Chemically modified cellulose nanocrystals as polyanion for preparation of polyelectrolyte complex.

Bacterial cellulose nanocrystals (BCNCs) have hydrophilic surfaces due to hydroxyl groups but are water-insoluble. The carboxymethylation improves the solubility of cellulose in polar media through the insertion of carboxymethyl groups. This study aims to evaluate the use of two different alcoholic solvents in the carboxymethylation reaction of BCNCs: ethanol and isopropanol. BCNCs were obtained under two hydrolysis conditions: sulfuric acid (BCNC-S) and combination of sulfuric and hydrochloric acids (BCNC-S/Cl). Two techniques (NMR and titration) were used to determine the degree of substitution (DS) values. Carboxymethylation of BCNC-S/Cl led to high DS compared to BCNC-S and the use of isopropanol promoted an even greater DS. The thermal properties were not affected after the chemical modification. However, functionalization provided an increase in the negative charge density at the surface of nanostructures and a change in the crystal structure (cellulose type Ia for amorphous), making this material a potential polyanion for the synthesis of polyelectrolyte complexes (PECs). The micrographs showed that the nanocrystals became soluble after carboxymethylation. Carboxymethylated bacterial cellulose nanocrystals hydrolyzed through the mixture of inorganic acids and modified using isopropanol (CBCNC-S/Cl-IPA) was a suitable polyanion to produce PECs with chitosan. The PECs produced had particle size ranging from 276 to 588 nm and zeta potential ranging from - 24.3 to + 39.0 mV.

Saved in:
Bibliographic Details
Main Authors: VASCONCELOS, N. F., FEITOSA, J. P. A., ANDRADE, F. K., MIRANDA, M. A. R., SASAKI, J. M., MORAIS, J. P. S., SILVA, L. M. A. e, CANUTO, K. M., ROSA, M. de F.
Other Authors: Niédja Fittipaldi Vasconcelos, Universidade Federal do Ceará - UFC/Departamento de Química; Judith Pessoa Andrade Feitosa, Universidade Federal do Ceará - UFC/Departamento de Química; Fábia Karine Andrade, Universidade Federal do Ceará - UFC/Departamento de Engenharia Química; Marcus Aurélio Ribeiro Miranda, Universidade Federal do Ceará - UFC/Departamento de Física; José Marcos Sasaki, Universidade Federal do Ceará - UFC/Departamento de Física; JOAO PAULO SARAIVA MORAIS, CNPA; LORENA MARA ALEXANDRE E SILVA, CNPAT; KIRLEY MARQUES CANUTO, CNPAT; MORSYLEIDE DE FREITAS ROSA, CNPAT.
Format: Artigo de periódico biblioteca
Language:English
eng
Published: 2020-01-14
Subjects:Carboxymethylation, Polyelectrolytic complexes, Hydrolysis, Nanocrystals, Chitosan,
Online Access:http://www.alice.cnptia.embrapa.br/alice/handle/doc/1118682
Tags: Add Tag
No Tags, Be the first to tag this record!
id dig-alice-doc-1118682
record_format koha
spelling dig-alice-doc-11186822020-01-14T18:12:31Z Chemically modified cellulose nanocrystals as polyanion for preparation of polyelectrolyte complex. VASCONCELOS, N. F. FEITOSA, J. P. A. ANDRADE, F. K. MIRANDA, M. A. R. SASAKI, J. M. MORAIS, J. P. S. SILVA, L. M. A. e CANUTO, K. M. ROSA, M. de F. Niédja Fittipaldi Vasconcelos, Universidade Federal do Ceará - UFC/Departamento de Química; Judith Pessoa Andrade Feitosa, Universidade Federal do Ceará - UFC/Departamento de Química; Fábia Karine Andrade, Universidade Federal do Ceará - UFC/Departamento de Engenharia Química; Marcus Aurélio Ribeiro Miranda, Universidade Federal do Ceará - UFC/Departamento de Física; José Marcos Sasaki, Universidade Federal do Ceará - UFC/Departamento de Física; JOAO PAULO SARAIVA MORAIS, CNPA; LORENA MARA ALEXANDRE E SILVA, CNPAT; KIRLEY MARQUES CANUTO, CNPAT; MORSYLEIDE DE FREITAS ROSA, CNPAT. Carboxymethylation Polyelectrolytic complexes Hydrolysis Nanocrystals Chitosan Bacterial cellulose nanocrystals (BCNCs) have hydrophilic surfaces due to hydroxyl groups but are water-insoluble. The carboxymethylation improves the solubility of cellulose