On the meeting we had a discussion on bacteria lysis. Some of you use the Thermo Fisher BPER Reagent, which is really expensive.
There are some much cheaper alternatives to that, I found a good summary with protocols on the EMBL page: https://www.embl.de/pepcore/pepcore_services/protein_purification/extraction_clarification/cell_lysates_ecoli/
It says on the Thermo Fisher page, that this reagent is “Detergent in Tris buffer with Lysozyme and Universal Nuclease” and the safety sheets just show >=1 -<2.5% of Triton X-100 in it. I guess it should be easily exchangeable by home-brew recipies and protocols and you don’t need to buy it. pH of this reagent is 7.6.
An alternative protocol can be this one:
You can try adding Triton X-100 in the same concentration range and you can use AEBSF instead of PMSF, which is less toxic. Also the use of 1mM EDTA is for gram negative strains (like BL21) recommended (but not compatible with Ni2+ affinity purification or Mg2+ dependend enzymes like DNA polymerases! But you can also freeze them in PBS)
A good starting point to develop your own protocol is here:
Have a good day!