@misc{10481/109479,
year = {2023},
month = {7},
url = {https://hdl.handle.net/10481/109479},
abstract = {Protein concentrates, extracted from the by-products of Hemp (Cannabis sativa), Cardoon (Cynara cardunculus),
and Argan (Argania spinosa L.) oilseeds after oil extraction, were utilized to produce sustainable and eco-friendly
protein-based bioplastics. The surface wettability and roughness of these bioplastics were investigated due to the
pivotal role of these parameters in their application in food packaging sector. Advancing contact angle value
revealed that Argan protein-based bioplastic is the most hydrophobic (θ > 90◦) while Cardoon protein-based film
is the most hydrophilic (θ < 40◦). These results are then supported by the roughness of wet film surfaces and their
swelling ratio, where Cardoon-based bioplastics and Argan-based bioplastics have also the lowest and the highest
roughness average, respectively. The measured hydrophilicity of the produced bioplastics motivates a detailed
investigation of the surface activity of protein concentrates used for film formation which can determine the
packaging by coating. Adsorption/desorption kinetics, surface tension and dilatational rheology are reported at
two different pHs values (10 and 12). The three protein concentrates are surface active and develop stable
adsorbed layers at the air-water interface after 1 h. Cardoon proteins showed the same final surface tension (>45
mN m􀀀 1) at both pHs, while Argan and Hemp proteins displayed lower values than Cardoon, especially at pH 12
(<40 mN m􀀀 1), indicative of higher surface activity. Finally, Argan protein adsorbed more irreversibly, followed
by Hemp protein while Cardoon protein provides the largest partial desorption from the surface. Combined
analysis of the data features a correlation between the higher advancing contact angle of Hemp protein-based
bioplastic and higher hydrophobicity, less swelling, faster adsorption kinetics, lower surface tension and more
irreversible adsorption of protein. These apply for Hemp and Cardoon protein concentrates and their driven
bioplastics while the presence of free oil in Argan protein concentrate and its bioplastic hinders the correlation
between different phenomena. The new interconnections highlighted between film properties and surface
adsorption could potentially be employed in food packaging and coating technology.},
organization = {This research was funded by the grant PRIN: Progetti di Ricerca di
Interesse Nazionale –Bando 2017– “CARDoon valorisation by InteGrAted
biorefiNery (CARDIGAN)” of Italian Ministero dell’Universit`a e
della Ricerca (COD. 2017KBTK93), Italy. JMV acknowledges support
from project PID 2020-116615RA-I00 funded by MCIN/AEI/10.13039/
501100011033, MARV acknowledges support from project PID 2020-
116082 GB-I00 (Ministerio de Ciencia e Innovaci´on, Spain). PFII acknowledges
Margarita Salas grant (Ministerio de Universidades, Spain,
Next Generation EU).},
keywords = {Adsorption},
keywords = {Contact angle},
keywords = {Desorption},
keywords = {Film-casting},
keywords = {Protein concentrate},
keywords = {Seed oilcake},
keywords = {Surface tension},
title = {Surface activity of protein extracts from seed oil by-products and wettability of developed bioplastics},
doi = {10.1016/j.foodhyd.2023.109091},
author = {Mirpoor, Seyedeh Fatemeh and Ibáñez-Ibañéz, Pablo F. and Giosafatto, C. Valeria L. and del Castillo-Sanataella, Teresa and Rodriguez-Valverde, Miguel Angel and Maldonado-Valderrama, Julia},
}