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Quantitative 13C MultiCP solid-state NMR as a tool for evaluation of cellulose crystallinity index measured directly inside sugarcane biomass

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Figure  2a shows the MultiCP spectrum of untreated bagasse. The peak pattern is the same as that presented in Ref
Fig. 3 Effects of pretreatments in the NMR spectra. MultiCP spectra Hwith chemical shift assignments obtained in sugarcane bagasse under three pretreatment conditions (untreated, 1% H2SO4 and 1% 2SO4 + 4% NaOH)
Fig. 6 Effect of pretreatments in NMR crystallinity indexes. a MultiCP spectra amplified in the 80–94 ppm region, with the respective Gaussians/Lorentzians deconvolutions [14] for untreated bagasse and bagasse pretreated with 1% H2SO4 and with 1% H2SO4 + 4% NaOH; b CI values of sugarcane bagasse after each pretreatment step obtained according to the three procedures indicated.
Fig. 7 Effect of pretreatments in X-ray crystallinity indexes. peak height XRD method; a X-ray diffractograms of untreated bagasse and bagasse pretreated with 1% H2SO4 and with 1% H2SO4 + 4% NaOH, analyzed by the deconvolution XRD method; b CI values obtained by the deconvolution method after each pretreat-ment step; c XRD diffractograms of untreated bagasse and bagasse pretreated with 1% H2SO4 and with 1% H2SO4 + 4% NaOH, analyzed by the d CI values obtained by the peak height method after each pretreatment step.
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