{"id":2616,"date":"2026-09-23T12:06:37","date_gmt":"2026-09-23T12:06:37","guid":{"rendered":"https:\/\/nhdbio.com\/?p=2616"},"modified":"2026-09-23T12:06:37","modified_gmt":"2026-09-23T12:06:37","slug":"artefact-lie-a-la-preparation-dechantillons-resultant-de-loxydation-de-la-methionine-dans-les-peptides","status":"publish","type":"post","link":"https:\/\/nhdbio.com\/fr\/peptide-methionine-oxidation-sample-preparation-artifact\/","title":{"rendered":"Oxydation de la m\u00e9thionine en spectrom\u00e9trie de masse des peptides\u00a0: quand est-elle survenue\u00a0?"},"content":{"rendered":"

A mass shift consistent with methionine oxidation shows an oxidized species was detected. It does not, by itself, show that oxidation existed in the original sample. Peptides may oxidize during preparation or mass-spectrometric analysis. The key quality question is when the chemical state was captured<\/strong> relative to handling and measurement.<\/p>\n

Controlled oxidation mixtures, not a universal correction factor<\/h2>\n

A 2024 method paper introduced \u201cMethionine Oxidation by Blocking with Alkylation,\u201d or MObBa, to label unoxidized methionine with iodoacetamide before later analytical steps. The investigators made a fully oxidized and a reduced reference state for the synthetic peptide MASLIKKLAVDR<\/strong>, then mixed these states to nominal 0%, 25%, 50%, 75% and 100% oxidized<\/strong> samples. Figure 3 reports measured fractional oxidation across those five prepared levels, with error bars from two technical replicates<\/strong>. The authors also repeated the design in E. coli<\/em> tryptic peptide mixtures. [1, Results, Figures 3\u20134]<\/p>\n\n\n\n\n\n\n\n
Experimental input<\/th>\nPurpose<\/th>\nInterpretive limit<\/th>\n<\/tr>\n<\/thead>\n
0, 25, 50, 75, 100% nominal oxidized synthetic-peptide mixtures<\/td>\nCheck whether a method tracks a known oxidation series<\/td>\nNominal mixing fractions are not naturally occurring oxidation rates.<\/td>\n<\/tr>\n
Two technical replicates in Figure 3<\/td>\nShow method repeatability for the synthetic-peptide proof of concept<\/td>\nNot a multi-laboratory validation.<\/td>\n<\/tr>\n
E. coli<\/em> tryptic digest mixtures<\/td>\nTest behavior in a complex peptide mixture<\/td>\nNot a mammalian or product-lot matrix.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

The method’s central logic is to quantify a stable derivative of unoxidized<\/strong> methionine, so later conversion to the oxidized form is less likely to be miscounted as oxidation already present at the blocking step. The paper reports a strong relationship between nominal and measured fractions in its experiments, but it does not supply a universal correction for every sequence, reagent or instrument. Iodoacetamide chemistry, alkylation efficiency and possible competing reactions need local validation before use. [1]<\/p>\n

The authors report a material limitation: the alkylation reaction took three days at 37 \u00b0C<\/strong> in their setup. They therefore used degassed samples, nitrogen and fully reduced controls to limit oxidation while the blocking reaction proceeded. \u201cEarly blocking\u201d does not<\/strong> mean instantaneous fixation of the original state, and laboratories should not adopt the technique without checking this exposure interval for their own peptide. [1, Discussion]<\/p>\n

A workflow for an oxidation claim<\/h2>\n

Record sample collection, storage, extraction, digestion and injection times. Add a control peptide or material at a defined early step, and include an independently prepared process blank. If an oxidized fraction rises with longer preparation while the original material is held constant, the preparation contributes to the observation. Confirm site assignment by suitable MS\/MS evidence and account for retention and ionization differences between oxidized and unoxidized species; raw peak-area ratios may be biased. Compare a deliberately stressed positive control with a fresh control, but do not interpret forced oxidation as proof of a product’s ordinary stability.<\/p>\n

