{"id":3099,"date":"2026-10-04T13:31:01","date_gmt":"2026-10-04T13:31:01","guid":{"rendered":"https:\/\/nhdbio.com\/?p=3099"},"modified":"2026-10-11T07:41:07","modified_gmt":"2026-10-11T07:41:07","slug":"comprobacion-de-masa-de-oxidacion-de-las-dos-metioninas-de-mots-c","status":"publish","type":"post","link":"https:\/\/nhdbio.com\/es\/mots-c-two-methionines-oxidation-mass-check\/","title":{"rendered":"MOTS-c y una se\u00f1al +16 Da: trabaja con un candidato de oxidaci\u00f3n"},"content":{"rendered":"<p>Una se\u00f1al de MOTS-c aparece aproximadamente 16 Da m\u00e1s pesada de lo esperado. La oxidaci\u00f3n es una posibilidad que se debe investigar. Pero para entender esa pista, primero debemos encontrar los amino\u00e1cidos relevantes y verificar si el gr\u00e1fico muestra masa molecular o m\/z.<\/p>\n<h2>Encuentra las dos letras M<\/h2>\n<p>Una secuencia de referencia com\u00fan de MOTS-c es MRWQEMGYIFYPRKLR. M significa metionina. Cuenta desde el principio: los dos residuos M est\u00e1n en las posiciones 1 y 6.<\/p>\n<p>Use the actual supplied sequence and end groups when evaluating a sample. The reference sequence is a starting point, not a replacement for the material\u2019s specification.<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/nhdbio.com\/wp-content\/plugins\/nhd-content-refresh\/teaching-images\/t13\/en\/1.png\" alt=\"Figura 1. La secuencia can\u00f3nica de ense\u00f1anza de MOTS-c tiene metionina en las posiciones 1 y 6.\"><figcaption>Figura 1. Las metioninas en esta referencia de MOTS-c est\u00e1n en las posiciones 1 y 6.<\/figcaption><\/figure>\n<h2>Por qu\u00e9 un ox\u00edgeno da aproximadamente 16 Da<\/h2>\n<p>A\u00f1adir un ox\u00edgeno da un aumento de masa monoisot\u00f3pica de 15.994915 Da en el registro de oxidaci\u00f3n de Unimod. Para dos \u00e1tomos de ox\u00edgeno, el aumento es 31.989830 Da. En conversaci\u00f3n, estos suelen abreviarse como +16 y +32.<\/p>\n<p>Esos n\u00fameros redondeados son pistas \u00fatiles. Una comparaci\u00f3n precisa usa el valor m\u00e1s preciso y la forma molecular correcta.<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/nhdbio.com\/wp-content\/plugins\/nhd-content-refresh\/teaching-images\/t13\/en\/2.png\" alt=\"Figura 2. A\u00f1adir uno o dos \u00e1tomos de ox\u00edgeno desplaza la masa monoisot\u00f3pica neutra en 15.994915 o 31.989830 Da.\"><figcaption>Figura 2. Uno y dos \u00e1tomos de ox\u00edgeno a\u00f1adidos producen aumentos de masa diferentes.<\/figcaption><\/figure>\n<h2>Por qu\u00e9 el espectro puede desplazarse solo 8<\/h2>\n<p>Para iones de doble carga coincidentes, divida el cambio de masa entre dos. Un ox\u00edgeno entonces desplaza m\/z en aproximadamente 7.99746. Dos \u00e1tomos de ox\u00edgeno lo desplazan en aproximadamente 15.99492.<\/p>\n<p>So \u201ca shift of 16\u201d is unclear without saying which axis and charge you mean.<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/nhdbio.com\/wp-content\/plugins\/nhd-content-refresh\/teaching-images\/t13\/en\/3.png\" alt=\"Figura 3. Con carga 2, los desplazamientos candidatos de un ox\u00edgeno y dos ox\u00edgenos pasan a ser aproximadamente 7.9975 y 15.9949 m\/z.\"><figcaption>Figura 3. En iones de doble carga, el cambio de m\/z es la mitad del cambio de masa.<\/figcaption><\/figure>\n<h2>\u00bfPuede la masa total decirle qu\u00e9 M cambi\u00f3?<\/h2>\n<p>Por s\u00ed sola, no. La oxidaci\u00f3n en cualquiera de las metioninas puede dar el mismo aumento de un ox\u00edgeno en la masa completa. Datos de fragmentos adecuados y comparaci\u00f3n cromatogr\u00e1fica pueden ayudar a investigar la ubicaci\u00f3n y las alternativas.