Phosphorylated cellulose nanofibrils from sugarcane bagasse with pH tunable gelation

Autor(es)

Messa, Lucas Luiz ; Faez, Roselena ; Hsieh, You-Lo

• Tipo de documento: Artigo Científico
• Fonte: CARBOHYDRATE POLYMER TECHNOLOGIES AND APPLICATIONS; v. 2, p. 8-pg., 2021-12-25.

Resumo

A facile strategy is reported to convert sugarcane bagasse (SCB) cellulose into phosphorylated cellulose nanofibrils (PCNFs) whose gelation is pH-dependent via the different ionic forms of phosphoric groups (H2PO4-, HPO4-2, PO4-3). Cellulose was isolated from SCB at a 42.1% yield, then phosphorylated at an optimized 1:0.5:2 anhydroglucose (AHG)/(NH4)(2)HPO4 /CO(NH2)(2) molar ratio and, at pH 12, was in the most charged phosphate (PO4-3) to be disintegrated to generate 84.3% PCNFs. PCNFs were 3.84 nm wide, 0.73 nm high, up to 500 nm long, and highly charged (2.56 mmol g(-1)). Aqueous PCNF exhibited strongly pH-dependent gelation, gelling at 1.4 wt.% at pH 12 and at lowered 1.0 and 0.8 wt% at pH 7 and 2, respectively, enabling potential applications in full range of pH. (AU)

• Processo FAPESP: 19/02535-5 - Estruturas poliméricas como matrizes hospedeiras para nutrientes de liberação programada: fertilizantes ambientalmente amigáveis
• Beneficiário: Roselena Faez
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 19/08057-8 - Biocompósitos ferti-liberadores à base de quitosana e celulose obtidos pela técnica spray drying
• Beneficiário: Lucas Luiz Messa
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado Direto