Bacterial media recipes
TB (Terrific Broth)
The following recipe can be directly autoclaved in Erlenmeyer flasks if desired.
Combine and autoclave the following components. The final 10% volume will be added afterwards.
Ingredient |
Amount per 1L final volume |
|---|---|
Tryptone |
12 g |
Yeast extract |
24 g |
Glycerol |
4 mL |
Deionized water |
900 mL |
After the mixture has cooled, add 100 mL / liter final volume of 10x TB salts and desired antibiotics.
10x TB salts
The potassium phosphate salt solution acts as a pH buffer. It must be autoclaved separately to prevent high-temperature reactions between the salts and other components of TB.
Combine the following, filling to the desired final volume with deionized water.
Ingredient |
Target concentration |
Amount per 1L final volume |
|---|---|---|
KH2PO4 |
0.17 M |
23.1 g |
K2HPO4 |
0.72 M |
125.4 g |
Note
Because we are making a fairly concentrated solution, you will need to add less than the total final volume of water (e.g. for a liter of TB salts, you may only have to add 900 mL water).
I tend to add 70% of the water, wait until all of the salt dissolves, then fill up to the relevant line on the flask. This doesn’t have to be super precise.
Autoclave the salt solution.
SOC Media
Note
We use 2x concentrated SOC for better bacterial growth. This is reflected in the amounts below.
Combine 62 g of SOC powder with deionized water to a final volume of 1 L.
Autoclave and let cool.
LB Media
Resuspend 20 g of LB Broth powder with deionized water to a final volume of 800 mL.
Autoclave and let cool.