Ethylene scavenging properties from hydroxypropyl methylcellulose-TiO 2 and gelatin-TiO 2 nanocomposites on polyethylene supports for fruit application.

Autor: Fonseca JM; Laboratory of Physical Properties of Foods, Chemical and Food Engineering Department, Federal University of Santa Catarina, UFSC, Brazil. Electronic address: jessicamatosfonseca@gmail.com., Pabón NYL; Laboratory of Heat Pipes, Mechanical Engineering Department, Federal University of Santa Catarina, UFSC, Brazil., Valencia GA; Laboratory of Physical Properties of Foods, Chemical and Food Engineering Department, Federal University of Santa Catarina, UFSC, Brazil., Nandi LG; Laboratory of Physical Properties of Foods, Chemical and Food Engineering Department, Federal University of Santa Catarina, UFSC, Brazil., Dotto MER; Laboratory of Organic Optoelectronics and Anisotropic Systems, Physics Department, Federal University of Santa Catarina, UFSC, Brazil., Moreira RFPM; Laboratory of Energy and Environment, Chemical and Food Engineering Department, Federal University of Santa Catarina, UFSC, Brazil., Monteiro AR; Laboratory of Physical Properties of Foods, Chemical and Food Engineering Department, Federal University of Santa Catarina, UFSC, Brazil. Electronic address: alcilene.fritz@ufsc.br.
Jazyk: angličtina
Zdroj: International journal of biological macromolecules [Int J Biol Macromol] 2021 May 01; Vol. 178, pp. 154-169. Date of Electronic Publication: 2021 Feb 24.
DOI: 10.1016/j.ijbiomac.2021.02.160
Abstrakt: Several technologies have been proposed to preserve fruits and to avoid postharvest losses. The degradation of ethylene produced by the fruits using TiO 2 photocatalysis has shown to be a good option to delay the ripening of fruits. This paper proposed a new application of biopolymers-TiO 2 nanocomposites developed to extend the shelf-life of fruits. Photocatalytic coatings were applied on the expanded polyethylene foam nets to degrade ethylene. Gelatin and hydroxypropyl methylcellulose (HMPC) were tested as hydrophobic and hydrophilic matrices for the TiO 2 incorporation. First, nanocomposite films prepared by casting were evaluated with regards to their photocatalytic properties. Both matrices, which were loaded with 1 wt% TiO 2 , degraded 40% of the ethylene injected in a batch reactor. By Langmuir-Hinshelwood model, ethylene degradation using gelatin-TiO 2 films (k app  = 0.186 ± 0.021 min -1 ) was faster than the HPMC-TiO 2 films (k app  = 0.034 ± 0.003 min -1 ). Then, gelatin-TiO 2 dispersion was applied as a coating on the foam nets by dip coating. The gelatin-TiO 2 bilayer exhibited higher concentration of ethylene degraded per photocatalytic area and photocatalyst mass unit (13.297 ± 0.178 ppmv m 2 [Formula: see text] ) than its film form (18.212 ± 1.157 ppmv m 2 [Formula: see text] ), which makes gelatin-TiO 2 /foam nets a promising composite design for fruit postharvest application.
Competing Interests: Declaration of competing interest None.
(Copyright © 2021 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: