Wash buffer

Reagent	Final concentration	Amount
Tris-HCl pH 7.5 (1 M)	20 mM	2 mL
NaCl (5 M)	50 mM	1 mL
2-mercaptoethanol (BME) (14.3 M)	5 mM	0.35 mL
ddH2O	n/a	96.65 mL
Total	n/a	100 mL

Filter and sterilize with a 0.22 μm filter. Store at room temperature for about a week.