{"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":"difference-de-masse-de-deux-hydrogenes-pour-une-liaison-disulfure-peptidique","status":"publish","type":"post","link":"https:\/\/nhdbio.com\/fr\/peptide-disulfide-bond-two-hydrogen-mass-difference\/","title":{"rendered":"Une liaison disulfure modifie la masse du peptide d'environ 2 Da. Pourquoi ?"},"content":{"rendered":"<p>Deux versions d'un peptide peuvent avoir la m\u00eame s\u00e9quence d'acides amin\u00e9s mais des masses l\u00e9g\u00e8rement diff\u00e9rentes parce qu'une liaison s'est form\u00e9e \u00e0 l'int\u00e9rieur de la mol\u00e9cule. Une liaison disulfure en est un exemple : selon un mod\u00e8le d'oxydation simple, la formation d'une liaison retire deux atomes d'hydrog\u00e8ne.<\/p>\n<h2>Que se passe-t-il lorsque la liaison se forme ?<\/h2>\n<p>Deux cha\u00eenes lat\u00e9rales de cyst\u00e9ine peuvent se joindre par leurs atomes de soufre. Compar\u00e9 aux thiols r\u00e9duits correspondants, le disulfure obtenu contient deux atomes d'hydrog\u00e8ne en moins. Cette explication suppose qu'une liaison donn\u00e9e se forme sans autres changements chimiques ; les \u00e9chantillons r\u00e9els peuvent contenir des m\u00e9langes ou des modifications suppl\u00e9mentaires.<\/p>\n<h2>La diff\u00e9rence calcul\u00e9e est d'environ 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>Les spectres bruts peuvent montrer un \u00e9cart plus petit<\/h2>\n<p>Si les deux ions ont une charge +2, l'\u00e9cart m\/z correspondant est approximativement 1.007825. C'est la moiti\u00e9 de la diff\u00e9rence de masse neutre. Comparer directement une masse neutre calcul\u00e9e avec un pic ionique brut non attribu\u00e9 peut donc cr\u00e9er de la confusion m\u00eame lorsque la chimie est comprise.<\/p>\n<h2>La masse ne prouve pas l'arrangement des liaisons<\/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>Prochaine \u00e9tape avec NHD<\/h2>\n<p>Commencez par le <a href=\"https:\/\/nhdbio.com\/fr\/services\/synthese-de-peptides-sur-mesure\/\">Projets de peptides \u00e0 pont disulfure<\/a>. Pour un devis, <a href=\"https:\/\/nhdbio.com\/fr\/citation\/\">envoyez NHD votre s\u00e9quence ou nom de produit, la quantit\u00e9 et les documents requis<\/a>. Confirmez la forme exacte, la faisabilit\u00e9, les tests disponibles et les conditions de livraison avant de commander.<\/p>\n<h2>Sources<\/h2>\n<ul>\n<li><a href=\"https:\/\/pml.nist.gov\/cgi-bin\/Compositions\/stand_alone.pl?ele=H\">NIST : masses isotopiques de l'hydrog\u00e8ne<\/a><\/li>\n<li><a href=\"https:\/\/www.bachem.com\/knowledge-center\/faq-frequently-asked-questions\/\">Bachem : FAQ sur les sp\u00e9cifications des peptides<\/a><\/li>\n<\/ul>\n<p>Les r\u00e9f\u00e9rences publiques expliquent le sujet ; elles ne constituent pas des preuves de lot NHD. Les mat\u00e9riaux de recherche sont destin\u00e9s \u00e0 la recherche, au d\u00e9veloppement et \u00e0 la fabrication en laboratoire, et non \u00e0 un usage humain ou v\u00e9t\u00e9rinaire.<\/p>","protected":false},"excerpt":{"rendered":"<p>Deux versions d'un peptide peuvent avoir la m\u00eame s\u00e9quence d'acides amin\u00e9s mais des masses l\u00e9g\u00e8rement diff\u00e9rentes parce qu'une liaison s'est form\u00e9e \u00e0 l'int\u00e9rieur de la mol\u00e9cule. Une liaison disulfure en est un exemple : selon un mod\u00e8le d'oxydation simple, la formation d'une liaison retire deux atomes d'hydrog\u00e8ne.<\/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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