{"id":24711,"date":"2026-03-15T10:30:37","date_gmt":"2026-03-15T09:30:37","guid":{"rendered":"https:\/\/www.ilerfred.com\/?p=24711"},"modified":"2026-02-11T12:48:17","modified_gmt":"2026-02-11T11:48:17","slug":"hydrocooling-en-enciam-postcollita","status":"publish","type":"post","link":"https:\/\/www.ilerfred.com\/ca\/hydrocooling-en-enciam-postcollita\/","title":{"rendered":"Hydrocooling en enciam postcollita"},"content":{"rendered":"<h1>L\u2019hydrocooling com a estrat\u00e8gia clau per preservar la qualitat i prolongar la vida \u00fatil de l\u2019enciam<\/h1>\n<p>L.<em>Torregrosa<\/em>, departament I+D+i, Industrial Leridana del Fr\u00edo SLU, C. Josep Segura i Farr\u00e9, 706, 25191, Lleida<\/p>\n<h2>Introducci\u00f3: rellev\u00e0ncia del prerefredament en hortalisses de fulla<\/h2>\n<p>Les hortalisses de fulla, i en particular l\u2019enciam, presenten una fisiologia altament susceptible a la deshidrataci\u00f3 i al deteriorament accelerat despr\u00e9s de la collita. La p\u00e8rdua d\u2019aigua postcollita constitueix un dels principals vectors de degradaci\u00f3, tradu\u00eft en p\u00e8rdua de pes, reducci\u00f3 de la turg\u00e8ncia, marceixament i disminuci\u00f3 de la qualitat t\u00e8xtil. En aquest context, la gesti\u00f3 t\u00e8rmica \u00e9s el factor de control m\u00e9s determinant en el maneig de mat\u00e8ries primeres destinades tant a producte fresc sencer com a IV gamma.<\/p>\n<p>El prerefredament constitueix una etapa cr\u00edtica per eliminar de manera r\u00e0pida la calor de camp i disminuir la taxa respirat\u00f2ria, amb un impacte directe sobre l\u2019extensi\u00f3 de la vida \u00fatil i el manteniment dels par\u00e0metres de qualitat. En condicions de temperatures elevades de collita, qualsevol retard en el refredament incrementa notablement la p\u00e8rdua de qualitat. Entre les tecnologies disponibles (refredament en cambra, aire for\u00e7at, buit i hydrocooling), l\u2019hydrocooling (HC) destaca per a l\u2019enciam per la seva efici\u00e8ncia t\u00e8rmica, aport h\u00eddrics i robustesa davant variacions ambientals.<\/p>\n<h2>Efic\u00e0cia i velocitat de reducci\u00f3 de temperatura<\/h2>\n<p>L\u2019hydrocooling es basa en la transfer\u00e8ncia t\u00e8rmica per contacte directe mitjan\u00e7ant una dutxa cont\u00ednua d\u2019aigua freda, cosa que afavoreix coeficients de refredament molt superiors als obtinguts per aire.<\/p>\n<ol>\n<li><strong>Descens r\u00e0pid de la calor de camp<\/strong><\/li>\n<\/ol>\n<p>Assajos en enciam iceberg \u2018Lucy Brown\u2019 mostren que la major part de la calor de camp s\u2019elimina en els primers 10 minuts a 4 \u00b0C. En enciam llis \u2018Vit\u00f3ria de Santo Ant\u00e3o\u2019, 5 minuts de HC a 4 \u00b0C van reduir la temperatura interna de 20 \u00b0C a 8,1 \u00b0C, evidenciant una elevada conductivitat t\u00e8rmica efectiva.<\/p>\n<ol>\n<li><strong>Disminuci\u00f3 de la taxa respirat\u00f2ria<\/strong><\/li>\n<\/ol>\n<p>El HC i el buit (VC) s\u00f3n els sistemes que redueixen la temperatura de manera m\u00e9s eficient a trav\u00e9s de la massa del producte. Aix\u00f2 \u00e9s vital per disminuir la taxa de respiraci\u00f3. Durant les campanyes de primavera\u2013estiu, on la temperatura inicial de collita \u00e9s elevada, ambd\u00f3s m\u00e8todes van aconseguir reduir significativament la taxa respirat\u00f2ria. La cin\u00e8tica de refredament del HC s\u2019aproxima a la del VC (~30 min), i supera \u00e0mpliament la velocitat de l\u2019aire for\u00e7at, que pot requerir m\u00e9s de 20 hores per assolir condicions \u00f2ptimes.