in polar media through the insertion of carboxymethyl groups. This study aims to evaluate the use of two different alcoholic solvents in the carboxymethylation reaction of BCNCs: ethanol and isopropanol. BCNCs were obtained under two hydrolysis conditions: sulfuric acid (BCNC-S) and combination of sulfuric and hydrochloric acids (BCNC-S/Cl). Two techniques (NMR and titration) were used to determine the degree of substitution (DS) values. Carboxymethylation of BCNC-S/Cl led to high DS compared to BCNC-S and the use of isopropanol promoted an even greater DS. The thermal properties were not affected after the chemical modification. However, functionalization provided an increase in the negative charge density at the surface of nanostructures and a change in the crystal structure (cellulose type Ia for amorphous), making this material a potential polyanion for the synthesis of polyelectrolyte complexes (PECs). The micrographs showed that the nanocrystals became soluble after carboxymethylation. Carboxymethylated bacterial cellulose nanocrystals hydrolyzed through the mixture of inorganic acids and modified using isopropanol (CBCNC-S/Cl-IPA) was a suitable polyanion to produce PECs with chitosan. The PECs produced had particle size ranging from 276 to 588 nm and zeta potential ranging from - 24.3 to + 39.0 mV. 2020-01-14T18:12:24Z 2020-01-14T18:12:24Z 2020-01-14 2019 2020-01-20T11:11:11Z Artigo de periódico Cellulose, v. 26, n. 3, p. 1725-1746, February 2019. http://www.alice.cnptia.embrapa.br/alice/handle/doc/1118682 en eng openAccess
institution EMBRAPA
collection DSpace
country Brasil
countrycode BR
component Bibliográfico
access En linea
databasecode dig-alice
tag biblioteca
region America del Sur
libraryname Sistema de bibliotecas de EMBRAPA
language English
eng
topic Carboxymethylation
Polyelectrolytic complexes
Hydrolysis
Nanocrystals
Chitosan
Carboxymethylation
Polyelectrolytic complexes
Hydrolysis
Nanocrystals
Chitosan
spellingShingle Carboxymethylation
Polyelectrolytic complexes
Hydrolysis
Nanocrystals
Chitosan
Carboxymethylation
Polyelectrolytic complexes
Hydrolysis
Nanocrystals
Chitosan
VASCONCELOS, N. F.
FEITOSA, J. P. A.
ANDRADE, F. K.
MIRANDA, M. A. R.
SASAKI, J. M.
MORAIS, J. P. S.
SILVA, L. M. A. e
CANUTO, K. M.
ROSA, M. de F.
Chemically modified cellulose nanocrystals as polyanion for preparation of polyelectrolyte complex.
description Bacterial cellulose nanocrystals (BCNCs) have hydrophilic surfaces due to hydroxyl groups but are water-insoluble. The carboxymethylation improves the solubility of cellulose in polar media through the insertion of carboxymethyl groups. This study aims to evaluate the use of two different alcoholic solvents in the carboxymethylation reaction of BCNCs: ethanol and isopropanol. BCNCs were obtained under two hydrolysis conditions: sulfuric acid (BCNC-S) and combination of sulfuric and hydrochloric acids (BCNC-S/Cl). Two techniques (NMR and titration) were used to determine the degree of substitution (DS) values. Carboxymethylation of BCNC-S/Cl led to high DS compared to BCNC-S and the use of isopropanol promoted an even greater DS. The thermal properties were not affected after the chemical modification. However, functionalization provided an increase in the negative charge density at the surface of nanostructures and a change in the crystal structure (cellulose type Ia for amorphous), making this material a potential polyanion for the synthesis of polyelectrolyte complexes (PECs). The micrographs showed that the nanocrystals became soluble after carboxymethylation. Carboxymethylated bacterial cellulose nanocrystals hydrolyzed through the mixture of inorganic acids and modified using isopropanol (CBCNC-S/Cl-IPA) was a suitable polyanion to produce PECs with chitosan. The PECs produced had particle size ranging from 276 to 588 nm and zeta potential ranging from - 24.3 to + 39.0 mV.
