<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Rodrigues, R</style></author><author><style face="normal" font="default" size="100%">S. I. C. J. Palma</style></author><author><style face="normal" font="default" size="100%">Correia, V.J.</style></author><author><style face="normal" font="default" size="100%">Padrao, I.</style></author><author><style face="normal" font="default" size="100%">Pais, J.</style></author><author><style face="normal" font="default" size="100%">Banza, M.</style></author><author><style face="normal" font="default" size="100%">Alves, C.</style></author><author><style face="normal" font="default" size="100%">Deuermeier, J.</style></author><author><style face="normal" font="default" size="100%">Martins, C.</style></author><author><style face="normal" font="default" size="100%">Costa, HMA</style></author><author><style face="normal" font="default" size="100%">Ramou, E.</style></author><author><style face="normal" font="default" size="100%">Silva Pereira, C.</style></author><author><style face="normal" font="default" size="100%">Roque, A. C. A.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Sustainable plant polyesters as substrates for optical gas sensors</style></title><secondary-title><style face="normal" font="default" size="100%">Materials Today Bio</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2020</style></year></dates><urls><related-urls><url><style face="normal" font="default" size="100%">https://sites.fct.unl.pt/sites/default/files/biomolecular_eng/files/2020_rodrigues_suberin.pdf</style></url></related-urls></urls><volume><style face="normal" font="default" size="100%">8</style></volume><pages><style face="normal" font="default" size="100%">100083</style></pages><abstract><style face="normal" font="default" size="100%">&lt;p&gt;The fast and non-invasive detection of odors and volatile organic compounds (VOCs) by gas sensors and electronic&lt;br /&gt;
noses is a growing field of interest, mostly due to a large scope of potential applications. Additional drivers for the&lt;br /&gt;
expansion of the field include the development of alternative and sustainable sensing materials. The discovery&lt;br /&gt;
that isolated cross-linked polymeric structures of suberin spontaneously self-assemble as a film inspired us to&lt;br /&gt;
develop new sensing composite materials consisting of suberin and a liquid crystal (LC). Due to their stimuliresponsive and optically active nature, liquid crystals are interesting probes in gas sensing. Herein, we report&lt;br /&gt;
the isolation and the chemical characterization of two suberin types (from cork and from potato peels) resorting to&lt;br /&gt;
analyses of gas chromatography–mass spectrometry (GC-MS), solution nuclear magnetic resonance (NMR), and Xray photoelectron spectroscopy (XPS). The collected data highlighted their compositional and structural differences. Cork suberin showed a higher proportion of longer aliphatic constituents and is more esterified than potato&lt;br /&gt;
suberin. Accordingly, when casted it formed films with larger surface irregularities and a higher C/O ratio. When&lt;br /&gt;
either type of suberin was combined with the liquid crystal 5CB, the ensuing hybrid materials showed distinctive&lt;br /&gt;
morphological and sensing properties towards a set of 12 VOCs (comprising heptane, hexane, chloroform,&lt;br /&gt;
toluene, dichlormethane, diethylether, ethyl acetate, acetonitrile, acetone, ethanol, methanol, and acetic acid).&lt;br /&gt;
The optical responses generated by the materials are reversible and reproducible, showing stability for 3 weeks.&lt;br /&gt;
The individual VOC-sensing responses of the two hybrid materials are discussed taking as basis the chemistry of&lt;br /&gt;
each suberin type. A support vector machines (SVM) algorithm based on the features of the optical responses was&lt;br /&gt;
implemented to assess the VOC identification ability of the materials, revealing that the two distinct suberin-based&lt;br /&gt;
sensors complement each other, since they selectively identify distinct VOCs or VOC groups. It is expected that&lt;br /&gt;
such new environmentally-friendly gas sensing materials derived from natural diversity can be combined in arrays&lt;br /&gt;
to enlarge selectivity and sensing capacity.&lt;/p&gt;
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