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Different sonication times (15, 30, 60 and 120min) were applied in aqueous media to olive tree pruning residues lignin obtained by alkaline fractionation (7.5% w/w NaOH, solid to liquid ratio 1:10w/w, 90min, 85°C). The observed sample solubilisation ratio due to ultrasonic irradiation was 24–28%. The resulted liquid fractions were analyzed by HPLC in order to determine their mono- and polysaccharides...
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