Articles by Phu Duong - BioPharm International

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Articles by Phu Duong

Phu Duong


Articles
Analysis of Erythropoietin Glycopeptides and Glycoforms by HILIC and RP Chromatography
May 28, 2013

Reversed-phase UHPLC/HPLC is routinely used for peptide mapping, but if the digest contains hydrophilic peptides, such as glycopeptides, valuable information can be missed. This note demonstrates peptide mapping of digested glycoprotein erythropoietin (EPO) protein using an Agilent ZORBAX Rapid Resolution High Definition 300-HILIC 1.8 ?m LC column and a TOF MS. Taking advantage of the high organic solvent system of the mobile phase for HILIC (hydrophilic interaction chromatography), the glycopeptides are effectively dissolved, retained and separated by the HILIC column. This app note includes the separation, sequence coverage and comparison of reversed-phase and HILIC data to demonstrate the utility of HILIC as an orthogonal and complementary approach to RPLC/MS for peptide analysis.

Characterization of Glycosylation in the Fc Region of Therapeutic Recombinant Monoclonal Antibody
May 28, 2013

In this note, we describe a fast and efficient liquid chromatography-TOF mass spectrometry approach to characterize an IgG derived from CHO cells. An Agilent Poroshell 300SB-C3, 5 um superficially porous IgG1 column was used to obtain accurate glycoform masses of an intact IgG1, with a subsequent analysis of papain-digeste3d IgG1 to obtain site-specific glycosylation profile information of the Fc region for further characterization of IgG1 heterogeneity. Additionally, a subsequent mAb-glyco chip LC/MS analysis was used to build a glycan accurate mass database for additional validation of the glycans identified in the TOF mass analysis.

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