HMO (4 or 9) and UDP-GlcNAc (1.5 eq per GlcNAc added) were dissolved at a final HMO concentration of 10 mM in a Mes buffer (50 mM, pH 7.0) containing Na2EDTA (10 mM). To this mixture, CIAP (10 U μL−1) and GCNT2 (7.5 μg per μmol HMO) were added. Following purification, the respective products (5, 78%, and 23, 74%) were obtained as white solids.
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