<\/p>\n<h2>Manteniment de la hidrataci\u00f3 i prolongaci\u00f3 de la vida \u00fatil<\/h2>\n<p>L\u2019hydrocooling aporta un avantatge determinant en hortalisses de fulla: el manteniment de la hidrataci\u00f3 del producte.<\/p>\n<ol>\n<li><strong>Prevenci\u00f3 de la deshidrataci\u00f3 i manteniment de la turg\u00e8ncia:<\/strong><\/li>\n<\/ol>\n<p>El contacte directe amb aigua freda redueix la p\u00e8rdua d\u2019humitat i pot rehidratar lleugerament el teixit foliar, recuperant la turg\u00e8ncia en mostres amb s\u00edmptomes inicials de marceixament i mantenint una aparen\u00e7a m\u00e9s fresca.<\/p>\n<ol>\n<li><strong>Conservaci\u00f3 del contingut d\u2019aigua<\/strong><\/li>\n<\/ol>\n<p>Les enciams sotmeses a HC i emmagatzemades a 5 \u00b0C van mantenir nivells significativament superiors d\u2019humitat foliar respecte als lots sense prerefredament.<\/p>\n<ol>\n<li><strong>Increment de la vida \u00fatil<\/strong><\/li>\n<\/ol>\n<p>Els efectes de l\u2019hydrocooling sobre la hidrataci\u00f3 i la reducci\u00f3 de l\u2019activitat metab\u00f2lica es tradueixen en millores quantificables:<\/p>\n<ul>\n<li>En enciam llis, HC + emmagatzematge a 5 \u00b0C va incrementar la vida \u00fatil un 20% (de 5 a 6 dies).<\/li>\n<li>A 22 \u00b0C, el HC va duplicar la vida \u00fatil (d\u20191,5 a 3 dies).<\/li>\n<li>En iceberg \u2018Lucy Brown\u2019, el HC va retardar el marceixament extern 3 dies a 5 \u00b0C i 2 dies a 22 \u00b0C.<\/li>\n<\/ul>\n<ol>\n<li><strong>Millora dels par\u00e0metres visuals<\/strong><\/li>\n<\/ol>\n<p>Les mostres tractades mitjan\u00e7ant HC o VC van presentar una major saturaci\u00f3 de color (croma) despr\u00e9s del processament, coherent amb un major contingut d\u2019aigua al teixit.<\/p>\n<h2>Avantatges qualitatius i compatibilitat varietal<\/h2>\n<ul>\n<li><strong>Preservaci\u00f3 de la integraci\u00f3 cel\u00b7lular:<\/strong> Tot i que el VC proporciona velocitats de refredament similars, en fulles delicades pot generar lesions estructurals o deteriorament visual a causa de la dessecaci\u00f3 interna per evaporaci\u00f3 intensa. El HC no va presentar aquests efectes, mostrant una major compatibilitat amb teixits sensibles.<\/li>\n<li><strong>Control microbiano:<\/strong> El rentat durant el HC va reduir de manera significativa els recuentos de <em>Pseudomonas<\/em>, sense afavorir el desenvolupament microbiano posterior; fins i tot en pres\u00e8ncia d\u2019aigua residual no es va promoure el desenvolupament de microorganismes ni putrefacci\u00f3.<\/li>\n<li><strong>Adaptaci\u00f3 a diferents cultivares:<\/strong> Per a varietats com \u2018Great Lakes 54\u2019, \u2018Trocadero\u2019 i \u2018Gigante degli Ortolani\u2019, el HC ha demostrat ser el m\u00e8tode m\u00e9s adequat, reduint el percentatge de fulles descartades i mantenint la fermesa al final del per\u00edode comercial.<\/li>\n<\/ul>\n<h2>Conclusi\u00f3<\/h2>\n<p>L\u2019aplicaci\u00f3 de l\u2019hydrocooling immediatament despr\u00e9s de la collita constitueix una estrat\u00e8gia altament efica\u00e7 i recomanable per al maneig postcollita de l\u2019enciam, especialment en escenaris de temperatures ambientals altes. Els seus principals avantatges inclouen:<\/p>\n<ul>\n<li>Reducci\u00f3 r\u00e0pida de la temperatura de camp.<\/li>\n<li>Hidrataci\u00f3 del producte i preservaci\u00f3 de la turg\u00e8ncia.