| Full text | |
| Author(s): |
Chen, Jingwen
;
Okamoto-schalch, Nadia O.
;
Dalben, Maria Gabriela B.
;
Domenek, Sandra
;
Chevigny, Chloe
;
Almeida, Giana
;
Martelli-tosi, Milena
Total Authors: 7
|
| Document type: | Journal article |
| Source: | Journal of Applied Polymer Science; v. N/A, p. 13-pg., 2026-01-19. |
| Abstract | |
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) | |
| FAPESP's process: | 22/03469-9 - Production of loaded particles and nanocelluloses from agro-industrial by-products: potential application in active coatings or PLA films |
| Grantee: | Milena Martelli Tosi |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 23/05286-1 - Production and characterization of charged particles with active compounds |
| Grantee: | Nadia Obrownick Okamoto Schalch |
| Support Opportunities: | Scholarships in Brazil - Technical Training Program - Technical Training |
| FAPESP's process: | 23/10790-0 - Obtaining nanocelluloses from agro-industrial by-products |
| Grantee: | Maria Gabriela Barreto Dalben |
| Support Opportunities: | Scholarships in Brazil - Technical Training Program - Technical Training |