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D-Lactose monohydrate

≥98.0% (HPLC)

4-O-β-D-Galactopyranosyl-D-glucose, Milk sugar, β-D-Gal-(1→4)-D-Glc
Empirical Formula (Hill Notation):
C12H22O11 · H2O
CAS Number:
Molecular Weight:
EC Number:
MDL number:
PubChem Substance ID:

Quality Level


≥98.0% (HPLC)



optical activity

[α]20/D +52±2°, 22 hr, c = 10% in H2O


H2O: 0.1 g/mL, clear, colorless (warm)

SMILES string




Inchi Key


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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%. The enzyme lactase hydrolyzes lactose to its constituent monosaccharides. In neonates, glucose released via the action of lactase is a major energy source.

Other Notes

Sales restrictions may apply

Storage Class Code

13 - Non Combustible Solids



Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificate of Analysis

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Certificate of Origin

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