This material is miscible with water, methanol, ethanol, acetone, acetic acid, dioxane, ethylene glycol, glycerol, and phenol. This product has not been deionized, which is required for use in molecular biology applications. For use in nucleic acid hybridization and in gel loading solution, the following protocol is suggested for deionization:
1. Mix 1 gram of a mixed bed resin (such as Sigma Prod. No. M8032) with 10 mL of formamide.
2. Stir for approximately 1 hour.
3. Filter two times through Whatman #1 filter.
4. Sterile filter and store for a single use at -20 C; stable up to 6 months.
If the deionized formamide is stored at room temperature, deionize every 2 weeks. The pH of a 0.5 M solution is approximately 5.0 before deionization and approximately 6.8 after deionization. Formamide with a yellowish appearance requires deionization.
Note that this product has not been tested for suitability in molecular biology. Please see the links below to review Formamide product suitable for Molecular Biology:
https://www.sigmaaldrich.com/product/sigma/47671
https://www.sigmaaldrich.com/product/mm/344206m

