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Merck
  • Facile, room-temperature pre-treatment of rice husks with tetrabutylphosphonium hydroxide: Enhanced enzymatic and acid hydrolysis yields.

Facile, room-temperature pre-treatment of rice husks with tetrabutylphosphonium hydroxide: Enhanced enzymatic and acid hydrolysis yields.

Bioresource technology (2015-09-08)
B B Y Lau, E T Luis, M M Hossain, W E S Hart, B Cencia-Lay, J J Black, T Q To, L Aldous
RESUMO

Aqueous solutions of tetrabutylphosphonium hydroxide have been evaluated as pretreatment media for rice husks, prior to sulphuric acid hydrolysis or cellulase enzymatic hydrolysis. Varying the water:tetrabutylphosphonium hydroxide ratio varied the rate of delignification, as well as silica, lignin and cellulose solubility. Pre-treatment with 60wt% hydroxide dissolved the rice husk and the regenerated material was thus heavily disrupted. Sulphuric acid hydrolysis of 60wt%-treated samples yielded the highest amount of glucose per gram of rice husk. Solutions with good lignin and silica solubility but only moderate to negligible cellulose solubility (10-40wt% hydroxide) were equally effective as pre-treatment media for both acid and enzymatic hydrolysis. However, pre-treatment with 60wt% hydroxide solutions was incompatible with downstream enzymatic hydrolysis. This was due to significant incorporation of phosphonium species in the regenerated biomass, which significantly inhibited the activity of the cellulase enzymes.

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Sigma-Aldrich
Hidróxido de tetrabutilamônio, 40 wt. % in H2O
Sigma-Aldrich
Hidróxido de tetrabutilamônio, 1.0 M in methanol
Sigma-Aldrich
Hidróxido de tetrabutilamônio, technical, ~40% in H2O (~1.5 M)
Sigma-Aldrich
Hidróxido de tetrabutilamônio, 53.5-56.5% in H2O