Acid prehydrolysis of pinus pinaster bark with dilute sulfuric acid |
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Authors: | G Vázquez G Antorrena J C Parajó X L Francisco |
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Institution: | (1) Departamento de Enxeñería/Química Facultade de Química, Universidade de Santiago, Sp-15706 Santiago de Compostela, Spain |
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Abstract: | Summary The influence of temperature (100–150°C) and acid concentration (0–5 wt%) on the prehydrolysis of pine bark and its alkaline-extracted residues was studied (the latter were obtained by vigorously stirring the bark for 15 min with a solid/liquid ratio of 1:10). Optimal prehydrolysis conditions were established by the sectioning method with a solid/liquid ratio of 1:10. For milled bark these conditions were: temperature 125°C, sulphuric acid concentration 2 wt%, duration of prehydrolysis 4.5 h; and for alkali-extracted residues, temperature 125°C, sulphuric acid concentration 3 wt%, duration of prehydrolysis 5 h. These treatments removed respectively 90% and 75% of non-glucose sugars in the hydrolysate while solubilizing less than 20% (respectively 10%) of the potential glucose yield. Enzymatic digestion of bark successively alkali-extracted and prehydrolysed under optimal conditions gave poor results, with yields similar to those obtained after other pretreatments.This work was supported by the CAICYT (Pr. 0030/85) |
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