The storage-versus-shipping evidence guide<\/a> explains why a stability claim needs material- and condition-specific data. This article addresses the preceding measurement problem: whether the observed oxidation was already present before analysis. Neither paper validates an NHD lot or supports a blanket storage claim.<\/p>\n

An independent electrospray experiment with A\u03b2(1\u201340) found a +16 Da methionine-associated species whose apparent abundance depended strongly on emitter condition; comparison with HPLC indicated much of the signal in one spray mode was generated during analysis. That is a different peptide and instrument, but it demonstrates why a source-induced artifact cannot be ruled out by correct MS\/MS localization alone. [2]<\/p>\n

Decision checks for an oxidation report<\/h3>\n

Separate preparation time<\/strong> from instrument time<\/strong>. Compare a freshly prepared control with a delayed one, monitor an appropriate oxidation-sensitive control across the injection sequence, and record source settings\/emitter condition. Use a chemical or isotopic strategy only after validating its own reaction time and recovery. Report modified and unmodified species with retention and ionization caveats.<\/p>\n

Primary source and claim trail<\/h2>\n
    \n
  1. Methionine Alkylation as an Approach to Quantify Methionine Oxidation Using Mass Spectrometry<\/em><\/a>. Journal of the American Society for Mass Spectrometry<\/em>. 2024. DOI 10.1021\/jasms.3c00337<\/a>, PMID 38324783. Locations:<\/strong> Abstract (method scope); Results \u2192 \u201cMObBa Accurately Measures Protein Oxidation Levels,\u201d Figures 3\u20134 (peptide sequence, five nominal mixture fractions and two technical replicates); Discussion (preparation and ionization artifact boundary). Primary full text checked.<\/li>\n
  2. Oxidation Artifacts in the Electrospray Mass Spectrometry of A\u03b2 Peptide<\/em><\/a>. Analytical Chemistry<\/em>. DOI 10.1021\/ac061743r<\/a>. Location:<\/strong> Results and Discussion, Figure 1 and Conclusions (source\/emitter-dependent apparent oxidation, HPLC comparison). Independent instrument-artifact example; its magnitude is not transferred to the MObBa study.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

