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Attenuated total reflectance Fourier transform mid-infrared (FTIR-ATR) spectra of untreated alcohol insoluble residue (AIR) and pretreated with 0.1 M NaOH for 24 h at 21°C (AIK), for leaf and stem biomass from Arundo donax, Cortaderia selloana, Phragmites australis and Miscanthus × giganteus. The difference between AIR and AIK biomasses are presented by a red dashed line. Spectral bands of interest are marked as: a (1736 – 1730 cm–1) and f (1240 – 1235 cm–1).