<\/p>\n<p>El espectro tampoco puede decirle cu\u00e1ndo ocurri\u00f3 el cambio. Mantenga registros de almacenamiento y manipulaci\u00f3n junto con los datos anal\u00edticos.<\/p>\n<h2>Prueba con una se\u00f1al de tres cargas<\/h2>\n<p>No conviertas la intensidad del pico directamente en un porcentaje en peso de oxidaci\u00f3n. Eso requiere un m\u00e9todo cuantitativo adecuado.<\/p>\n<div class=\"exercise\"><strong>Para un ox\u00edgeno a\u00f1adido en un ion de tres cargas coincidente, \u00bfcu\u00e1l es el desplazamiento aproximado de m\/z?<\/strong><\/p>\n<details>\n<summary>Ver la respuesta<\/summary>\n<p>15.994915 \u00f7 3 \u2248 5.33164. That value alone still does not locate the change.<\/p>\n<\/details>\n<\/div>\n<h2>Qu\u00e9 preguntar sobre una muestra de MOTS-c<\/h2>\n<p>Para MOTS-c, confirma la secuencia real y los grupos terminales, y pregunta qu\u00e9 informaci\u00f3n relacionada con la identidad o la estabilidad est\u00e1 disponible. Esta lecci\u00f3n explica un posible cambio de masa; no indica un nivel de oxidaci\u00f3n de un lote ni una vida \u00fatil.<\/p>\n<p><a href=\"https:\/\/nhdbio.com\/es\/productos\/palabras-c-humano\/\">MOTS-c<\/a><\/p>\n<p><a href=\"https:\/\/nhdbio.com\/es\/cita\/\">Consulte sobre requisitos de material y documentaci\u00f3n con NHD<\/a> \u00b7 <a href=\"https:\/\/nhdbio.com\/es\/metodos-analiticos\/pruebas-de-identidad-de-lc-ms\/\">Contin\u00fae con la gu\u00eda anal\u00edtica<\/a><\/p>\n<footer><strong>Fuentes y notas de ejemplo<\/strong><\/p>\n<p>Los n\u00fameros y las curvas son ejemplos did\u00e1cticos, no resultados de an\u00e1lisis de lotes de producto. Fuentes consultadas el 11 de octubre de 2026.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.unimod.org\/modifications_view.php?editid1=35\">Unimod \u00b7 modification record 35<\/a><\/li>\n<li><a href=\"https:\/\/www.thermofisher.com\/us\/en\/home\/life-science\/protein-biology\/protein-biology-learning-center\/protein-biology-resource-library\/pierce-protein-methods\/overview-mass-spectrometry.html\">Thermo Fisher Scientific \u00b7 mass spectrometry<\/a><\/li>\n<li><a href=\"https:\/\/www.anaspec.com\/assets\/8a540d6b-5e0c-461e-ac6d-33f2d3f1e1f7\/tds-en-as-65587-mots-c.pdf\">AnaSpec \u00b7 MOTS-c reference sequence<\/a><\/li>\n<\/ul>\n<p>Redacci\u00f3n y revisi\u00f3n de fuentes asistidas por IA. Los materiales del cat\u00e1logo son para investigaci\u00f3n, desarrollo y fabricaci\u00f3n, no para uso humano o veterinario.<\/p>\n<\/footer>","protected":false},"excerpt":{"rendered":"<p>Encuentra las dos metioninas de MOTS-c, luego sigue el cambio de masa por un ox\u00edgeno a\u00f1adido.<\/p>","protected":false},"author":1,"featured_media":3973,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"pim_family_ids":"352","pim_article_type":"Peptide buying and basics","pim_evidence_level":"Technical references and labeled calculations","pim_reviewer":"AI-assisted source and editorial check","pim_reviewed_date":"2026-10-11","pim_editorial_note":"Public data and labeled teaching calculations; not NHD batch results. Confirm project and document availability.","pim_review_status":"reviewed","pim_review_reason":"Teaching examples, arithmetic, source links and plain language checked; product enquiries linked.","pim_creation_method":"AI-assisted writing, source checks and illustrated cover.","pim_sources":"[{\"title\":\"Teaching