| Reagent | Amount | 
|---|---|
| PEG-8000 (sigma) | 200 g | 
| NaCl | 35 g | 
| Milli Q water | 200 mL | 
| 10x PBS (pH 7.4) HyClone | 50 mL | 
| Dissolve by placing on a magnetic stirrer, with low heat if needed | |
| Makeup with MilliQ water | 500 mL | 
| Vacuum filter using 500 mL 0.2 μ filter (Thermo) and store in 4°C | |