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The UV-Vis photoacoustic (PA) spectroscopy was demonstrated suitable for sensitive, direct and non-destructive study of lignin in synthetic cellulose/xylan mixtures. The PA spectra recorded in the 250-550nm wavelength range show no characteristic peak; however the amplitude of the PA signal tends to increase for higher contents of lignin in the mixture. The quantification of lignin in cellulose/xylan...