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61339 Sigma

D-Lactose monohydrate

BioUltra, ≥99.5% (HPLC)

Synonym: β-D-Gal-(1→4)-D-Glc, 4-O-β-D-Galactopyranosyl-D-glucose, Milk sugar

  • CAS Number 64044-51-5

  • Empirical Formula (Hill Notation) C12H22O11 · H2O

  • Molecular Weight 360.31

  •  Beilstein Registry Number 3768231

  •  EC Number 200-559-2

  •  MDL number MFCD00166994

  •  PubChem Substance ID 329759435



Related Categories BioUltra, Biochemicals and Reagents, Biostabilization Agents, Carbohydrates, Disaccharide,
product line   BioUltra
assay   ≥99.5% (HPLC)
optical activity   [α]20/D +53±1°, 22 hr, c = 10% in H2O
impurities   insoluble matter, passes filter test
ign. residue   ≤0.05% (as SO4)
pH   3.5-6.0 (25 °C, 0.5 M in H2O)
solubility   H2O: soluble0.5 M at 20 °C, clear, colorless
anion traces   chloride (Cl-): ≤50 mg/kg
  sulfate (SO42-): ≤50 mg/kg
cation traces   Al: ≤5 mg/kg
  As: ≤0.1 mg/kg
  Ba: ≤5 mg/kg
  Bi: ≤5 mg/kg
  Ca: ≤10 mg/kg
  Cd: ≤5 mg/kg
  Co: ≤5 mg/kg
  Cr: ≤5 mg/kg
  Cu: ≤5 mg/kg
  Fe: ≤5 mg/kg
  K: ≤50 mg/kg
  Li: ≤5 mg/kg
  Mg: ≤5 mg/kg
  Mn: ≤5 mg/kg
  Mo: ≤5 mg/kg
  Na: ≤50 mg/kg
  Ni: ≤5 mg/kg
  Pb: ≤5 mg/kg
  Sr: ≤5 mg/kg
  Zn: ≤5 mg/kg
λ   0.5 M in H2O
UV absorption   λ: 260 nm Amax: 0.02
  λ: 280 nm Amax: 0.02


Other Notes

Component of the liquid stationary phase in the GLC separation of nitroxylene and xylenol isomers

Sales restrictions may apply


D-Lactose is a disaccharide of D-glucose and D-galactose units found as a major sugar in milk. D-Lactose is used for the culture of lactic acid metabolizing bacteria, lactic acid bacteria. D-Lactose is used to identify and characterized galectins.

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.

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Suggested Laboratory Gloves

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Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 
Protocols & Articles


MSMLS Online Plate Map

Metabolite descriptors included with the software download upon purchase of the product include: Name, Parent CID, molecular formula, molecular weight, CAS, ChEBI, HMDB ID, PubChem Compound and Subst...
Keywords: Mass spectrometry, Metabolites

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