    A mass shift consistent with methionine oxidation shows an oxidized species was detected. It does not, by itself, show that oxidation existed in the original sample. Peptides may oxidize during preparation or mass-spectrometric analysis. The key quality question is when the chemical state was captured relative to handling and measurement. Controlled oxidation mixtures, not a […]<\/p>\n","protected":false},"author":1,"featured_media":2615,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"pim_family_ids":"","pim_article_type":"","pim_evidence_level":"","pim_reviewer":"Codex AI-assisted editorial review","pim_reviewed_date":"2026-09-23T19:26:53+08:00","pim_editorial_note":"","pim_review_status":"reviewed","pim_review_reason":"English source and numeric audit, independent seven-language and 135 numeric-exception AI reviews, 70\/70 authenticated localized previews with 2,607\/2,607 body nodes visible, generated-image provenance and visual review, internal-link and private-draft dedup checks completed. Author is existing NHD Technical Team WP user #1. Prepublication SEO fields and expected slug checked; verify public canonical, hreflang, schema, robots and sitemap immediately after this post publishes, and conditionally roll back on failure. Backup is listed in All-in-One WP Migration; full restore was not rehearsed. No human or native-language review was performed.","pim_creation_method":"AI-assisted editorial draft; independent Codex source, image and seven-language review; human professional review not claimed","pim_sources":"[{\"title\":\"Methionine Alkylation as an Approach to Quantify Methionine Oxidation Using Mass Spectrometry\",\"url\":\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC10921467\/\",\"note\":\"Source 1. Abstract (method scope); Results \u2192 \u201cMObBa Accurately Measures Protein Oxidation Levels,\u201d Figures 3\u20134 (peptide sequence, five nominal mixture fractions and two technical replicates); Discussion (preparation and ionization\"},{\"title\":\"Oxidation Artifacts in the Electrospray Mass Spectrometry of A\u03b2 Peptide\",\"url\":\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC2597585\/\",\"note\":\"Source 2. Results and Discussion, Figure 1 and Conclusions (source\/emitter-dependent apparent oxidation, HPLC comparison). Independent instrument-artifact example; its magnitude is not transferred to the MObBa study.\"}]","footnotes":""},"categories":[1],"tags":[],"class_list":["post-2616","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"\nMethionine Oxidation in Peptide MS: Is the Signal an Artifact?<\/title>\n<meta name=\"description\" content=\"A controlled peptide and E. coli proteome study used 0\u2013100% oxidation mixtures to test how analytical handling can distort methionine-oxidation measurements.\" \/>\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\/fr\/artefact-lie-a-la-preparation-dechantillons-resultant-de-loxydation-de-la-methionine-dans-les-peptides\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Methionine Oxidation in Peptide MS: When Did It Happen?\" \/>\n<meta property=\"og:description\" content=\"A controlled peptide and E. coli proteome study used 0\u2013100% oxidation mixtures to test how analytical handling can distort methionine-oxidation measurements.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/nhdbio.com\/fr\/artefact-lie-a-la-preparation-dechantillons-resultant-de-loxydation-de-la-methionine-dans-les-peptides\/\" \/>\n<meta property=\"og:site_name\" content=\"NHD\" \/>\n<meta property=\"article:published_time\" content=\"2026-09-23T12:06:37+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/nhdbio.com\/wp-content\/uploads\/2026\/09\/featured-7.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1672\" \/>\n\t<meta property=\"og:image:height\" content=\"941\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\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=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"NHD Technical Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/nhdbio.com\\\/peptide-methionine-oxidation-sample-preparation-artifact\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/nhdbio.com\\\/peptide-methionine-oxidation-sample-preparation-artifact\\\/\"},\"author\":{\"name\":\"NHD Technical Team\",\"@id\":\"https:\\\/\\\/nhdbio.com\\\/#\\\/schema\\\/person\\\/0ffb0dec7fda0f720073fc468fac6fc1\"},\"headline\":\"Methionine Oxidation in Peptide MS: When Did It Happen?