16. Sodium dodecyl sulfate (SDS) is a commonly used detergent for protein extraction in proteomic researches. After trypsin digestion, which of the following materials/conditions may effectively remove SDS from the peptide mixture and make the sample more compatible with mass spectrometric analysis? (A) reverse phase resins, pH 3.0 (B) anion exchange resins, pH 8.0 (C) cation exchange resins, pH 3.0 (D) anion exchange resins, pH 3.0