{"id":9656,"date":"2026-10-08T15:17:22","date_gmt":"2026-10-08T13:17:22","guid":{"rendered":"https:\/\/www.ever.it\/?p=9656"},"modified":"2026-10-12T11:35:03","modified_gmt":"2026-10-12T09:35:03","slug":"prevent-light-struck-taste-light-seven-stress","status":"publish","type":"post","link":"https:\/\/www.ever.it\/en\/prevent-light-struck-taste-light-seven-stress\/","title":{"rendered":"Preventing light-struck taste with Light Seven Stress: a predictive approach for the winery."},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"9656\" class=\"elementor elementor-9656 elementor-9655\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-e61af2d elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"e61af2d\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-2554805\" data-id=\"2554805\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-8efbbb4 elementor-widget elementor-widget-text-editor\" data-id=\"8efbbb4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Preserving the sensory profile of wine over time is one of the most complex challenges facing contemporary oenology. This requirement must now contend with the growing use of clear glass packaging to highlight the colour characteristics of ros\u00e9 and white wines. However, exposure to light triggers specific degradation processes, leading to the development of a defect known as \u2018<strong>light-struck taste<\/strong>\u2019 (LST).<br \/>This alteration results in the emergence of sulphurous notes (such as cooked cabbage, garlic and onion) and the loss of fruity characteristics and the wine\u2019s original freshness.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-556c45d elementor-widget elementor-widget-image\" data-id=\"556c45d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"469\" height=\"290\" src=\"https:\/\/www.ever.it\/wp-content\/uploads\/Bottiglia.jpg\" class=\"attachment-medium size-medium wp-image-9661\" alt=\"\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-219ed89 elementor-widget elementor-widget-text-editor\" data-id=\"219ed89\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2><span style=\"color: #a8153f;\">The biochemical mechanisms underlying light-induced changes.<\/span><\/h2><p>\u00a0<\/p><div><p>The phenomenon of light-induced taste is governed by a precise photochemical sequence mediated by riboflavin (Vitamin B2).<\/p><p>The process unfolds through a sequence of photochemical reactions:<\/p><ul><li>Photosensitisation: riboflavin absorbs light radiation in the spectrum ranging from 370 to 450 nm, transitioning to an excited state.<\/li><li>Substrate oxidation: in the excited state, the molecule oxidises methionine, a sulphur-containing amino acid naturally present in the medium.<\/li><li>Formation of sulphur-containing compounds: the reaction triggers the formation of methanethiol and dimethyl disulphide, which are primarily responsible for the onset of the \u2018light-induced taste\u2019.<\/li><li>Kinetics: the catalytic activity of riboflavin is extremely high; a single riboflavin molecule is capable of photo-oxidising up to 20 molecules of methionine. This renders the oenological matrix unstable even when exposed to light for only a short duration.<\/li><\/ul><\/div><h2><span style=\"color: #a8153f;\">Light Seven Stress: technology and working principle.<\/span><\/h2><p>To transform photochemical susceptibility from an unknown factor into a quantifiable analytical parameter prior to bottling, Ever has developed the Light Seven Stress (L7S), a patented portable instrument designed for the predictive determination of light-induced shelf life.<\/p><p>Unlike traditional empirical tests, the system is based on a matrix of high-intensity RGB (Red, Green, Blue) LEDs. This technology allows for the modulation of seven different light spectra, simulating the exposure of wine on shop shelves (under neon lighting for several months) according to the specific oenological profile.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t<div class=\"elementor-element elementor-element-87af9e6 e-grid e-con-full e-con e-parent\" data-id=\"87af9e6\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-cd311ad elementor-widget elementor-widget-image\" data-id=\"cd311ad\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"768\" height=\"512\" src=\"https:\/\/www.ever.it\/wp-content\/uploads\/dettaglio_1-768x512.jpg\" class=\"attachment-medium_large size-medium_large wp-image-9663\" alt=\"\" srcset=\"https:\/\/www.ever.it\/wp-content\/uploads\/dettaglio_1-768x512.jpg 768w, https:\/\/www.ever.it\/wp-content\/uploads\/dettaglio_1-1536x1024.jpg 1536w, https:\/\/www.ever.it\/wp-content\/uploads\/dettaglio_1.jpg 1572w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fdba45c elementor-widget