reference \u2014 www.unimod.org \u2014 modifications_view.php\",\"note\":\"\",\"url\":\"https:\/\/www.unimod.org\/modifications_view.php?editid1=35\"},{\"title\":\"Teaching reference \u2014 www.thermofisher.com \u2014 overview-mass-spectrometry.html\",\"note\":\"\",\"url\":\"https:\/\/www.thermofisher.com\/us\/en\/home\/life-science\/protein-biology\/protein-biology-learning-center\/protein-biology-resource-library\/pierce-protein-methods\/overview-mass-spectrometry.html\"},{\"title\":\"Teaching reference \u2014 www.anaspec.com \u2014 tds-en-as-65587-mots-c.pdf\",\"note\":\"\",\"url\":\"https:\/\/www.anaspec.com\/assets\/8a540d6b-5e0c-461e-ac6d-33f2d3f1e1f7\/tds-en-as-65587-mots-c.pdf\"}]","footnotes":""},"categories":[20],"tags":[],"class_list":["post-3099","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-evidence-quality-guides"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.0 (Yoast SEO v28.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>MOTS-c and a +16 Da Signal: Work Through an Oxidation Candidate | NHD<\/title>\n<meta name=\"description\" content=\"Find MOTS-c\u2019s two methionines, then follow the mass change from one added oxygen.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/nhdbio.com\/es\/comprobacion-de-masa-de-oxidacion-de-las-dos-metioninas-de-mots-c\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MOTS-c and a +16 Da Signal: Work Through an Oxidation Candidate\" \/>\n<meta property=\"og:description\" content=\"Find MOTS-c\u2019s two methionines, then follow the mass change from one added oxygen.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/nhdbio.com\/es\/comprobacion-de-masa-de-oxidacion-de-las-dos-metioninas-de-mots-c\/\" \/>\n<meta property=\"og:site_name\" content=\"NHD\" \/>\n<meta property=\"article:published_time\" content=\"2026-10-04T13:31:01+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-10-11T07:41:07+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/nhdbio.com\/wp-content\/uploads\/2026\/10\/nhd-comic-3099.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"800\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"NHD Technical Team\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:description\" content=\"Peptide Raw Materials and Custom Peptide Synthesis\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"NHD Technical Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tiempo de lectura\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/nhdbio.com\\\/mots-c-two-methionines-oxidation-mass-check\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/nhdbio.com\\\/mots-c-two-methionines-oxidation-mass-check\\\/\"},\"author\":{\"name\":\"NHD Technical Team\",\"@id\":\"https:\\\/\\\/nhdbio.com\\\/#\\\/schema\\\/person\\\/0ffb0dec7fda0f720073fc468fac6fc1\"},\"headline\":\"MOTS-c and a +16 Da Signal: Work Through an Oxidation Candidate\",\"datePublished\":\"2026-10-04T13:31:01+00:00\",\"dateModified\":\"2026-10-11T07:41:07+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/nhdbio.com\\\/mots-c-two-methionines-oxidation-mass-check\\\/\"},\"wordCount\":452,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/nhdbio.com\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/nhdbio.com\\\/mots-c-two-methionines-oxidation-mass-check\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/nhdbio.com\\\/wp-content\\\/uploads\\\/2026\\\/10\\\/nhd-comic-3099.jpg\",\"articleSection\":[\"Evidence &amp; 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