1X NEBuffer SspI: 50 mM NaCl 100 mM Tris-HCl 10 mM MgCl2 0.025 % Triton X-100 pH 7.5 @ 25°C
A 50 µl reaction containing this reaction buffer at a 1X concentration and 1 µg of HaeIII digested ΦX174 RF I DNA incubated for 16 hours resulted in no detectable non-specific nuclease degradation.
Endonuclease Activity: Incubation of this reaction buffer at a 1X concentration with 1 µg ΦX174 RF I DNA for 4 hours at 37°C in 50 µl reactions resulted in less than 5% conversion to RF II.