Fractionation of green coconut fiber using sequential hydrothermal/alkaline pretreatments and amberlite XAD-7HP resin

• Autor(a) principal: Souza, Domingos Fabiano de Santana
• Data de Publicação: 2019
• Outros Autores: Padilha, Carlos Eduardo de Araújo, Nogueira, Cleitiane da Costa, Oliveira Filho, Marcos Antônio, Sousa Júnior, Francisco Canindé de, Assis, Cristiane Fernandes de, Oliveira, Jackson Araújo de, Santos, Everaldo Silvino dos
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRN
• Texto Completo: https://repositorio.ufrn.br/handle/123456789/45164
• topic: Alkaline pretreatment; Ethanol production; Phenolic compounds; Lignin recovery; Arabinoxylan recovery; Methylene blue dye

The fractionation of agroindustrial and forest residues is a premise of the biorefinery concept. Thus, the present study focuses on pretreatments (hydrothermal and alkaline) and detoxification processes in order to transform green coconut fiber (GCF) into cellulose-rich material, dye biosorbent, bioactive phenolic compounds, lignin and arabinoxylan. The adsorption onto Amberlite XAD-7HP resin allowed the best recovery of phenolic compounds from hydrothermal pretreatment liquor, which presented potent antioxidant activities such as inhibition of hydroxyl and superoxide radicals of 77.05% and 76.88%, respectively. Acid precipitation was effective to recover 41.23% of the initial lignin content from alkaline pretreatment liquor. The detoxified hydrothermal pretreatment liquor was used as an additional source of glucose, increasing the final concentration of ethanol by 79.6% in simultaneous saccharification and fermentation of delignified GCF. Using delignified GCF as biosorbent, made it possible to obtain a static adsorption capacity of 200 mg of methylene blue dye per gram of biosorbent and good recyclability in dynamic experiments. Therefore, the proposed methodology guarantees a practical way of manufacturing value-added products from lignocellulosic materials