Gorse (Ulex europæus) as a possible source of xylans by hydrothermal treatment
▶ Gorse (Ulex europæus) has been used to test its potential use as a source of xylan. An hydrothermal process was applied to extract xylan. Different reaction temperatures and times were tested to determine the best process conditions. Extraction of xylan showed a strong dependence on temperature an...
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Veröffentlicht in: | Industrial crops and products 2011-01, Vol.33 (1), p.205-210 |
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Sprache: | eng |
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Zusammenfassung: | ▶ Gorse (Ulex europæus) has been used to test its potential use as a source of xylan. An hydrothermal process was applied to extract xylan. Different reaction temperatures and times were tested to determine the best process conditions. Extraction of xylan showed a strong dependence on temperature and time. Increasing temperature yielded an increased amount of recovered xylan, reaching a maximum value of 62% (wt% on initial xylan) at 180°C for 30min, which is in agreement with other studies using non-wood material. The analysis of the kinetic behaviour as a function of the logarithm of the severity factor, RO, allowed the identification of a set of time/temperature combinations that were the most favourable to produce the maximum amount of xylan in solution, corresponding to the value of logRO=3.6.
Autocatalytic hydrothermal process conditions were used to study Ulex europæus (Gorse) as a source of xylan compounds. The aim was to study the possibilities for using this unutilised biomass material to produce xylans. Ulex is an evergreen shrub that grows in the northwest of Spain and has no economic value. Therefore, Ulex is considered a promising candidate as a biomass source. Ulex showed a total xylose content of 12%, thus qualifying it as a suitable material to extract xylan-derived compounds. Autohydrolysis was applied to extract xylans from Ulex. To find the best conditions for xylan extraction, samples of Ulex were subjected to different temperatures and time conditions. Results indicate that autohydrolysis is a suitable method to selectively extract xylans at temperatures between 160 and 190°C for 5–30min, reaching a maximum xylan recovery of almost 63% of the initial xylan at 180°C for 30min, with only small effects on cellulose and lignin contents. |
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ISSN: | 0926-6690 1872-633X |
DOI: | 10.1016/j.indcrop.2010.10.011 |