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CPMAS NMR spectra for untreated SHI-R (a) and treated shives SHI-W, SHI-OH, SHI-C and SHI-H (b–e). The NMR spectra show the C1–C6 peaks of the glucopyranose unit in the range 50–110 ppm and other peaks (marked with an *) due to residual lignin and/or impurities.
