Analytical Sciences

Abstract − Analytical Sciences, 26(1), 75 (2010).

Specific Extraction of Sialic-acid-containing Glycans and Glycopeptides Using Serotonin-bonded Silica
Masahiro YODOSHI, Tomoko IKUTA, Yukie MOURI, and Shigeo SUZUKI
Department of Pharmaceutical Sciences, Kinki University, 3-4-1 Kowakae, Higashi-osaka, Osaka 577-8502, Japan
Serotonin-bonded silica was developed for specific extraction of sialic-acid-containing glycans and glycopeptides. Serotonin, coupled by reductive amination with aldehyde silica particles via its ethylamino group, has strong affinity to sialic acid in glycan chain termini. Sialylated glycans trapped on serotonin silica particles are released by washing with ammonium acetate solution, providing highly efficient specific trap and release glycoconjugates. With >100 μmol/g adsorption capacity, the particles are applicable to purify labeled glycans after derivatization with 2-aminopyridine to remove excess reagents. Serotonin silica efficiently enriches sialic-acid-containing glycopeptides from tryptic digests for LC/MS analysis of glycans’ heterogeneity in glycoproteins.