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Two-step acid and alkaline ethanolysis/alkaline peroxide fractionation of sugarcane bagasse and rice straw for production of polylactic acid precursor
Institution:1. Chemical Engineering Department, Faculty of Engineering, Mahidol University, 25/25 Putthamonthon 4 Road, Salaya, Putthamonthon, Nakorn Pathom 73170, Thailand;2. Biomedical Engineering Department, Faculty of Engineering, Mahidol University, 25/25 Putthamonthon 4 Road, Salaya, Putthamonthon, Nakorn Pathom 73170, Thailand;1. Department of Mathematics, Gyeongsang National University, Jinju, 660-701, Republic of Korea;2. Research Institute of Natural Science, Gyeongsang National University, Jinju, 660-701, Republic of Korea;1. Consiglio per la ricerca in agricoltura e l’analisi dell’economia agraria, Unità di ricerca per la suinicoltura (CRA-SUI), Via Beccastecca 345, 41018 San Cesario sul Panaro, Modena, Italy,;2. Consiglio per la ricerca in agricoltura e l’analisi dell’economia agraria, Centro di ricerca per le colture industriali (CRA-CIN), Via di Corticella, 133, 40128, Bologna, Italy;3. Consiglio per la ricerca in agricoltura e l''analisi dell''economia agraria, Centro di ricerca per l''agrobiologia e la pedologia (CRA-ABP), via di Lanciola 12/A, 50125 Cascine del Riccio, Firenze, Italy;1. CEB-Centre of Biological Engineering, Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal;2. QOPNA, Departamento de Química, Universidade de Aveiro, 3810-193 Aveiro, Portugal;3. Department of Chemical Engineering, Massachusetts Institute of Technology (MIT), 77 Massachusetts Ave, Cambridge, MA 02139, United States;1. Istituto di Scienze e Tecnologie per l′Energia e la Mobilità Sostenibili – Consiglio Nazionale delle Ricerche, P.le V. Tecchio 80, 80125 Napoli, Italy;2. Department of Biotechnology and Biomedicine, Technical University of Denmark, Søltofts Plads, Kgs. Lyngby, Lyngby 2800, Denmark;3. Dipartimento di Scienze Chimiche, Università degli Studi di Napoli Federico II, Complesso Universitario di Monte Sant''Angelo, 80126 Napoli, Italy;4. Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli Federico II, P.le V. Tecchio 80, 80125 Napoli, Italy;1. Biotechnology Laboratory, School of Chemical Engineering, National Technical University of Athens, 9 Iroon Polytechniou Str., Zografou Campus, Athens 5780, Greece;2. Division of Agriculture, School of Agriculture, Forestry and Food Science, Bern University of Applied Sciences, Längasse 85, 3052 Zollikofen, Switzerland;3. Biochemical Process Engineering, Division of Chemical Engineering, Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, Luleå SE-971 87, Sweden
Abstract:Sugarcane bagasse and rice straw were subjected to acid and alkaline ethanolysis and sequential enzymatic hydrolysis to produce glucose for lactic acid production. Influence of physico-chemical treatments using ultrasonic bath and ultrasonic probe was studied compared with mechanical stirring. The results showed that the highest glucose yield with least contamination of xylose was obtained from acid ethanolysis fractionation (5 N H2SO4 + 50%, v/v ethanol) when stirred at 90 °C for 4 h. Alkaline ethanolysis accomplished high amount of both glucose and xylose released, however it was not favorable substrate for homofermentative lactic acid bacteria. In order to enhance enzymatic hydrolysis of acid ethanolysis fractionated samples, lignin was subsequently removed by the second step alkaline/peroxide delignification. The maximum lactic acid was obtained at 23.6 ± 0.2 g/L from Lactobacillus casei fermentation after 72 h when hydrolysate from two-step acid hydrolysis and alkaline/peroxide fractionated sugarcane bagasse containing 24.6 g/L initial glucose concentration was used as substrate.
Keywords:Lignocellulose organosolv fractionation  Ultrasonication  Lignocellulose valorization  Lactic acid production  Polylactic acid precursor
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