RT dataset
T1 Fully bio-based films based on purified biopolymer fractions from hydrothermal extraction of discarded carrots
A1 Ramos Andrés, Marta
A1 Hu, Liqiu
A1 Grénman, Henrik
A1 Xu, Chunlin
A1 García Serna, Juan
A2 Universidad de Valladolid. Instituto de Bioeconomía  (BioEcoUVa)
AB Flexible 100 % bio-based films were produced from discarded carrots fractions. The main ingredient was purified high molecular weight fractions of hemicelluloses and pectins previously obtained by hydrothermal treatment and ultrafiltration/diafiltration. A fraction of lignin-containing cellulose nanofibers was used as an additive. These nanofibers were obtained from the residual pulp of the hydrothermal treatment after a mechanical treatment. Low content of lignin-cellulose nanofibers (< 5 % w/w) improved oxygen permeability (up to 29 %) but worsened water vapor permeability and tensile properties. A higher addition of lignin-cellulose nanofibers (5-25 % w/w) allowed to recover the properties of the reference film (without fibers) and provided a higher hydrophobicity, increasing the water contact angle from 79.9° to 125.8°. The study of the influence of the molecular weight (67.77-102.75 kDa) and composition of the hemicellulose and pectin fraction in films containing 1 % lignin-cellulose nanofibers showed that a higher molecular weight decreased oxygen permeability (from 48.18 to 41.14 cm3·µm/m2/kPa/day), increased water vapor permeability (from 21.56 to 24.01 g·mm/m2/kPa/day) and decreased hydrophobicity (from 86.84° to 71.10°). Tensile stress was higher with higher pectin content and lower molecular weight (from 1.13 to 2.84 MPa), while elongation was higher with higher hemicellulose content (from 5.92 to 15.28 %). The obtained films had acceptable properties for food packaging and high hydrophobicity, with the great advantage of being 100 % from agri-food waste by applying environmentally friendly processes and without the need for chemical modification.
YR 2023
FD 2023
LK https://uvadoc.uva.es/handle/10324/58434
UL https://uvadoc.uva.es/handle/10324/58434
LA eng
NO Grupo de Tecnologías a Presión (PressTech)
DS UVaDOC
RD 19-may-2024