author2 Niédja Fittipaldi Vasconcelos, Universidade Federal do Ceará - UFC/Departamento de Química; Judith Pessoa Andrade Feitosa, Universidade Federal do Ceará - UFC/Departamento de Química; Fábia Karine Andrade, Universidade Federal do Ceará - UFC/Departamento de Engenharia Química; Marcus Aurélio Ribeiro Miranda, Universidade Federal do Ceará - UFC/Departamento de Física; José Marcos Sasaki, Universidade Federal do Ceará - UFC/Departamento de Física; JOAO PAULO SARAIVA MORAIS, CNPA; LORENA MARA ALEXANDRE E SILVA, CNPAT; KIRLEY MARQUES CANUTO, CNPAT; MORSYLEIDE DE FREITAS ROSA, CNPAT.
author_facet Niédja Fittipaldi Vasconcelos, Universidade Federal do Ceará - UFC/Departamento de Química; Judith Pessoa Andrade Feitosa, Universidade Federal do Ceará - UFC/Departamento de Química; Fábia Karine Andrade, Universidade Federal do Ceará - UFC/Departamento de Engenharia Química; Marcus Aurélio Ribeiro Miranda, Universidade Federal do Ceará - UFC/Departamento de Física; José Marcos Sasaki, Universidade Federal do Ceará - UFC/Departamento de Física; JOAO PAULO SARAIVA MORAIS, CNPA; LORENA MARA ALEXANDRE E SILVA, CNPAT; KIRLEY MARQUES CANUTO, CNPAT; MORSYLEIDE DE FREITAS ROSA, CNPAT.
VASCONCELOS, N. F.
FEITOSA, J. P. A.
ANDRADE, F. K.
MIRANDA, M. A. R.
SASAKI, J. M.
MORAIS, J. P. S.
SILVA, L. M. A. e
CANUTO, K. M.
ROSA, M. de F.
format Artigo de periódico
topic_facet Carboxymethylation
Polyelectrolytic complexes
Hydrolysis
Nanocrystals
Chitosan
author VASCONCELOS, N. F.
FEITOSA, J. P. A.
ANDRADE, F. K.
MIRANDA, M. A. R.
SASAKI, J. M.
MORAIS, J. P. S.
SILVA, L. M. A. e
CANUTO, K. M.
ROSA, M. de F.
author_sort VASCONCELOS, N. F.
title Chemically modified cellulose nanocrystals as polyanion for preparation of polyelectrolyte complex.
title_short Chemically modified cellulose nanocrystals as polyanion for preparation of polyelectrolyte complex.
title_full Chemically modified cellulose nanocrystals as polyanion for preparation of polyelectrolyte complex.
title_fullStr Chemically modified cellulose nanocrystals as polyanion for preparation of polyelectrolyte complex.
title_full_unstemmed Chemically modified cellulose nanocrystals as polyanion for preparation of polyelectrolyte complex.
title_sort chemically modified cellulose nanocrystals as polyanion for preparation of polyelectrolyte complex.
publishDate 2020-01-14
url http://www.alice.cnptia.embrapa.br/alice/handle/doc/1118682
work_keys_str_mv AT vasconcelosnf chemicallymodifiedcellulosenanocrystalsaspolyanionforpreparationofpolyelectrolytecomplex
AT feitosajpa chemicallymodifiedcellulosenanocrystalsaspolyanionforpreparationofpolyelectrolytecomplex
AT andradefk chemicallymodifiedcellulosenanocrystalsaspolyanionforpreparationofpolyelectrolytecomplex
AT mirandamar chemicallymodifiedcellulosenanocrystalsaspolyanionforpreparationofpolyelectrolytecomplex
AT sasakijm chemicallymodifiedcellulosenanocrystalsaspolyanionforpreparationofpolyelectrolytecomplex
AT moraisjps chemicallymodifiedcellulosenanocrystalsaspolyanionforpreparationofpolyelectrolytecomplex
AT silvalmae chemicallymodifiedcellulosenanocrystalsaspolyanionforpreparationofpolyelectrolytecomplex
AT canutokm chemicallymodifiedcellulosenanocrystalsaspolyanionforpreparationofpolyelectrolytecomplex
AT rosamdef chemicallymodifiedcellulosenanocrystalsaspolyanionforpreparationofpolyelectrolytecomplex
_version_ 1756026717317627904