{"id":17367,"date":"2025-05-03T00:00:29","date_gmt":"2025-05-03T00:00:29","guid":{"rendered":"https:\/\/fitolympia.com\/?p=17367"},"modified":"2025-05-03T16:47:31","modified_gmt":"2025-05-03T16:47:31","slug":"why-does-cutting-onions-make-our-eyes-tear","status":"publish","type":"post","link":"https:\/\/fitolympia.com\/fr\/why-does-cutting-onions-make-our-eyes-tear\/","title":{"rendered":"Pourquoi couper des oignons nous fait-il pleurer les yeux?"},"content":{"rendered":"

Q. Pourquoi couper des oignons nous fait-il pleurer les yeux?<\/h3>
\"\"<\/figure>

Un. Lorsqu\u2019un oignon est coup\u00e9, certains compos\u00e9s (lacrymateurs) sont lib\u00e9r\u00e9s, provoquant l\u2019irritation des nerfs autour des yeux (glandes lacrymales).<\/strong><\/p>

Ces compos\u00e9s sont constitu\u00e9s de m\u00e9thionine et de cystine qui font partie de la famille des acides amin\u00e9s. (Les prot\u00e9ines sont compos\u00e9es de plusieurs de ces acides amin\u00e9s regroup\u00e9s.)When an onion is sliced or diced, the onion’s cells release these compounds into the air. When this occurs, “enzyme” works to alter the amino acids into lachrymator compounds. This form of sulfuric acid irritates the nerves around the eyes making them tear.<\/p>

Comment pouvons-nous pr\u00e9venir cette r\u00e9action?<\/p>

  1. Use a sharp knife to cut the onion to reduce the amount of damage to the onion cells.<\/li>
  2. Cool the onion in a refrigerator to suppress the scattering of the lachrymator.<\/li>
  3. Soak the onion in water to dissolve the amino acids. (Cutting the onions in half or quarters before soaking them is even more effective.)<\/li>
  4. Wear swimming goggles or ski goggles while cutting the onion.<\/li>
  5. Use a ventilator or fan to blow the allyl sulfide away.<\/li><\/ol>

    Qu\u2019est-ce que le lacrymator?<\/h4>

    L\u2019irritation des glandes lacrymales provoque la s\u00e9cr\u00e9tion de larmes en continu sans \u00eatre influenc\u00e9e par l\u2019intention et l\u2019\u00e9motion de pleurer. Les compos\u00e9s chimiques lib\u00e9r\u00e9s par les oignons sont le sulfure d\u2019allyle et ils existent \u00e9galement dans l\u2019ail et les oignons de printemps.<\/p>

    Qu\u2019est-ce qu\u2019un acide amin\u00e9?<\/h4>

    Un compos\u00e9 organique contenant un groupe amino (-NH2), un groupe acide carboxylique (-COOH), avec plus de 80 groupes secondaires naturels, dont plus de 20 compos\u00e9s pouvant former des prot\u00e9ines.<\/p>

    Qu\u2019est-ce qu\u2019une enzyme?<\/h4>

    Polym\u00e8re \u00e9lev\u00e9 produit par des organismes vivants et fonctionnant comme catalyseur biochimique. Il existe plusieurs types d\u2019enzymes, chacune d\u2019entre elles pr\u00e9sentant une r\u00e9action chimique d\u00e9finie.<\/p>

    Qu\u2019est-ce qu\u2019un catalyseur?<\/h4>

    Substance qui modifie une r\u00e9action chimique sans \u00eatre affect\u00e9e elle-m\u00eame.<\/p> ","protected":false},"excerpt":{"rendered":"

    Q. Pourquoi couper des oignons nous fait-il pleurer les yeux? Un. Lorsqu\u2019un oignon est coup\u00e9, certains compos\u00e9s (lacrymateurs) sont lib\u00e9r\u00e9s, […]<\/p>\n","protected":false},"author":2,"featured_media":17370,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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