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• W1972694966 abstract "Steam explosion of Eucalyptus grandis has been carried out under various pretreatment conditions (200–210 °C, 2–5 min) after impregnation of the wood chips with 0.087 and 0.175% (w/w) H2SO4. This study, arranged as a 23 factorial design, indicated that pretreatment temperature is the most critical variable affecting the yield of steam-treated fractions. Pretreatment of 0.175% (w/w) H2SO4-impregnated chips at 210 °C for 2 min was the best condition for hemicellulose recovery (mostly as xylose) in the water soluble fraction, reaching almost 70% of the corresponding xylose theoretical yield. By contrast, lower pretreatment temperatures of 200 °C were enough to yield steam-treated substrates from which a 90% cellulose conversion was obtained in 48 h, using low enzyme loadings of a Celluclast 1.5 l plus Novozym 188 mixture (Novo Nordisk). Release of water-soluble chromophores was monitored by UV spectroscopy and their concentration increased with pretreatment severity. The yield of alkali-soluble lignin increased at higher levels of acid impregnation and pretreatment temperatures. Thermoanalysis of these lignin fractions indicated a pattern of lignin fragmentation towards greater pretreatment severities but lignin condensation prevailed at the most drastic pretreatment conditions." @default.
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• W1972694966 date "2003-01-01" @default.
• W1972694966 modified "2023-10-02" @default.
• W1972694966 title "Fractionation of Eucalyptus grandis chips by dilute acid-catalysed steam explosion" @default.
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• W1972694966 doi "https://doi.org/10.1016/s0960-8524(02)00165-7" @default.
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