Two important biophysical properties,\u00a0the\u00a0thermal and UV-Vis screening capacity,\u00a0of\u00a0isolated\u00a0tomato\u00a0fruit\u00a0cuticle\u00a0membranes\u00a0(CM) have been studied by differential scanning calorimetry (DSC) and UV-Vis spectrometry, respectively. A first order melting, corresponding to waxes, and a second order glass transition (T-g) thermal events have been observed.\u00a0The\u00a0glass transition was less defined and displaced toward higher temperatures along\u00a0the\u00a0fruit\u00a0ripening. In immature and mature green fruits,\u00a0the\u00a0CM was always in\u00a0the\u00a0viscous and more fluid state but, in ripe fruits, daily and seasonal temperature fluctuations may cause\u00a0the\u00a0transition between\u00a0the\u00a0glassy and viscous states altering\u00a0the\u00a0mass transfer between\u00a0the\u00a0epidermal plant cells and\u00a0the\u00a0environment. CM dewaxing reduced\u00a0the\u00a0T-g value, as derived from\u00a0the\u00a0role\u00a0of\u00a0waxes as fillers. T-g reduction was more intense after polysaccharide removal due to their highly interwoven distribution within\u00a0the\u00a0cutin matrix that restricts\u00a0the\u00a0chain mobility. Such effect was amplified by\u00a0the\u00a0presence\u00a0of\u00a0phenolic compounds in ripe\u00a0cuticle\u00a0membranes.\u00a0The\u00a0structural rigidity induced by phenolics in\u00a0tomato\u00a0CMs was directly reflected in their mechanical elastic modulus.\u00a0The\u00a0heat\u00a0capacity (Cp-rev)\u00a0of\u00a0cuticle\u00a0membranes\u00a0was found to depend on\u00a0the\u00a0developmental stage\u00a0of\u00a0the\u00a0fruits and was higher in immature and green stages.\u00a0The\u00a0average Cp-rev value was above\u00a0the\u00a0one\u00a0of\u00a0air, which confers\u00a0heat\u00a0regulation capacity to CM.\u00a0Cuticle\u00a0membranes\u00a0screened\u00a0the\u00a0UV-B\u00a0light\u00a0by 99% irrespectively\u00a0the\u00a0developmental stage\u00a0of\u00a0the\u00a0fruit. As intra and epicuticular waxes contributed very little to\u00a0the\u00a0UV screening, this protection capacity is attributed to\u00a0the\u00a0absorption by cinnamic acid derivatives. However,\u00a0the\u00a0blocking capacity toward UV-A is mainly due to\u00a0the\u00a0CM thickness increment during growth and to\u00a0the\u00a0absorption by flavone chalconaringenin accumulated during ripening.\u00a0The\u00a0build-up\u00a0of\u00a0phenolic compounds was found to be an efficient mechanism to regulate both\u00a0the\u00a0thermal and UV screening properties\u00a0of\u00a0cuticle\u00a0membranes.<\/p>\n","protected":false},"excerpt":{"rendered":"
Two important biophysical properties,\u00a0the\u00a0thermal and UV-Vis screening capacity,\u00a0of\u00a0isolated\u00a0tomato\u00a0fruit\u00a0cuticle\u00a0membranes\u00a0(CM) have been studied by differential scanning calorimetry (DSC) and UV-Vis spectrometry, respectively. A first order melting, corresponding to waxes, and a second order glass transition (T-g) thermal events have been observed.\u00a0The\u00a0glass transition was less defined and displaced toward higher temperatures along\u00a0the\u00a0fruit\u00a0ripening. In immature and mature green fruits,\u00a0the\u00a0CM…<\/p>\n","protected":false},"featured_media":0,"template":"","autores":[],"grupos_de_investigacion":[6508],"revistas":[2735],"anos":[884],"class_list":["post-24845","articulos_sci","type-articulos_sci","status-publish","hentry","grupos_de_investigacion-materiales-para-energia-y-sostenibilidad","revistas-frontiers-in-plant-science","anos-884","description-off"],"acf":[],"_links":{"self":[{"href":"https:\/\/icmsva.vallealto.es\/index.php?rest_route=\/wp\/v2\/articulos_sci\/24845","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/icmsva.vallealto.es\/index.php?rest_route=\/wp\/v2\/articulos_sci"}],"about":[{"href":"https:\/\/icmsva.vallealto.es\/index.php?rest_route=\/wp\/v2\/types\/articulos_sci"}],"version-history":[{"count":0,"href":"https:\/\/icmsva.vallealto.es\/index.php?rest_route=\/wp\/v2\/articulos_sci\/24845\/revisions"}],"wp:attachment":[{"href":"https:\/\/icmsva.vallealto.es\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=24845"}],"wp:term":[{"taxonomy":"autores","embeddable":true,"href":"https:\/\/icmsva.vallealto.es\/index.php?rest_route=%2Fwp%2Fv2%2Fautores&post=24845"},{"taxonomy":"grupos_de_investigacion","embeddable":true,"href":"https:\/\/icmsva.vallealto.es\/index.php?rest_route=%2Fwp%2Fv2%2Fgrupos_de_investigacion&post=24845"},{"taxonomy":"revistas","embeddable":true,"href":"https:\/\/icmsva.vallealto.es\/index.php?rest_route=%2Fwp%2Fv2%2Frevistas&post=24845"},{"taxonomy":"anos","embeddable":true,"href":"https:\/\/icmsva.vallealto.es\/index.php?rest_route=%2Fwp%2Fv2%2Fanos&post=24845"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}