or
Protein Buffer Exchange; Zeba Micro Spin Desalting Columns, 7K MWCO, 75uL; Thermo Scientific Pierce; 25 columns; Fit microcentrifuge tubes; For desalting 25 samples, each 2 to 12uL
Protein Buffer Exchange; Zeba Spin Desalting Columns, 7K MWCO, 0.5mL; Thermo Scientific Pierce; 25 columns; Fit microcentrifuge tubes; For desalting 25 samples, each 30 to 130uL