User:Puja Mody/Notebook/Chem 571: Gold Nanoparticles/2012/09/19

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Protein Expression.


  • Induce Protein expression.
  • make the binding buffer and the elution buffer
  • Continue running AuNP tests-
  • Harvest the cells that were grown.


  • Protein Expression
  1. This morning at 8 am, the starter cultures were centrifuged at 4500 rpm for 15 minutes and then resuspended the cell pellets in 4mL of fresh LB.
  2. Inoculate the expression culture media by dividing the resuspended cells among the Fernbach flasks.
  3. Incubate the expression cultures at 37C and 160rpm until the absorbance of the media at 600nm = 0.6.
  4. Add 1mL of 0.4M IPTG to each flask in order to induce protein expression
  5. Continue shaking for 3-4 hours
  6. Harvest the cells by centrifuging at 4500rpm for 15 minutes


  • sample 1 looked a little different when the samples were looked at this morning prior to centrifuging. It was a different shade of yellow in the erlenmeyer flask.