elementor-widget-image\" data-id=\"fdba45c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1352\" height=\"901\" src=\"https:\/\/www.ever.it\/wp-content\/uploads\/dettaglio_2.jpg\" class=\"attachment-large size-large wp-image-9665\" alt=\"\" srcset=\"https:\/\/www.ever.it\/wp-content\/uploads\/dettaglio_2.jpg 1352w, https:\/\/www.ever.it\/wp-content\/uploads\/dettaglio_2-768x512.jpg 768w\" sizes=\"(max-width: 1352px) 100vw, 1352px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-e3d8e8e elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"e3d8e8e\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-dc83008\" data-id=\"dc83008\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-ca6efd8 elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"ca6efd8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-798cf54 elementor-widget elementor-widget-text-editor\" data-id=\"798cf54\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2><span style=\"color: #a8153f;\">Thermal decoupling.<br \/><\/span><\/h2><div><p>A critical factor in traditional irradiation tests is heat interference, which superimposes thermal ageing kinetics onto purely photochemical ones. The L7S device isolates the light variable through three measures:<\/p><\/div><ol><li>Passive heat dissipation: an aluminium structure with high thermal conductivity.<\/li><li>Physical isolation: separation of the irradiated samples by means of transparent plates.<\/li><li>Active temperature control: optional temperature regulation via the insertion of eutectic plates.<\/li><\/ol><h2><span style=\"color: #a8153f;\">Operational protocol and correlation metrics.<\/span><\/h2><p>The analysis method takes just a few minutes and can easily be incorporated into the winery\u2019s quality control procedures:<\/p><ul><li>Sampling: 40 mL of wine is taken and placed into airtight, transparent glass vials.<\/li><li>Loading: the vials are placed in the chamber of the L7S instrument.<\/li><li>Stress cycle: the instrument is activated for a period of between 10 and 20 minutes (with a standard reference time set at 15 minutes).<\/li><li>Evaluation: at the end of the cycle, the sample is subjected to a further organoleptic and analytical assessment..<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-65729ac elementor-widget elementor-widget-image\" data-id=\"65729ac\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"642\" height=\"145\" src=\"https:\/\/www.ever.it\/wp-content\/uploads\/Protocollo.jpg\" class=\"attachment-medium size-medium wp-image-9667\" alt=\"\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t<div class=\"elementor-element elementor-element-9ffc194 e-grid e-con-boxed e-con e-parent\" data-id=\"9ffc194\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-55b78a9 elementor-widget elementor-widget-text-editor\" data-id=\"55b78a9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2><span style=\"color: #a8153f; font-family: inherit; font-size: 2rem;\">Correlation between analytical and predictive parameters.<\/span><\/h2><p>The main operational parameters of the test are set out in the table below.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e833344 elementor-widget elementor-widget-image\" data-id=\"e833344\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"786\" height=\"380\" src=\"https:\/\/www.ever.it\/wp-content\/uploads\/Parametri.png\" class=\"attachment-medium size-medium wp-image-9669\" alt=\"\" srcset=\"https:\/\/www.ever.it\/wp-content\/uploads\/Parametri.png 786w, https:\/\/www.ever.it\/wp-content\/uploads\/Parametri-768x371.png 768w\" sizes=\"(max-width: 786px) 100vw, 786px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8332c00 elementor-widget elementor-widget-text-editor\" data-id=\"8332c00\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2>\u00a0<\/h2><h2 style=\"text-align: left;\"><span style=\"color: #a8153f;\">Biotechnological and winemaking strategies for prevention.<\/span><\/h2><p>Quantifying the level of risk using L7S enables the winemaker to establish targeted stabilisation protocols based on synergistic interventions.<\/p><h3>1. Using tannins<\/h3><p>Some of these have a lower oxidation potential than methionine (donating electrons more readily) and stabilise any mercaptans that may already have formed by creating stable chemical bonds. These formulations find technical application in this context <a href=\"https:\/\/www.ever.it\/prodotti\/evertann-blanche-cru\/\"><strong>EVERTANN BLANCHE CRU<\/strong><\/a>, <a href=\"https:\/\/www.ever.it\/prodotti\/evertann-fruity-cru\/\"><strong>EVERTANN FRUITY CRU<\/strong><\/a><strong>, <\/strong><a href=\"https:\/\/www.ever.it\/prodotti\/bluetann-allegro\/\"><strong>BLUETANN ALLEGRO<\/strong><\/a> e <a href=\"https:\/\/www.ever.it\/prodotti\/bluetann-vivace\/\"><strong>BLUETANN VIVACE<\/strong><\/a>.