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2 protocols using disodium phosphate na2hpo4

1

Glycoprotein Characterization by Mass Spectrometry

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HPLC grade water was acquired from Macron Fine Chemicals™ Avantor Performance Materials (Center Valley, PA). Formic acid (FA) and HPLC grade acetonitrile (ACN) were purchased from Fisher Scientific (Pittsburgh, PA). Sodium chloride (NaCl) and disodium phosphate (Na2HPO4) were acquired from Mallinckrodt Chemicals (St. Louis, MO). Ammonium bicarbonate (ABC), DL-dithiothreitol (DTT) and iodoacetamide (IAA) were obtained from Sigma-Aldrich (St. Louis, MO). Fetuin, α1-acid glycoprotein (AGP), porcine thyroglobulin (PTG) and pooled human blood serum (BS) were also obtained from Sigma-Aldrich (St. Louis, MO). Mass spectrometry grade trypsin was acquired from Promega (Madison, WI). Endoproteinase GluC and PNGase F with 10×G7 reaction buffer (0.5 M sodium phosphate) were purchased from New England Biolabs (Ipswich, MA).
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2

HPLC-based Glycopeptide Enrichment

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HPLC-grade solvents, including methanol,
isopropanol, and water, were procured from Macron Fine Chemicals-Avantor
Performance Materials (Center Valley, PA). HPLC-grade acetonitrile
(ACN) was purchased from Fisher Scientific (Pittsburgh, PA). Sodium
chloride (NaCl) and disodium phosphate (Na2HPO4) were obtained from Mallinckrodt Chemicals (Phillipsburg, NJ). MS-grade
formic acid (FA), trifluoroacetic acid (TFA), and acetic acid were
obtained from Sigma-Aldrich (St. Louis, MO). d,l-Dithiothreitol (DTT), iodoacetamide (IAA), 3-[(3-cholamidopropyl)dimethylammonio]-1-propanesulfonate
(CHAPS), sodium dodecyl sulfate (SDS), urea, sodium meta-periodate,
and sodium acetate (NaAc) were also purchased from Sigma-Aldrich.
Sephadex G-25 spin column was obtained from GE Healthcare Life Science
(Pittsburgh, PA). Agarose-bound Sambucus nigra agglutinin
and Aleuria aurantia lectin were purchased from Vector
Laboratories (Burlingame, CA). 1 μm diameter BcMag hydrazide-modified
magnetic beads were acquired from Bioclone (San Diego, CA). Mass-spectrometry-grade
trypsin was obtained from Promega (Madison, WI), while PNGase F was
purchased from New England Biolabs (Ipswich, MA).
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