Currently, we use Caulfield's solution as our fixative while microwave processing our samples. In Caulfield's Buffer Stock A, we use sodium barbital and sodium acetate 3H20. We are finally running low on sodium barbital (last container is from 2010) and I am in the process of ordering more. Since it is a controlled substance, I was asked to see if there are any substitutions. I was wondering what other options, if any, are out there. I am fairly new to the EM world, so I am learning along the way. Any information would be very helpful! Thanks much!
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Hello,
Hopefully this can get you started. I would use a 2.5% glutaraldehyde and 2% formaldehyde in 0.1M phosphate buffer with a pH of 7.2.
For fixation of cells, add fixative at 2x concentration 1:1 to the cell media. Leave it for 1 hour at RT. If the cells grow in suspension, spin them down in the fixative at 3000rpm for 3 minutes. Leave it for 1 hour at RT in the fixative.
For fixation of tissue, perfusion fixation is preferred. For this, we recommend using 2% formaldehyde and 2.5 glutaraldehyde in 0.1M phosphate buffer, pH of 7.2. After perfusion, dissect out the tissue of interest, immerse in fresh fixative and cut into 1-2mm cubes, then leave it to fix at least 2 hours at RT.
Bring your fixed samples to the EM lab in the fixative, and then wash in phosphate buffer 3x 1% osmium tetroxide (in H2O), then leave for 1 hour at RT.
I hope this helps! Please let us know if we can be of any further assistance.
-Electron Microscopy Sciences
Hello!
Caulfield's is somewhat outdated, and most labs do not rely on it anymore. Most people use a combination of osmium with glut and a phosphate buffer. Sodium barbital is going to be very hard for you to get anymore without licensing, so this may be a better option for you.
Good luck and let us know if there is anything else we can do to help!
-Electron Microscopy Sciences