\",\"datePublished\":\"2026-09-23T12:06:37+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/nhdbio.com\\\/peptide-methionine-oxidation-sample-preparation-artifact\\\/\"},\"wordCount\":714,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/nhdbio.com\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/nhdbio.com\\\/peptide-methionine-oxidation-sample-preparation-artifact\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/nhdbio.com\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/featured-7.png\",\"articleSection\":[\"Uncategorized\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/nhdbio.com\\\/peptide-methionine-oxidation-sample-preparation-artifact\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/nhdbio.com\\\/peptide-methionine-oxidation-sample-preparation-artifact\\\/\",\"url\":\"https:\\\/\\\/nhdbio.com\\\/peptide-methionine-oxidation-sample-preparation-artifact\\\/\",\"name\":\"Methionine Oxidation in Peptide MS: Is the Signal an Artifact?\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/nhdbio.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/nhdbio.com\\\/peptide-methionine-oxidation-sample-preparation-artifact\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/nhdbio.com\\\/peptide-methionine-oxidation-sample-preparation-artifact\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/nhdbio.com\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/featured-7.png\",\"datePublished\":\"2026-09-23T12:06:37+00:00\",\"description\":\"A controlled peptide and E. coli proteome study used 0\u2013100% oxidation mixtures to test how analytical handling can distort methionine-oxidation measurements.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/nhdbio.com\\\/peptide-methionine-oxidation-sample-preparation-artifact\\\/#breadcrumb\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/nhdbio.com\\\/peptide-methionine-oxidation-sample-preparation-artifact\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\\\/\\\/nhdbio.com\\\/peptide-methionine-oxidation-sample-preparation-artifact\\\/#primaryimage\",\"url\":\"https:\\\/\\\/nhdbio.com\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/featured-7.png\",\"contentUrl\":\"https:\\\/\\\/nhdbio.com\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/featured-7.png\",\"width\":1672,\"height\":941,\"caption\":\"Conceptual illustration of a peptide sample exposed to oxygen during preparation. Not experimental data.\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/nhdbio.com\\\/peptide-methionine-oxidation-sample-preparation-artifact\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/nhdbio.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Methionine Oxidation in Peptide MS: When Did It Happen?\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/nhdbio.com\\\/#website\",\"url\":\"https:\\\/\\\/nhdbio.com\\\/\",\"name\":\"NHD\",\"description\":\"Peptide Raw Materials and Custom Peptide Synthesis\",\"publisher\":{\"@id\":\"https:\\\/\\\/nhdbio.com\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/nhdbio.com\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"fr-FR\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/nhdbio.com\\\/#organization\",\"name\":\"NHD\",\"url\":\"https:\\\/\\\/nhdbio.com\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\\\/\\\/nhdbio.com\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/nhdbio.com\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/codex-clipboard-354c928e-4b5b-482d-9261-02023d4c9680.png\",\"contentUrl\":\"https:\\\/\\\/nhdbio.com\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/codex-clipboard-354c928e-4b5b-482d-9261-02023d4c9680.png\",\"width\":2172,\"height\":724,\"caption\":\"NHD\"},\"image\":{\"@id\":\"https:\\\/\\\/nhdbio.com\\\/#\\\/schema\\\/logo\\\/image\\\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/nhdbio.com\\\/#\\\/schema\\\/person\\\/0ffb0dec7fda0f720073fc468fac6fc1\",\"name\":\"NHD Technical Team\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/8445618b3e2834fa0c7ae1a03a371ed002e9bf8d2cc1cd989dc4a71bb2b66110?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/8445618b3e2834fa0c7ae1a03a371ed002e9bf8d2cc1cd989dc4a71bb2b66110?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/8445618b3e2834fa0c7ae1a03a371ed002e9bf8d2cc1cd989dc4a71bb2b66110?s=96&d=mm&r=g\",\"caption\":\"NHD Technical Team\"},\"description\":\"NHD Technical Team maintains research-use catalog documentation and evidence summaries. Reviewed articles link to peer-reviewed papers, trial registries and regulatory records, retain null findings and study limitations, and distinguish published interventions from catalog materials. AI-assisted drafting may be used for structure; source links and evidence boundaries remain visible. This work is not independent peer review or medical advice.