Autor(es)

Chen, Jingwen ; Okamoto-schalch, Nadia O. ; Dalben, Maria Gabriela B. ; Domenek, Sandra ; Chevigny, Chloe ; Almeida, Giana ; Martelli-tosi, Milena

• Tipo de documento: Artigo Científico
• Fonte: Journal of Applied Polymer Science; v. N/A, p. 13-pg., 2026-01-19.

Resumo

This study investigated two types of lignin-containing nanocelluloses derived from grape pomace and their applications as coatings on PLA. First, bleached and unbleached grape pomace-derived nanocelluloses (BGNC and UGNC) were extracted. Atomic force microscopy (AFM) and transmission electron microscopy (TEM) revealed a mix of nanofibrils and well-defined nanocrystals from BGNC and only nanofibrils from UGNC. BGNC exhibited a higher crystallinity (25.2%) compared to UGNC (20.2%), both with preserved native cellulose type I structure. Thermogravimetric analysis (TGA) showed that residual lignin was present in both samples although strongly reduced after bleaching. BGNC or UGNC coatings were applied via bar-coating at theoretical thicknesses of 90, 140, and 1540 nm. Due to its higher lignin content, the UGNC-coated surface was more hydrophobic, an interesting property for packaging, while the BGNC-coated film showed better oxygen barrier properties thanks to its higher crystallinity and more uniform coating. BGNC-coated film exhibited a good oxygen barrier with a permeability (OP) of 5.91 x 10-19 m3 m/m2 s Pa at 90 nm thickness, while the UGNC-coated film only reached 9.40 x 10-19 m3 m/m2 s Pa. The oxygen barrier and hydrophobicity are both promising features, highlighting the potential application of by-product-derived nanocelluloses for bio-based, compostable food packaging and the interest of lower-impact chemical extractions to develop original properties. (AU)

• Processo FAPESP: 22/03469-9 - Produção de partículas carregadas e de nanoceluloses a partir de subprodutos agroindustriais: aplicação potencial em coberturas ativas ou filmes de PLA
• Beneficiário: Milena Martelli Tosi
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 23/05286-1 - Produção e caracterização de partículas carregadas com compostos ativos
• Beneficiário: Nadia Obrownick Okamoto Schalch
• Modalidade de apoio: Bolsas no Brasil - Programa Capacitação - Treinamento Técnico
• Processo FAPESP: 23/10790-0 - Obtenção de nanoceluloses a partir de subprodutos agroindustriais
• Beneficiário: Maria Gabriela Barreto Dalben
• Modalidade de apoio: Bolsas no Brasil - Programa Capacitação - Treinamento Técnico