Normal-phase HPLC (NP-HPLC) of the labeled portion was performed using a TSK-Gel Amide-80 4.6 × 250 mm column (TosohBioSep, Japan) on a separation module (Merck–Hitachi, Japan)equipped with a fluorescence detector. Labeled N-glycans wereseparated by a linear gradient of 20–58% of 50 mM ammo-nium formiate pH 4.4 against acetonitrile over 152 min at a flowrate of 0.4 mL/min. Samples were injected in 80% acetonitrile.The fluorescence detection was carried out using an excitationwavelength of 330 nm and an emission wavelength of 420 nm[31]. The elution positions of the N-glycans were determinedin glucose units (GU) by comparison with a standard dextranhydrolysate 2AB labeled (dextran ladder) [12]. The glycosyla-tion was also analyzed by mass spectrometry (MALDI-MS) usingan Axima Performance mass spectrometer (Shimadzu Biotech,Japan).