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D-Lactose monohydrate

Name: <SC>D</SC>-Lactose monohydrate
Brand: SIGMA

≥99% (HPLC), BioUltra

Synonym(s):

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

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About This Item

Empirical Formula (Hill Notation):

C₁₂H₂₂O₁₁ · H₂O

CAS Number:

64044-51-5

Molecular Weight:

360.31

UNSPSC Code:

12352201

NACRES:

NA.25

PubChem Substance ID:

329759435

EC Number:

200-559-2

Beilstein/REAXYS Number:

3768231

MDL number:

MFCD00166994

Pricing and availability is not currently available.

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Properties

product line

BioUltra

Quality Level

100

assay

≥99% (HPLC)

form

solid

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)

color

colorless

pH

3.5-6.0 (25 °C, 0.5 M in H₂O)

solubility

H₂O: 0.5 M at 20 °C, clear, colorless

anion traces

chloride (Cl^-): ≤50 mg/kg, sulfate (SO₄^2-): ≤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 A_max: 0.02, λ: 280 nm A_max: 0.02

SMILES string

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

InChI

1S/C12H22O11.H2O/c13-1-4(16)7(18)11(5(17)2-14)23-12-10(21)9(20)8(19)6(3-15)22-12;/h1,4-12,14-21H,2-3H2;1H2/t4-,5+,6+,7+,8-,9-,10+,11+,12-;/m0./s1

InChI key

HBDJFVFTHLOSDW-XBLONOLSSA-N

Description

Application

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.

Other Notes

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

Sales restrictions may apply

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

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Show Differences

1 of 1

This Item	61341	L254	PHR1024
Sigma-Aldrich 61339 D-Lactose monohydrate	Sigma-Aldrich 61341 D-Lactose monohydrate	Sigma-Aldrich L254 D-Lactose monohydrate	Supelco PHR1024 Lactose (Monohydrate)
assay ≥99% (HPLC)	assay -	assay -	assay -
solubility H₂O: 0.5 M at 20 °C, clear, colorless	solubility -	solubility -	solubility -
Quality Level 100	Quality Level 200	Quality Level 200	Quality Level 300
form solid	form solid	form powder	form -
impurities insoluble matter, passes filter test	impurities -	impurities dextrose, passes test, sucrose, passes test, ≤0.005% insolubles, 4.0-6.0% water	impurities -
cation traces Al: ≤5 mg/kg, Ba: ≤5 mg/kg, Ca: ≤10 mg/kg, Co: ≤5 mg/kg, Cu: ≤5 mg/kg, K: ≤50 mg/kg, Mg: ≤5 mg/kg, Mo: ≤5 mg/kg, Ni: ≤5 mg/kg, Sr: ≤5 mg/kg, As: ≤0.1 mg/kg, Cd: ≤5 mg/kg, Fe: ≤5 mg/kg, Mn: ≤5 mg/kg, Pb: ≤5 mg/kg, Bi: ≤5 mg/kg, Li: ≤5 mg/kg, Zn: ≤5 mg/kg, Cr: ≤5 mg/kg, Na: ≤50 mg/kg	cation traces -	cation traces Fe: ≤5 ppm, heavy metals: ≤5 ppm (by ICP)	cation traces -

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Storage Class

11 - Combustible Solids

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Eyeshields, Gloves, type N95 (US)

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Separation behaviour of some isomeric organic compounds on sugars, sugar alcohols and their mixed phases by gas-liquid chromatography.

Ono, A.

Journal of Chromatography A, 197, 251-251 (1980)

Coat formation of surface-active proteins on aqueous surfaces during drying.

J Nijdam et al.

Colloids and surfaces. B, Biointerfaces, 123, 53-60 (2014-09-30)

Segregation of the protein bovine serum albumin (BSA) and lactose in thin aqueous films during drying was investigated by examining the composition of the dried films using inverse micro Raman spectroscopy (IMRS) and X-ray photoelectron spectroscopy (XPS) sputter-depth profiling. The

Hiding a realistic object using a broadband terahertz invisibility cloak.

Fan Zhou et al.

Scientific reports, 1, 78-78 (2012-02-23)

The invisibility cloak has been a long-standing dream for many researchers over the decades. Using transformation optics, a three-dimensional (3D) object is perceived as having a reduced number of dimensions, making it "undetectable" judging from the scattered field12345. Despite successful

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Global Trade Item Number

SKU	GTIN
61339-25G	04061832699905
61339-100G	04061832699868
61339-250G	04061832699899

Questions

1–2 of 2 Questions

Anonymous

10 months ago

How can I determine the shelf life / expiration / retest date of this product?

1 answer
1. Technical Support
  
  10 months ago
  
  If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
  For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
  For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
  For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/418/501/product-dating-information-06-25-mk.pdf
  
  Helpful?
Anonymous

a year ago

How is shipping temperature determined? And how is it related to the product storage temperature?

1 answer
1. Technical Support
  
  a year ago
  
  Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf
  
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