Deionized formamide
8% gel resin (equivalent of Dowex XG8 mixed bed resin)
Deionize the formamide by stirring with an 8% gel resin in a glass beaker for 1 h on a magnetic stirrer. Remove the resin by filtering twice through Whatman No. 1 paper. Store deionized formamide in small aliquots under nitrogen (to prevent oxidation) at −70°C.










