Abstract
A fermented solid containing lipases was produced by solid-state fermentation of Rhizopus microsporus on sugarcane bagasse enriched with urea, soybean oil, and a mineral solution. The dry fermented solid produced using R. microsporus (RMFS) was used to catalyze the synthesis of alkyl-esters by esterification in a solvent-free system containing ethanol and oleic acid (as a model system) or a mixture of fatty acids obtained from the physical hydrolysis of soybean soapstock acid oil (FA-SSAO) in subcritical water. The conversions were 93.5 and 84.1%, for oleic acid and FA-SSAO, respectively, at 48 h and 40 °C, at a molar ratio (MR) of ethanol to fatty acid of 5:1. A further increase in the MR to 10:1 improved the production of ethylic-esters, giving conversions at 48 h of 98 and 86% for oleic acid and FA-SSAO, respectively. The results obtained in this work foster further studies on scaling-up of an environmentally friendly process to produce biofuels.
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Acknowledgements
Research scholarships were granted to Nadia Krieger and David Mitchell by CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico, Brasil) and to Vanderleia Botton by CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Brasil).
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Botton, V., Piovan, L., Meier, H.F. et al. Optimization of biodiesel synthesis by esterification using a fermented solid produced by Rhizopus microsporus on sugarcane bagasse. Bioprocess Biosyst Eng 41, 573–583 (2018). https://doi.org/10.1007/s00449-018-1892-5
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DOI: https://doi.org/10.1007/s00449-018-1892-5