Sep 03, 2013 · • Pall 0.2 μm Acrodisc MS syringe filters (PN MS-3201) • Pall 0.45 μm Acrodisc PSF syringe filters with nylon membrane (PN AP-4502) • Polymer microsphere, 0.31 μm, 10% w/w suspension (Thermo Scientific, PN 5031A) • Triton X-100 (Sigma-Aldrich, PN 21568) • Acetonitrile, BAKER ANALYZED HPLC ultra gradient solvent (J.T. Baker, PN 9017)