<\/p><h3>2. Antioxidant and selective adsorbent treatments<\/h3><ul><li><strong>Reduction of the sensitive fraction<\/strong>: the use of <strong>oenological activated carbon<\/strong> reduces the concentration of riboflavin by up to 70 per cent. This process requires careful dosing to preserve the aromatic fraction of the matrix.<\/li><li><strong>Selective clarification:<\/strong> to ensure more targeted interventions that preserve the wine\u2019s structure, complex adjuvants such as <a href=\"https:\/\/www.ever.it\/prodotti\/everclar-gamma\/\"><strong>EVERCLAR GAMMA<\/strong><\/a> o <a href=\"https:\/\/www.ever.it\/prodotti\/cyto-clar\/\"><strong>CYTOCLAR<\/strong><\/a>.<\/li><li><strong>Management of redox potential<\/strong>: maintaining adequate levels of <strong>sulphur dioxide<\/strong> (approximately <strong>50 mg\/L<\/strong>) is essential to stabilise unstable intermediates such as methanal, thereby preventing their subsequent conversion into volatile, malodorous molecules.<\/li><\/ul><h3>3. Packaging validation<\/h3><p>The objective data obtained from the L7S test guide the choice of the optimal container. For wines that are more sensitive to the taste of light, <strong>amber glass<\/strong> must be used, as it is capable of blocking almost all critical wavelengths. Conversely, a stable result from the L7S test allows for the use of clear or green glass for packaging, supported by rigorous scientific validation.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-d2ef28a elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"d2ef28a\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-098fd22\" data-id=\"098fd22\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-2ea6496 elementor-widget elementor-widget-image\" data-id=\"2ea6496\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"607\" height=\"244\" src=\"https:\/\/www.ever.it\/wp-content\/uploads\/Packaging.jpg\" class=\"attachment-medium_large size-medium_large wp-image-9671\" alt=\"\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c88711a elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"c88711a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-381eb8e elementor-widget elementor-widget-text-editor\" data-id=\"381eb8e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2><span style=\"color: #a8153f;\">Conclusions.<\/span><span style=\"color: #a8153f;\"><br \/><\/span><\/h2><p>The use of the Light Seven Stress system enables the risk of light-induced off-flavours to be managed using an objective and predictive approach. Thanks to a rapid test that can be easily integrated into laboratory procedures, the oenologist can assess the photochemical stability of the wine in advance, verify the effectiveness of the treatments applied and support decisions regarding ageing and packaging choices with objective data. This system helps to reduce the risk of post-bottling defects and preserve the wine\u2019s sensory profile over time.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e082426 elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"e082426\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t<div class=\"elementor-element elementor-element-03f696b e-flex e-con-boxed e-con e-parent\" data-id=\"03f696b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Preserving the sensory profile of wine over time is one of the most complex challenges facing contemporary oenology. This requirement must now contend with the growing use of clear glass packaging to highlight the colour characteristics of ros\u00e9 and white wines. However, exposure to light triggers specific degradation processes, leading to the development of a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":9702,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[58],"tags":[],"class_list":["post-9656","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog-en"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.ever.it\/en\/wp-json\/wp\/v2\/posts\/9656","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ever.it\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ever.it\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ever.it\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ever.it\/en\/wp-json\/wp\/v2\/comments?post=9656"}],"version-history":[{"count":11,"href":"https:\/\/www.ever.it\/en\/wp-json\/wp\/v2\/posts\/9656\/revisions"}],"predecessor-version":[{"id":9707,"href":"https:\/\/www.ever.it\/en\/wp-json\/wp\/v2\/posts\/9656\/revisions\/9707"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.ever.it\/en\/wp-json\/wp\/v2\/media\/9702"}],"wp:attachment":[{"href":"https:\/\/www.ever.it\/en\/wp-json\/wp\/v2\/media?parent=9656"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ever.it\/en\/wp-json\/wp\/v2\/categories?post=9656"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ever.it\/en\/wp-json\/wp\/v2\/tags?post=9656"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}