<\/li>\n<li>Prolongaci\u00f3 significativa de la vida \u00fatil tant en refrigeraci\u00f3 com a temperatura ambient.<\/li>\n<li>Protecci\u00f3 de la integritat estructural davant danys associats a tecnologies com el VC.<\/li>\n<\/ul>\n<p>La integraci\u00f3 del HC amb una cadena de fred estable a 5 \u00b0C representa la combinaci\u00f3 m\u00e9s eficient per maximitzar la qualitat, reduir merma i millorar la rendibilitat al llarg de tota la cadena de subministrament.<\/p>\n<h3>Bibliografia<\/h3>\n<ol>\n<li>\n<blockquote><p>Fran\u00e7a, C. F. M., Santos, M. N. S., Ribeiro, W. S., Cecon, P. R., &amp; Finger, F. L. (2018). <em>Shelf life of iceberg lettuce affected by hydro cooling and temperature of storage.<\/em> Advances in Horticultural Science, 32(3), 319\u2013324. <a href=\"https:\/\/doi.org\/10.13128\/ahs-21978\">https:\/\/doi.org\/10.13128\/ahs-21978<\/a><\/p><\/blockquote>\n<\/li>\n<li>\n<blockquote><p>Kongwong, P., Boonyakiat, D., &amp; Poonlarp, P. (2019). <em>Extending the shelf life and qualities of baby cos lettuce using commercial precooling systems.<\/em> Postharvest Biology and Technology, 150(December 2018), 60\u201370. <a href=\"https:\/\/doi.org\/10.1016\/j.postharvbio.2018.12.012\">https:\/\/doi.org\/10.1016\/j.postharvbio.2018.12.012<\/a><\/p><\/blockquote>\n<\/li>\n<li>\n<blockquote><p>Garrido, Y., Tudela, J. A., &amp; Gil, M. I. (2015). <em>Comparison of industrial precooling systems for minimally processed baby spinach.<\/em> Postharvest Biology and Technology, 102, 1\u20138. <a href=\"https:\/\/doi.org\/10.1016\/j.postharvbio.2014.12.003\">https:\/\/doi.org\/10.1016\/j.postharvbio.2014.12.003<\/a><\/p><\/blockquote>\n<\/li>\n<li>\n<blockquote><p>Fran\u00e7a, C. F. M., Ribeiro, W. S., Silva, F. C., Costa, L. C., R\u00eago, E. R., &amp; Finger, F. L. (2015). <em>Hydrocooling on postharvest conservation of butter lettuce.<\/em> Horticultura Brasileira, 33, 383\u2013387. <a href=\"https:\/\/doi.org\/http:\/dx.doi.org\/10.1590\/S0102-053620150000300018\">https:\/\/doi.org\/http:\/\/dx.doi.org\/10.1590\/S0102-053620150000300018<\/a><\/p><\/blockquote>\n<\/li>\n<li>\n<blockquote><p>Gorini, F., Borinelli, G., &amp; Uncini, L. (1974). <em>Some trials of salad precooling.<\/em> ISHS Acta Horticulturae 38: Symposium on Vegetable Storage. <a href=\"https:\/\/doi.org\/10.17660\/ActaHortic.1974.38.37\">https:\/\/doi.org\/10.17660\/ActaHortic.1974.38.37<\/a><\/p><\/blockquote>\n<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>L\u2019hydrocooling com a estrat\u00e8gia clau per preservar la qualitat i prolongar la vida \u00fatil de l\u2019enciam L.Torregrosa, departament I+D+i, Industrial Leridana del Fr\u00edo SLU, C. Josep Segura i Farr\u00e9, 706, 25191, Lleida Introducci\u00f3: rellev\u00e0ncia del [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":24894,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_ilerfred_token_variable":"token","_ilerfred_token_code":"","_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[26],"tags":[88,79,78,90,91,89,80,95,92,93,94,84],"class_list":["post-24711","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-noticies","tag-cadena-de-fred","tag-cadena-de-frio-ca","tag-cadena-de-frio","tag-conservacio","tag-enciam","tag-fred-industrial","tag-frio-industrial-ca","tag-hydrocooling-ca","tag-postcollita","tag-prerefredament","tag-sostenibilitat","tag-sostenible-ca"],"yoast_head":"<!-- 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