UltraPure™ Urea UltraPure™ Urea is an effective protein denaturant. In a highly concentrated (6 to 8 M) urea solution, many proteins unfold and separate into their constituent polypeptide chains. UltraPure™ Urea is also used to denature nucleic acids in sequencing gels. Form: Powder Product Size: 500 g Reagent Type: Urea Shipping Condition: Room Temperature Regulatory Statement: For Research Use Only. Not for use in diagnostic procedures. Store at room temperature.