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Protocol status: Working
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Created: January 03, 2024
Last Modified: July 09, 2024
Protocol Integer ID: 92922
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Abstract
Tartoff, K.D. and Hobbs, C.A. (1987) Improved Media for Growing Plasmid and Cosmid Clones. Bethesda Research Laboratories Focus, 9, 12.
Guidelines
Prepare the stock solutions and autoclave separately before combining when cooled to create TB medium. The reason for this is that Glycerol is believed to react with amines in the Tryptone/Yeast extract via the Malliard reaction, leading to the formation of compounds which
Protocol materials
Bacto™ Tryptone Life TechnologiesVWR International (Avantor)Catalog #211705
20 gBacto™ Tryptone Life TechnologiesVWR InternationalCatalog #211705
4 mL Glycerol
Make up volume to 900 mL with dH2O
Autoclave 121 °C00:30:00
30m
Prepare 1L of 10x TB Salts (0.17 M KH2PO4, 0.72 M K2HPO4) by combining the following
23.1 g KH2PO4
125.4 g K2HPO4
Make up volume to 1 L with dH2O
Autoclave 121 °C00:30:00
30m
Prepare medium
Prepare medium
1h
1h
Allow solutions to cool to 60 °C or less then add
100 mL of 10x TB salts to 900 mL TB buffer.
Store at Room temperature
Practical use
Practical use
We have found that using TB for plasmid preps consistently yields higher than using LB regardless of prep kit used, with half the volume of culture required.
It is not recommended to exceed ~2 mL of saturated TB culture per prep column due to overloading the column and not yielding clean preps.