Mild alkaline/oxidative pretreatment of wheat straw |
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Authors: | Nicoletta Curreli MBenedetta Fadda Antonio Rescigno Andrea C Rinaldi Giulia Soddu Francesca Sollai Stefano Vaccargiu Enrico Sanjust Augusto Rinaldi |
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Institution: | Istituto di Chimica Biologica, Università di Cagliari, Via della Pineta 77, 09125, Cagliari, Italy |
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Abstract: | A new mild alkaline/oxidative pretreatment of wheat straw prior to enzymic hydrolysis was carried out. It consists of a first alkaline (1% NaOH for 24 h) step, which mainly solubilises hemicellullose and renders the material more accessible to further chemical attack, and a second alkaline/oxidative step (1% NaOH and 0·3% H2O2 for 24 h), which solubilises and oxidises lignin to minor polluting compounds. The entire process was carried out at low temperature (25–40°C) using a low concentration of chemicals, resulting in a relatively low cost and waste liquors containing only trace amounts of dangerous pollutants derived from lignin. Recovery of cellulose after the double pretreatment reached 90% of that contained in the starting material, with a concomitant 81% degradation of lignin. The action of a commercial cellulase on the cellulose obtained produced a syrup with a high concentration of reducing sugars (220 mg/ml), of which a large percentage was glucose. |
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Keywords: | lignocellulosics cellulase substrates wheat straw mild alkaline pretreatments hydrogen peroxide pretreatment |
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