UA Biophysics:Protocols:Competent Cells: Difference between revisions
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(New page: COMPETENT CELLS PROTOCOL 1.Grow an ON in LB media (the day before) 2.Dilute the ON at least 1/100, into 20-25mL in an 200mL Erlenmeyer 3.Grow the diluted bacteria until they reach an OD60...) |
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==Material== | |||
* [https://openwetware.org/wiki/TSS TSS Buffer ] | |||
* Overnight (E.coli MG1655) | |||
* LB 25mL in a 200mL Erlenmeyer | |||
* Sterile epperdorfs | |||
==Protocol== | |||
'' | #Grow an ON in LB media (the day before) | ||
#Dilute the ON at least 1/100, into 20-25mL in a 200mL Erlenmeyer | |||
#Grow the diluted bacteria until they reach an OD600 between 0.2 and 0.5 | |||
#Put the eppendorfs in ice, to make sure they are cold | |||
#Check that the TSS Buffer is also cold | |||
#Take the culture and separate it into two 50mL falcon tubes. | |||
#Leave the falcon tubes on ice during 10 min. | |||
#: | |||
#:'''The following steps should be carried out at 4°C and cells should be left on ice whenever possible''' | |||
#: | |||
#Centrifuge during 10 min at 3000rmp and 4°C | |||
#Remove the supernatant and make the best effort to remove all the remaining media by using pipettes. | |||
#Resuspend the centrifuged cells in TSS Buffer. The recommended amount of TSS Buffer for this step is about 10% of the volume that was centrifuged. | |||
#Distribute the resuspended volume into eppendorfs in aliquots of 100uL. | |||
#Store the competent cells in a -80°C freezer. | |||
[[UA Biophysics:Protocols|Return to Protocols]]<br> | |||
Latest revision as of 13:09, 29 June 2023
Material
- TSS Buffer
- Overnight (E.coli MG1655)
- LB 25mL in a 200mL Erlenmeyer
- Sterile epperdorfs
Protocol
- Grow an ON in LB media (the day before)
- Dilute the ON at least 1/100, into 20-25mL in a 200mL Erlenmeyer
- Grow the diluted bacteria until they reach an OD600 between 0.2 and 0.5
- Put the eppendorfs in ice, to make sure they are cold
- Check that the TSS Buffer is also cold
- Take the culture and separate it into two 50mL falcon tubes.
- Leave the falcon tubes on ice during 10 min.
- The following steps should be carried out at 4°C and cells should be left on ice whenever possible
- Centrifuge during 10 min at 3000rmp and 4°C
- Remove the supernatant and make the best effort to remove all the remaining media by using pipettes.
- Resuspend the centrifuged cells in TSS Buffer. The recommended amount of TSS Buffer for this step is about 10% of the volume that was centrifuged.
- Distribute the resuspended volume into eppendorfs in aliquots of 100uL.
- Store the competent cells in a -80°C freezer.