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L2755

Sigma-Aldrich

Lipopolysaccharides from Escherichia coli O128:B12

purified by phenol extraction

Synonym(s):
LPS
EC Number:
MDL number:
NACRES:
NA.25

Quality Level

biological source

Escherichia coli (O128:B12)

form

lyophilized powder

purified by

phenol extraction

impurities

<3% Protein (Lowry)

shipped in

ambient

storage temp.

2-8°C

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General description

This product is phenol extracted from E. coli serotype O128:B12. The source strain is CDC 2440-69.

Packaging

10 mg in poly bottle
100 mg in glass bottle

Application

Lipopolysaccharides (LPSs) are characteristic components of the cell wall of Gram-negative bacteria. LPS and its lipid A moiety stimulate cells of the innate immune system by the Toll-like receptor 4 (TLR4), a member of the Toll-like receptor protein family, which recognizes common pathogen-associated molecular-patterns (PAMPs).

Biochem/physiol Actions

Lipopolysaccharides (LPS) are localized in the outer layer of the membrane and are, in noncapsulated strains, exposed on the cell surface. They contribute to the integrity of the outer membrane, and protect the cell against the action of bile salts and lipophilic antibiotics.

Preparation Note

The product is soluble in water (5 mg/ml) or cell culture medium (1 mg/ml) yielding a hazy, faint yellow solution. A more concentrated, though still hazy, solution (20 mg/ml) has been achieved in aqueous saline after vortexing and warming to 70-80 oC. Lipopolysaccharides are molecules that form micelles in every solvent. Hazy solutions are observed in water and phosphate buffered saline. Organic solvents do not give clearer solutions. Methanol yields a turbid suspension with floaters, while water yields a homogeneously hazy solution.

Pictograms

Skull and crossbones

Signal Word

Danger

Hazard Statements

Hazard Classifications

Acute Tox. 2 Oral

Storage Class Code

6.1A - Combustible, acute toxic Cat. 1 and 2 / very toxic hazardous materials

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis

Certificate of Origin

Yijing Su et al.
Journal of applied toxicology : JAT, 34(12), 1436-1442 (2014-10-22)
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Previous reports indicate that ethanol, in a binge drinking model in mice, inhibits the production of pro-inflammatory cytokines in vivo. However, the inhibition of signaling through TLR4 has not been investigated in this experimental model in vivo. Considering evidence that
Elena A Khatuntseva et al.
Beilstein journal of organic chemistry, 8, 763-775 (2012-09-28)
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Ester Zito et al.
Molecular cell, 40(5), 787-797 (2010-12-15)
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