EFFECT OF REACTION TIME AND SODIUM HYDROXIDE CONCENTRATION ON DELIGNIFICATION AND ENZYMATIC HYDROLYSISOF BREWER’S SPENT GRAIN FROM WO BRAZILIAN BREWERS
| Autor: | Carlos Alberto Galeano Suarez, Carla Lobo Gomes, Dasciana de Sousa Rodrigues, Elizabeth Gonçalves, Inti Doraci Cavalcanti Montano |
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| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
chemistry.chemical_classification 020209 energy Organic Chemistry 02 engineering and technology 01 natural sciences chemistry.chemical_compound Enzyme chemistry Sodium hydroxide 010608 biotechnology 0202 electrical engineering electronic engineering information engineering Materials Chemistry Nuclear chemistry |
| Zdroj: | Cellulose Chemistry and Technology. 55:101-112 |
| ISSN: | 2457-9459 0576-9787 |
| DOI: | 10.35812/cellulosechemtechnol.2021.55.10 |
| Popis: | Brazil, being one of the main beer producers, generates brewer’s spent grain as a main by-product of this industry, which is mainly composed of cellulose, hemicelluloses, lignin and extractives. The alkaline pretreatment of brewer’s spent grain received from two breweries is studied in this work, namely breweries Imperial (B1) and Colombina (B2). Factorial design (22) was realized with three experiments at the central point: contact time (30, 60, 90 min) and NaOH concentration (4%, 6%, 8%). It was found that the presence of extractives causes interference in the characterization of the material. The delignification process allowed obtaining materials with lower lignin percentages when higher NaOH concentrations were used, reaching percentages of lignin loss with values between 85-95%, in both materials, but for these conditions, the losses of cellulose were considerable – of 35-43%. Enzymatic hydrolysis of the pretreated materials achieved conversions greater than 70%, emphasizing that the greatest conversions were obtained with material B1, where almost the whole cellulose was hydrolyzed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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