• G418 disulfate, EvoPure packaged and labeled.

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SKU: G030

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G418 Disulfate, EvoPure® is a highly pure (≥ 99.0%) version of our G418 Disulfate.  It has been purified to remove the impurities commonly present in G418 Disulfate (G001).  This aminoglycoside antibiotic originally isolated from Micromonospora rhodorangea  is routinely used for gene selection in cell culture.

We also offer:

  • G418 Disulfate Solution (50 mg/ml in Water)(G020-G021
  • G418 Disulfate (G001)

    CAS Number


    Molecular Formula

    C20H40N4O10 · xH2SO4 (lot specific)

    Molecular Weight

    496.55 g/mol (Free base)

    Mechanism of Action

    G418 disulfate, and other aminoglycosides, including kanamycin and neomycin, prevent protein synthesis by blocking the elongation step in prokaryotic and eukaryotic ribosomes.

    Mechanism of resistance:

    Resistance to G418 sulfate is conferred by the neo gene (neomycin resistant gene) from either Tn5 or Tn601 (903) transposons. Cells successfully transfected with resistance plasmids containing the neo resistance gene can express aminoglycoside 3'-phosphotransferase (APT 3' I or APT 3' II) which covalently modifies G418 to 3-phosphoric G418. 3-phosphoric G418 has negligible potency and has low-affinity for prokaryotic or eukaryotic ribosomes.

    Storage Conditions


    Tariff Code



    G418 Disulfate is toxic to susceptible bacteria and fungi.


    Eukaryotic Cell Culture Applications

    G418 Disulfate is routinely used as a selection agent in cell culture after transfection of eukaryotic cells.   Resistant cells express the neo gene which produces aminoglycoside 3'-phosphotransferase (APT 3' I or APT 3' II), a protein that confers resistance to G418 Disulfate and other aminoglycoside antibiotics.

    Optimal working concentrations:

        • Mammalian cell lines:  200 mg/L – 1000 mg/L
        • Bacteria and algae:  ≤5 mg/L

    The optimal working concentration of G418 sulfate to select for resistant clones depends on the cell line, reagent quality, reagent lot, media, growth conditions, cell density, cell metabolic rate, cell cycle phase, and plasmid quality.  A kill curve should  be performed to determine the optimal  concentration for each experimental system.

    Use the following guide to determine the concentration to use to generate a kill curve:

        • 5 mg/L - 1400 mg/L (mammalian cells)
        • 0.1 mg/L - 50 mg/L (bacteria and algae)

    A working concentration of 200 mg/L is usually sufficient after resistant mammalian clones are selected and can be used for maintenance until stable resistant clones are selected.

    The Selectivity Factor is a quantifiable measure of how efficient an antibiotic is during the process of gene selection.   TOKU-E scientists tested the selectivity factor of G418 for BHK-21 cells and HeLa cells.  Authors found that G418 is an ideal selection antibiotic for transfected BHK-21 cells but not optimal for HeLa cells.  The method uses a modified MTT assay, which can be used to numerically determine the antibiotic efficiency (Delrue I et al, 2018).   For more information about the Selectivity Factor, click here.

    For more information on relevant cell lines, culture medium, and working concentrations, please visit the TOKU-E Cell-culture Database.

    Microbiology Applications

    G418 Disulfate is used as a gene selection agent during transfection of eukaryotic cells.





    Biosynthetic: produced by Micromonospora rhodorangea.


    1mg/ml (water): 280nm <0.015 570nm <0.01 100mg/ml (water): 570nm <0.01 1.74g/25 ml (water): 280nm <0.7



Technical Data

Spectral Data - G418 disulfate, EvoPure®

HNMR Spectra


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Solvent: D2O
Instrument: Mercury 300
Frequency: 300 MHz


FTIR Spectra

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Mass Spectra

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Polarity/Scan Type: Positive
Solvent: Water
Solution Concentration: 10 mg/mL


    Aragão FJL and Brasileiro ACM (2002)  Positive, negative and marker-free strategies for transgenic plant selection. Braz. J. Plant Physiol. 14(1):1-10

    Davis BD (1987)  Mechanism of bactericidal action of aminoglycosides.  Microbiol. Rev. 51(3):341-50

    Delrue I, Pan Q, Baczmanska AK, Callens BW and Verdoodt LLM (2018)   Determination of the selection capacity of antibiotics for gene selection.   Biotechnol. J. 13(8):1700747  PMID 29436782

    Lin-Cereghino J et al (2008)  Direct selection of Pichia pastoris expression strains using new G418 resistance vectors.  Yeast 25:293-299

    Shin Y (2007)  Selection of NptII transgenic sweet potato plants Using G418 and paromomycin.  J. Plant Biol. 50(2):206-212

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