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The accuracy of commercial α-d-glucopyranosyl uronic acid (GlcA) as a calibration standard for the determination of the 4-O-methyl-α-d-glucopyranosyl uronic acid (meGlcA) content in plant materials was studied. A batch of meGlcA standard was purified from commercial birch xylan and quantified using nuclear magnetic resonance spectroscopy. Both commercial GlcA and the purified meGlcA were used as standards...