How do you make paraformaldehyde in PBS?

How do you make paraformaldehyde in PBS?

For a 4% paraformaldehyde solution, add 4 g of EM grade paraformaldehyde to 50 mL of H2O. Add 1 mL of 1 M NaOH and stir gently on a heating block at ~60°C until the paraformaldehyde is dissolved. Add 10 mL of 10X PBS and allow the mixture to cool to room temperature.

How do you get 4% PFA on PBS?


  1. For 1 L of 4% Formaldehyde, add 800 mL of 1X PBS to a glass beaker on a stir plate in a ventilated hood.
  2. Add 40 g of paraformaldehyde powder to the heated PBS solution.
  3. The powder will not immediately dissolve into solution.
  4. Once the paraformaldehyde is dissolved, the solution should be cooled and filtered.

How is paraformaldehyde formed?

Paraformaldehyde is the solid form of liquid formaldehyde, formed by the polymerization of formaldehyde with a typical degree of polymerization of 8-100 units. Since paraformaldehyde is basically a condensed form of formaldehyde, it possesses the same characteristics but with a wider range of applications.

How do you make 4% formaldehyde from 37 Formaldehyde?

Formaldehyde solution 4 %: Mix 1 part of formaldehyde solution min. 37%, Cat. No. 103999 with 9 parts distilled water or buffer solution (dilution 1:10).

How do you make 2 paraformaldehyde?

2% Paraformaldehyde Fixative

  1. 900ml dd H2O + 500µl 1N NaOH.
  2. Heat to 65° – 70°C.
  3. While stirring, add 20g paraformaldehyde.
  4. Continue heating and stirring until paraformaldehyde is dissolved.
  5. Let cool to room temperature.
  6. Add 100ml of 10X PBS.
  7. pH to 7.3 with HCl.
  8. Sterile filter.

What is paraformaldehyde fixation?

Paraformaldehyde causes covalent cross-links between molecules, effectively gluing them together into an insoluble meshwork. The reason cells must be fixed prior to immunostaining is quite simple. You need to permeabilize cells to allow antibodies to access intracellular structures.

What is the purpose of paraformaldehyde?

Paraformaldehyde (PFA) has been widely used as a cross-linking fixation agent. It has been empirically recognized in a gold standard protocol that the PFA concentration for cell fixation, C PFA, is 4%.

What is the use of paraformaldehyde?

Paraformaldehyde is used as a disinfectant, hardening agent and waterproofing agent. It is also used to prepare adhesives, resins and in dentistry as an antiseptic. It is also employed as a thermoplastic.

What is paraformaldehyde soluble in?

Paraformaldehyde is made up of connected formaldehyde molecules. Paraformaldehyde is slightly soluble in alcohols and insoluble in ethers, hydrocarbons, and carbon tetrachloride. It is relative insoluble in cold water, but soluble in hot water with depolymerization.

How does paraformaldehyde fix tissue?

Alcohol based fixations dehydrate cells/tissues, causing proteins to denature and precipitate in situ. Paraformaldehyde causes covalent cross-links between molecules, effectively gluing them together into an insoluble meshwork.

How do you make paraformaldehyde solution?


  1. Take 800 mL of 1X PBS.
  2. Add 40 g of Paraformaldehyde powder to 1X PBS.
  3. Stir the mixture at 60˚C in ventilation hood (DO NOT Boil).
  4. PFA powder does not dissolve instantly, you need to raise the pH of the mixture by adding 5N NaOH drop by drop until a clear solution is formed.