LPS-EK (LPS from E. coli K12)

LPS-EK Unit size Cat. code Docs Qty Price
Standard LPS, E. coli K12
5 mg
LPS-EK Ultrapure Unit size Cat. code Docs Qty Price
Ultrapure lipopolysaccharide from E. coli K12
1 mg

Lipopolysaccharide from Escherichia coli K12

LPS-EK is a preparation of a rough (r)-form lipopolysaccharide (LPS) purified from the Gram-negative E. coli K12. E. coli K12 strains are the prototypical laboratory strains and are the preferred model in biochemical genetics, molecular biology, and biotechnology. LPS isolated from E. coli K12 lacks the O-antigen in its structure and is therefore considered 'rough' LPS [1]. LPS is the principal component of Gram-negative bacteria that activates the innate immune system. LPS recognition is predominantly mediated by Toll-like receptor 4 (TLR4), ultimately leading to the activation of NF-κB and the production of proinflammatory cytokines [2]. 


InvivoGen provides LPS-EK with two grades of purity:

  • LPS-EK is a standard lipopolysaccharide (LPS) preparation extracted by a phenol-water mixture. LPS-EK contains other bacterial components, such as lipoproteins, and therefore stimulates both TLR4 and TLR2.
  • LPS-EK Ultrapure is extracted by successive enzymatic hydrolysis steps and purified by the previously described phenol-TEA-DOC extraction protocol [3]. This process removes contaminating lipoproteins, and therefore LPS-EK Ultrapure only activates TLR4. 



1. Kuhnert, P. et al., 1995. Rapid and accurate identification of Escherichia coli K-12 strains. Appl Environ Microbiol 61, 4135-4139.
2. Kuzmich, N.N. et al., 2017. TLR4 Signaling Pathway Modulators as Potential Therapeutics in Inflammation and Sepsis. Vaccines (Basel) 5unol. 165(2):618-22.

3. Hirschfeld M. et al., 2000. Cutting edge: repurification of lipopolysaccharide eliminates signaling through both human and murine toll-like receptor 2. J Immunol. 165(2):618-22.

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Working concentration: 1 ng- 10 µg/ml.

Specificity: TLR4 and TLR2 agonist.

LPS-EK Ultrapure
Specificity: TLR4 agonist.

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  • 5 mg standard lipopolysaccharide from E. coli K12 (LPS-EK)
  • 1.5 ml endotoxin-free water


  • 1 mg ultrapure lipopolysaccharide from E. coli K12 (LPS-EK Ultrapure)
  • 1.5 ml endotoxin-free water

LPS-EK is shipped at room temperature.

LPS-EK should be stored at -20°C.
Upon resuspension, prepare aliquots of LPS-EK and store at 4°C for short term storage or -20 ̊C for long term storage.

Lyophilized product is stable 1 year at -20°C. Resuspended product is stable 1 month at 4°C and 6 months at -20°C.

Avoid repeated freeze-thaw cycles.

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