Insight into morphological, physicochemical and spectroscopic properties of beta-chitin nanocrystalline structures

Autor(es)

Facchinatto, William Marcondes ^[1] ; dos Santos, Danilo Martins ^[2] ; Bukzem, Andrea de Lacerda ^[1] ; Moraes, Tiago Bueno ^[3] ; Habitzreuter, Filipe ^[1] ; de Azevedo, Eduardo Ribeiro ^[4] ; Colnago, Luiz Alberto ^[2] ; Campana-Filho, Sergio Paulo ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sao Carlos Inst Chem, Ave Trabalhador Sao Carlense 400, POB 780, BR-13560590 Sao Carlos, SP - Brazil

^[2] Brazilian Corp Agr Res, Embrapa Instrumentat, Rua XV Novembro 1452, POB 741, BR-13560970 Sao Carlos, SP - Brazil

^[3] Univ Fed Minas Gerais, Dept Chem, Inst Exact Sci, Av Antonio Carlos 6627, POB 702, BR-31270901 Belo Horizonte, MG - Brazil

^[4] Univ Sao Paulo, Sao Carlos Inst Phys, Ave Trabalhador Sao Carlense 400, POB 369, BR-13560590 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Carbohydrate Polymers; v. 273, DEC 1 2021.
• Citações Web of Science: 0

Resumo

We systematically investigated the effect of beta-chitin (BCH) particle size on the preparation of nanocrystals/ nanowhiskers (CWH) by acid hydrolysis. Regardless this variable, CWH aqueous suspension exhibited outstanding stability and the average degree of acetylation remained nearly constant after the acid treatment. In contrast, the morphology, dimensions, crystallinity, and molecular weight of CHW were significantly affect by the particle size. Although needle-like crystals have predominated, BCH particles sizes significantly affected the dimensions and asymmetry of CWH, as confirmed by the rheological and NMR relaxation (T-2) behaviors. According to different SSNMR approaches, the acid hydrolysis meaningless affected the local chain conformation, while the spatial freedom of BCH intersheets, rated upon the mobility of methyl segments, was taken as evidence of higher permeability of acid into small particle sizes. Thus, this study demonstrated the importance of standardizing the surface/bulk proportions of beta-chitin aiming to predict and control the CWH morphology and related properties. (AU)

• Processo FAPESP: 19/13656-8 - Desenvolvimento e aplicações da ressonância magnética nuclear em produtos e processos de interesse agropecuário
• Beneficiário: Luiz Alberto Colnago
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 17/20973-4 - Nanofibras eletrofiadas coaxiais à base de quitosana para a liberação controlada de antibióticos e aplicações no tratamento de lesões periodontais
• Beneficiário: Danilo Martins dos Santos
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 16/20970-2 - Estudo de quitosanas e derivados hidrofílicos por RMN no domínio do tempo
• Beneficiário: William Marcondes Facchinatto
• Modalidade de apoio: Bolsas no Brasil - Doutorado