BUSCADOR RECOLECTA

Conjunto de datos procedente del registro de las variables de operación de las Unidades de Tratamiento de Aire de los quirófanos del Hospital Universitario Río Hortega, durante períodos de funcionamiento en los meses de abril, julio, agosto y diciembre de 2019, y enero 2020. Utilizados para el estudio de la conveniencia del funcionamiento en modo Setback., Universidad de Valladolid. Instituto de Tecnologías Avanzadas de la Producción (ITAP), Universidad de Valladolid. Grupo de Termotecnia, LIFE Programme, LIFE SMART HOSPITAL project (ENV/ES/001013)., ENTE REGIONAL DE LA ENERGÍA de Castilla y León (EREN_2019_L2_UVA)

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., Grupo de Tecnologías a Presión (PressTech), Agencia Estatal de Investigación (Gobierno de España) and FEDER Funds EU [PID2019-105975GB-I00 (MICINN/FEDER, EU)], Junta de Castilla y León - Consejería de Educación and FEDER Funds [CLU-2019-04]

Discarded carrots were valorized to obtain different films. The pulp was subjected to hydrothermal treatment (140 and 180 °C) at pilot scale, with one and with several flow-through reactors in series, allowing the extraction of pectin-containing arabinogalactan (P-AG) of very high molecular weight. Ultrafiltration and diafiltration allowed obtaining purified fractions with molecular weights be-tween 3.48-102.75 kDa. The solid residue from the hydrothermal process was subjected to mechanical treatments to obtain lignin-containing cellulose nanofibers (L-CNFs). The P-AG film had a better oxygen barrier (67.73 vs. 239.83 cm3·µm/m2/kPa/day) and the L-CNFs film had a higher tensile strength (7.74 vs. 3.14 MPa). The combination of both fractions showed that L-CNFs should be added in percentages higher than 15 % (w/w) so that their presence does not harm the P-AG based film. There was a synergistic effect on hydrophobicity when mixing both fractions, reaching a 57.5 % higher water contact angle (125.8 °). As for the P-AG sample, a higher molecular weight decreased the oxygen permeability up to 14.6 % (41.14 cm3·µm/m2/kPa/day) but increased the water vapor permeability up to 11.4 % (24.01 g·mm/m2/kPa/day). The tensile strength was up to 150.9 % higher at lower molecular weight and higher pectin content (2.84 MPa) due to the high degree of branching of the arabinogalactan. Elongation was up to 157.9 % higher at higher arabinogalactan content (15.28 %). For the first time, purified fractions of P-AG and L-CNFs from carrot waste were obtained and used for film formation. The films had acceptable properties for food-packaging., Grupo de Tecnologías a Presión (PressTech), Instituto de Bieconomía de la Universidad de Valladolid, Agencia Estatal de Investigación (Gobierno de España) and FEDER Funds EU [PID2019-105975GB-I00 (MICINN/FEDER, EU)] Junta de Castilla y León - Consejería de Educación and FEDER Funds [CLU-2019-04]