SOC Medium

For use in transformation


Quality Level


for molecular biology


0.2 μm filtered




Dextrose, 3.603 g/L
KCl, 0.186 g/L
MgSO4, 4.8 g/L
Tryptone, 20 g/L
Yeast extract, 5 g/L

Featured Industry

Food and Beverages

storage temp.



nonselective for Escherichia coli
nonselective for coliforms

Related Categories

General description

SOC is a microbial growth medium used for the transformation of competent cells (E. coli). This nutrient-rich microbial broth contains peptides, amino acids, water-soluble vitamins, and glucose in a low-salt formulation.


SOC Medium is a rich media used primarily in the recovery step of Escherichia coli competent cell transformations. Use of SOC maximizes the transformation efficiency of competent cells.

Features and Benefits

SOC liquid provides:
  • Filter-sterilized, ready-to-use format
  • Convenient package sizes
  • Standard formulation

Preparation Note

1. Suspend 31.3 g in 1 L of distilled water.
2. Autoclave for 15 minutes at 121°C.


NONH for all modes of transport

WGK Germany


Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis
Certificate of Origin
  1. Which document(s) contains shelf-life or expiration date information for a given product?

    If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis.

  2. How do I get lot-specific information or a Certificate of Analysis?

    The lot specific COA document can be found by entering the lot number above under the "Documents" section.

  3. How do I find price and availability?

    There are several ways to find pricing and availability for our products. Once you log onto our website, you will find the price and availability displayed on the product detail page. You can contact any of our Customer Sales and Service offices to receive a quote.  USA customers:  1-800-325-3010 or view local office numbers.

  4. What is the Department of Transportation shipping information for this product?

    Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product. 

  5. Which bacterial culture medium is the best choice for my application?

    Each of the broths will likely grow E. coli very well, but there are still general guidelines for choosing a broth when you are working without a protocol. Generally:LB - Miller and LB - Lennox are used for E. coli growth and maintanence, DNA plasmid production and protein production.  The Lennox formulation has a lower salt content required for some salt-sensitive selection antibiotics.LB - Luria low salt is used for special applications where the E. coli growth or other constraints require the lowest possible salt content.Terrific Broth is used for higher yield protein production and high yield DNA plasmid production, because of the faster growth of the E. coli in this medium.SOB is used for protein production, DNA plasmid production and the generation of high-efficiency competent cells.SOC is used for initial growth of competent cells and the transformation procedure.

  6. Why is SOC Medium (S1797) used to recover bacterial cells before transformation?

    SOC is a rich bacterial broth that also contains glucose, which aids in the recovery process and prepares the cells for efficient transformation.  The use of other media, such as LB - Lennox may also be acceptable, but the recovery and transformation may not be as efficient.

  7. My question is not addressed here, how can I contact Technical Service for assistance?

    Ask a Scientist here.

  8. My question is not addressed here, how can I contact Technical Service for assistance?

    Ask a Scientist here.

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General protocols for growth of competent cells and their transformation (uptake of DNA).
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Technical Article on competent cells. Transformation is a process by which some bacteria take up foreign genetic material (naked DNA) from the environment.
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General protocols for growth of competent cells in microbial medium.
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