Microwave-assisted carboxymethylation of cellulose extracted from brewer's spent grain.

Autor: dos Santos DM; Unidade de Ciências Exatas e Tecnológicas, Universidade Estadual de Goiás, Br 153, Fazenda Barreiro do Meio, 3105, 75132-903 Anápolis, Goiás, Brazil. Electronic address: danilomartins_1@hotmail.com., Bukzem Ade L; Unidade de Ciências Exatas e Tecnológicas, Universidade Estadual de Goiás, Br 153, Fazenda Barreiro do Meio, 3105, 75132-903 Anápolis, Goiás, Brazil. Electronic address: andrea_bukzem@hotmail.com., Ascheri DP; Unidade de Ciências Exatas e Tecnológicas, Universidade Estadual de Goiás, Br 153, Fazenda Barreiro do Meio, 3105, 75132-903 Anápolis, Goiás, Brazil. Electronic address: ascheridpr@gmail.com., Signini R; Unidade de Ciências Exatas e Tecnológicas, Universidade Estadual de Goiás, Br 153, Fazenda Barreiro do Meio, 3105, 75132-903 Anápolis, Goiás, Brazil. Electronic address: roberta.signini@ueg.br., de Aquino GL; Unidade de Ciências Exatas e Tecnológicas, Universidade Estadual de Goiás, Br 153, Fazenda Barreiro do Meio, 3105, 75132-903 Anápolis, Goiás, Brazil. Electronic address: gilbaqui@hotmail.com.
Jazyk: angličtina
Zdroj: Carbohydrate polymers [Carbohydr Polym] 2015 Oct 20; Vol. 131, pp. 125-33. Date of Electronic Publication: 2015 Jun 03.
DOI: 10.1016/j.carbpol.2015.05.051
Abstrakt: Cellulose was extracted from brewer's spent grain (BSG) by alkaline and bleaching treatments. The extracted cellulose was used in the preparation of carboxymethyl cellulose (CMC) by reaction with monochloroacetic acid in alkaline medium with the use of a microwave reactor. A full-factorial 2(3) central composite design was applied in order to evaluate how parameters of carboxymethylation process such as reaction time, amount of monochloroacetic acid and reaction temperature affect the average degree of substitution (DS) of the cellulose derivative. An optimization strategy based on response surface methodology has been used for this process. The optimized conditions to yield CMC with the highest DS of 1.46 follow: 5g of monochloroacetic acid per gram of cellulose, reaction time of 7.5min and temperature of 70°C. This work demonstrated the feasibility of a fast and efficient microwave-assisted method to synthesize carboxymethyl cellulose from cellulose isolated of brewer's spent grain.
(Copyright © 2015 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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