{"id":3104,"date":"2026-10-04T13:31:25","date_gmt":"2026-10-04T13:31:25","guid":{"rendered":"https:\/\/nhdbio.com\/?p=3104"},"modified":"2026-10-04T15:11:42","modified_gmt":"2026-10-04T15:11:42","slug":"diferencia-de-masa-de-dos-hidrogenos-en-el-enlace-disulfuro-del-peptido","status":"publish","type":"post","link":"https:\/\/nhdbio.com\/es\/peptide-disulfide-bond-two-hydrogen-mass-difference\/","title":{"rendered":"Un enlace disulfuro cambia la masa del p\u00e9ptido en aproximadamente 2 Da. \u00bfPor qu\u00e9?"},"content":{"rendered":"<p>Dos versiones de un p\u00e9ptido pueden tener la misma secuencia de amino\u00e1cidos pero masas ligeramente diferentes porque se ha formado un enlace dentro de la mol\u00e9cula. Un enlace disulfuro es un ejemplo: bajo un modelo de oxidaci\u00f3n simple, formar un enlace elimina dos \u00e1tomos de hidr\u00f3geno.<\/p>\n<h2>\u00bfQu\u00e9 ocurre cuando se forma el enlace?<\/h2>\n<p>Dos cadenas laterales de ciste\u00edna pueden unirse a trav\u00e9s de sus \u00e1tomos de azufre. En comparaci\u00f3n con los tioles reducidos correspondientes, el disulfuro resultante contiene dos \u00e1tomos de hidr\u00f3geno menos. Esta explicaci\u00f3n asume que se forma un enlace especificado sin otros cambios qu\u00edmicos; las muestras reales pueden contener mezclas o modificaciones adicionales.<\/p>\n<h2>La diferencia calculada es de aproximadamente 2.016 Da<\/h2>\n<p>NIST gives the mass of a hydrogen-1 atom as 1.00782503223 Da. Removing two gives a calculated neutral monoisotopic mass change of \u22122.01565006446 Da. In a teaching example, a reduced peptide with neutral monoisotopic mass 2000.00000 Da would become approximately 1997.98435 Da after one such bond forms. These are illustrative numbers, not a measured batch.<\/p>\n<h2>Los espectros brutos pueden mostrar una diferencia menor<\/h2>\n<p>Si ambos iones tienen carga +2, la diferencia de m\/z correspondiente es aproximadamente 1.007825. Es la mitad de la diferencia de masa neutra. Por lo tanto, comparar directamente una masa neutra calculada con un pico de ion bruto sin asignar puede crear confusi\u00f3n incluso cuando la qu\u00edmica se entiende.<\/p>\n<h2>La masa no prueba la disposici\u00f3n de los enlaces<\/h2>\n<p>A mass consistent with one disulfide does not, by itself, identify which cysteines are connected when several are present. Bachem\u2019s FAQ also distinguishes cysteine residues from a specifically requested disulfide arrangement. For an order, provide the intended cysteine pairing, not only the letters C in the sequence. Ask what evidence supports that arrangement, and whether a reduced comparison is needed for your particular investigation.<\/p>\n<h2>Siguiente paso con NHD<\/h2>\n<p>Empiece por el <a href=\"https:\/\/nhdbio.com\/es\/servicios\/sintesis-de-peptidos-a-medida\/\">Proyectos de p\u00e9ptidos con disulfuro<\/a>. Para un presupuesto, <a href=\"https:\/\/nhdbio.com\/es\/cita\/\">env\u00ede a NHD su secuencia o nombre del producto, la cantidad y los documentos requeridos<\/a>. Confirme la forma exacta, la viabilidad, los an\u00e1lisis disponibles y las condiciones de entrega antes de hacer el pedido.<\/p>\n<h2>Fuentes<\/h2>\n<ul>\n<li><a href=\"https:\/\/pml.nist.gov\/cgi-bin\/Compositions\/stand_alone.pl?ele=H\">NIST: masas isot\u00f3picas de hidr\u00f3geno<\/a><\/li>\n<li><a href=\"https:\/\/www.bachem.com\/knowledge-center\/faq-frequently-asked-questions\/\">Bachem: FAQ de especificaci\u00f3n de p\u00e9ptidos<\/a><\/li>\n<\/ul>\n<p>Las referencias p\u00fablicas explican el tema; no son evidencia de lote de NHD. Los materiales de investigaci\u00f3n son para investigaci\u00f3n, desarrollo y fabricaci\u00f3n en laboratorio, no para uso humano o veterinario.<\/p>","protected":false},"excerpt":{"rendered":"<p>Dos versiones de un p\u00e9ptido pueden tener la misma secuencia de amino\u00e1cidos pero masas ligeramente diferentes porque se ha formado un enlace dentro de la mol\u00e9cula. Un enlace disulfuro es un ejemplo: bajo un modelo de oxidaci\u00f3n simple, formar un enlace elimina dos \u00e1tomos de hidr\u00f3geno.<\/p>","protected":false},"author":1,"featured_media":3112,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"pim_family_ids":"354","pim_article_type":"Peptide buying and basics","pim_evidence_level":"Technical references and labeled calculations","pim_reviewer":"Codex AI editorial","pim_reviewed_date":"2026-10-04","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":"Source, arithmetic, identity and search-intent checks. No independent human technical review recorded.","pim_creation_method":"AI-assisted writing, source checks and illustrated cover.","pim_sources":"[{\"title\":\"NIST: hydrogen isotopic masses\",\"url\":\"https:\/\/pml.nist.gov\/cgi-bin\/Compositions\/stand_alone.pl?ele=H\",\"note\":\"Public reference, not NHD batch evidence.\"},{\"title\":\"Bachem: peptide specification FAQ\",\"url\":\"https:\/\/www.bachem.com\/knowledge-center\/faq-frequently-asked-questions\/\",\"note\":\"Public reference, not NHD batch evidence.\"}]","footnotes":""},"categories":[20],"tags":[],"class_list":["post-3104","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>A disulfide bond changes peptide mass by about 2 Da. 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