Buffer G2 is a component of QIAGEN Blood & Cell Culture DNA Kits, but is also provided with several other kits (e.g., for automation on the EZ1 Advanced instrument). Usually Buffer G2 is used in combination with Proteinase K or QIAGEN Protease for efficient lysis.
Buffer G2 (General Lysis Buffer ) consists of: 800 mM guanidine hydrochloride; 30 mM Tris•Cl, pH 8.0; 30 mM EDTA, pH 8.0; 5% Tween 20; 0.5% Triton X-100.
How to prepare Buffer G2: Dissolve 76.42 g guanidine hydrochloride, 11.17g Na2EDTA•2H2O, and 3.63 g Tris base in 600 ml distilled water. Add 250 ml 20% Tween 20 solution and 50 ml 10% Triton X-100 solution. Adjust the pH to 8.0 with NaOH. Adjust the volume to 1 liter with distilled water.