-α-D-Glc, 4-O-β-D-Galactopyranosyl-α-D-glucose, Milk sugar
Empirical Formula (Hill Notation):
C12H22O11 · H2O
CAS Number:
5989-81-1
Molecular Weight:
360.31
MDL number:
MFCD00150747
PubChem Substance ID:
57654326
NACRES:
NA.25

biological source

bovine milk

Quality Level

200

Assay

≥99% total lactose basis (GC)

form

powder

impurities

≤0.05% Glucose
≤4% β-lactose

color

white to off-white

mp

219  °C ((426 °F ))

solubility

water: 100 mg/mL, clear, colorless

storage temp.

room temp

SMILES string

[H]O[H].OC[C@H]1O[C@@H](O[C@H]2[C@H](O)[C@@H](O)[C@@H](O)O[C@@H]2CO)[C@H](O)[C@@H](O)[C@H]1O

InChI

1S/C12H22O11.H2O/c13-1-3-5(15)6(16)9(19)12(22-3)23-10-4(2-14)21-11(20)8(18)7(10)17;/h3-20H,1-2H2;1H2/t3-,4-,5+,6+,7-,8-,9-,10-,11+,12+;/m1./s1

InChI key

WSVLPVUVIUVCRA-KPKNDVKVSA-N

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Biochem/physiol Actions

Lactose is a dissacharide formed by the condensation of one galactose and one glucose molecule. Lactose is the major sugar in the milk of most species, typically present between 2-8%.
alpha-Lactose is the primary sugar present in milk and the main energy source to a newborn mammalian through its mother′s milk. It is digested by the intestinal lactase (EC 3.2.1.108), an enzyme expressed in newborns. The enzyme′s activity declines following weaning which can lead to lactose intolerance in adult mammals.

Other Notes

To gain a comprehensive understanding of our extensive range of Disaccharides for your research, we encourage you to visit our Carbohydrates Category page.

Storage Class Code

11 - Combustible Solids

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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