Abstract: The present disclosure provides a method for determining the relative conformations of a protein provided in different protein preparations, comprising steps of: (i) obtaining a first 2D NOESY NMR spectrum of a first protein preparation; (ii) obtaining a second 2D NOESY NMR spectrum of a second protein preparation; and (iii); determining whether a protein has a different conformation in the first and second protein preparations by comparing one or more cross-peaks in the first 2D NOESY NMR spectrum with one or more corresponding cross-peaks in the second 2D NOESY NMR spectrum.

Abstract: The present disclosure provides nuclear magnetic resonance (NMR) methods for characterizing mixtures of N-linked glycans. Without limitation, methods of the present disclosure may be useful in characterizing monosaccharide composition, branching, fucosylation, sulfation, phosphorylation, sialylation linkages, presence of impurities and/or efficiency of a labeling procedure (e.g., labeling with a fluorophore such as 2-AB). In certain embodiments, the methods can be used quantitatively. In certain embodiments, the methods can be combined with enzymatic digestion to further characterize glycan mixtures.

Abstract: The present disclosure provides nuclear magnetic resonance (NMR) methods for characterizing mixtures of N-linked glycans. Without limitation, methods of the present disclosure may be useful in characterizing monosaccharide composition, branching, fucosylation, sulfation, phosphorylation, sialylation linkages, presence of impurities and/or efficiency of a labeling procedure (e.g., labeling with a fluorophore such as 2-AB). In certain embodiments, the methods can be used quantitatively. In certain embodiments, the methods can be combined with enzymatic digestion to further characterize glycan mixtures.

Abstract: The presently disclosed subject matter provides methods for evaluating and characterizing peptides, peptide mixtures, and polypeptide mixtures. More particularly, the presently disclosed subject matter provides methods for evaluating or characterizing complex peptide or polypeptide mixtures comprising glutamic acid, alanine, tyrosine, and lysine, e.g., Copolymer-1 or glatiramer acetate, including, but not limited to, methods of identifying, isolating, quantifying, and purifying amino acids, peptides, polypeptides, and combinations thereof having a diethylamide group instead of a carboxyl group present on the C-terminus. The presently disclosed methods can be used to determine the mole percent of polypeptides having a diethylamide group at a C-terminus thereof and can be used to evaluate one or more properties of a sample of one polypeptide mixture as compared to one or more properties of a different sample of a polypeptide mixture.

Abstract: The present disclosure provides nuclear magnetic resonance (NMR) methods for characterizing mixtures of N-linked glycans. Without limitation, methods of the present disclosure may be useful in characterizing monosaccharide composition, branching, fucosylation, sulfation, phosphorylation, sialylation linkages, presence of impurities and/or efficiency of a labeling procedure (e.g., labeling with a fluorophore such as 2-AB). In certain embodiments, the methods can be used quantitatively. In certain embodiments, the methods can be combined with enzymatic digestion to further characterize glycan mixtures.

Abstract: The present disclosure provides nuclear magnetic resonance (NMR) methods for characterizing mixtures of N-linked glycans. Without limitation, methods of the present disclosure may be useful in characterizing monosaccharide composition, branching, fucosylation, sulfation, phosphorylation, sialylation linkages, presence of impurities and/or efficiency of a labeling procedure (e.g., labeling with a fluorophore such as 2-AB). In certain embodiments, the methods can be used quantitatively. In certain embodiments, the methods can be combined with enzymatic digestion to further characterize glycan mixtures.

Abstract: Methods for analyzing mixtures of polysaccharides, for example heparin such as enoxaparin are described. In some instances, the mixtures are analyzed using 1D NMR and/or 2D NMR.

Abstract: The present disclosure provides nuclear magnetic resonance (NMR) methods for characterizing mixtures of N-linked glycans. Without limitation, methods of the present disclosure may be useful in characterizing monosaccharide composition, branching, fucosylation, sulfation, phosphorylation, sialylation linkages, presence of impurities and/or efficiency of a labeling procedure (e.g., labeling with a fluorophore such as 2-AB). In certain embodiments, the methods can be used quantitatively. In certain embodiments, the methods can be combined with enzymatic digestion to further characterize glycan mixtures.

Abstract: The present disclosure provides a method for determining the relative conformations of a protein provided in different protein preparations, comprising steps of: (i) obtaining a first 2D NOESY NMR spectrum of a first protein preparation; (ii) obtaining a second 2D NOESY NMR spectrum of a second protein preparation; and (iii); determining whether a protein has a different conformation in the first and second protein preparations by comparing one or more cross-peaks in the first 2D NOESY NMR spectrum with one or more corresponding cross-peaks in the second 2D NOESY NMR spectrum.

Abstract: The presently disclosed subject matter provides methods for evaluating and characterizing peptides, peptide mixtures, and polypeptide mixtures. More particularly, the presently disclosed subject matter provides methods for evaluating or characterizing complex peptide or polypeptide mixtures comprising glutamic acid, alanine, tyrosine, and lysine, e.g., Copolymer-1 or glatiramer acetate, including, but not limited to, methods of identifying, isolating, quantifying, and purifying amino acids, peptides, polypeptides, and combinations thereof having a diethylamide group instead of a carboxyl group present on the C-terminus. The presently disclosed methods can be used to determine the mole percent of polypeptides having a diethylamide group at a C-terminus thereof and can be used to evaluate one or more properties of a sample of one polypeptide mixture as compared to one or more properties of a different sample of a polypeptide mixture.