\",\"sameAs\":[\"https:\\\/\\\/nhdbio.com\"],\"url\":\"https:\\\/\\\/nhdbio.com\\\/fr\\\/author\\\/qianmiao-technical-team\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Oxydation de la m\u00e9thionine en spectrom\u00e9trie de masse des peptides\u00a0: quand est-elle survenue\u00a0?","description":"Des m\u00e9langes contr\u00f4l\u00e9s \u00e0 0\u2013100% d\u2019oxydation montrent comment la pr\u00e9paration peut fausser la mesure de m\u00e9thionine oxyd\u00e9e.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/nhdbio.com\/fr\/artefact-lie-a-la-preparation-dechantillons-resultant-de-loxydation-de-la-methionine-dans-les-peptides\/","og_locale":"fr_FR","og_type":"article","og_title":"Methionine Oxidation in Peptide MS: When Did It Happen?","og_description":"A controlled peptide and E. coli proteome study used 0\u2013100% oxidation mixtures to test how analytical handling can distort methionine-oxidation measurements.","og_url":"https:\/\/nhdbio.com\/fr\/artefact-lie-a-la-preparation-dechantillons-resultant-de-loxydation-de-la-methionine-dans-les-peptides\/","og_site_name":"NHD","article_published_time":"2026-09-23T12:06:37+00:00","og_image":[{"width":1672,"height":941,"url":"http:\/\/nhdbio.com\/wp-content\/uploads\/2026\/09\/featured-7.png","type":"image\/png"}],"author":"NHD Technical Team","twitter_card":"summary_large_image","twitter_description":"Peptide Raw Materials and Custom Peptide Synthesis","twitter_misc":{"\u00c9crit par":"NHD Technical Team","Dur\u00e9e de lecture estim\u00e9e":"4 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/nhdbio.com\/peptide-methionine-oxidation-sample-preparation-artifact\/#article","isPartOf":{"@id":"https:\/\/nhdbio.com\/peptide-methionine-oxidation-sample-preparation-artifact\/"},"author":{"name":"NHD Technical Team","@id":"https:\/\/nhdbio.com\/#\/schema\/person\/0ffb0dec7fda0f720073fc468fac6fc1"},"headline":"Methionine Oxidation in Peptide MS: When Did It Happen?","datePublished":"2026-09-23T12:06:37+00:00","mainEntityOfPage":{"@id":"https:\/\/nhdbio.com\/peptide-methionine-oxidation-sample-preparation-artifact\/"},"wordCount":714,"commentCount":0,"publisher":{"@id":"https:\/\/nhdbio.com\/#organization"},"image":{"@id":"https:\/\/nhdbio.com\/peptide-methionine-oxidation-sample-preparation-artifact\/#primaryimage"},"thumbnailUrl":"https:\/\/nhdbio.com\/wp-content\/uploads\/2026\/09\/featured-7.png","articleSection":["Uncategorized"],"inLanguage":"fr-FR","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/nhdbio.com\/peptide-methionine-oxidation-sample-preparation-artifact\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/nhdbio.com\/peptide-methionine-oxidation-sample-preparation-artifact\/","url":"https:\/\/nhdbio.com\/peptide-methionine-oxidation-sample-preparation-artifact\/","name":"Oxydation de la m\u00e9thionine en spectrom\u00e9trie de masse des peptides\u00a0: quand est-elle survenue\u00a0?","isPartOf":{"@id":"https:\/\/nhdbio.com\/#website"},"primaryImageOfPage":{"@id":"https:\/\/nhdbio.com\/peptide-methionine-oxidation-sample-preparation-artifact\/#primaryimage"},"image":{"@id":"https:\/\/nhdbio.com\/peptide-methionine-oxidation-sample-preparation-artifact\/#primaryimage"},"thumbnailUrl":"https:\/\/nhdbio.com\/wp-content\/uploads\/2026\/09\/featured-7.png","datePublished":"2026-09-23T12:06:37+00:00","description":"Des m\u00e9langes contr\u00f4l\u00e9s \u00e0 0\u2013100% d\u2019oxydation montrent comment la pr\u00e9paration peut fausser la mesure de m\u00e9thionine oxyd\u00e9e.","breadcrumb":{"@id":"https:\/\/nhdbio.com\/peptide-methionine-oxidation-sample-preparation-artifact\/#breadcrumb"},"inLanguage":"fr-FR","potentialAction":[{"@type":"ReadAction","target":["https:\/\/nhdbio.com\/peptide-methionine-oxidation-sample-preparation-artifact\/"]}]},{"@type":"ImageObject","inLanguage":"fr-FR","@id":"https:\/\/nhdbio.com\/peptide-methionine-oxidation-sample-preparation-artifact\/#primaryimage","url":"https:\/\/nhdbio.com\/wp-content\/uploads\/2026\/09\/featured-7.png","contentUrl":"https:\/\/nhdbio.com\/wp-content\/uploads\/2026\/09\/featured-7.png","width":1672,"height":941,"caption":"Conceptual illustration of a peptide sample exposed to oxygen during preparation. Not experimental data."},{"@type":"BreadcrumbList","@id":"https:\/\/nhdbio.com\/peptide-methionine-oxidation-sample-preparation-artifact\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/nhdbio.com\/"},{"@type":"ListItem","position":2,"name":"Methionine Oxidation in Peptide MS: When Did It Happen?"}]},{"@type":"WebSite","@id":"https:\/\/nhdbio.com\/#website","url":"https:\/\/nhdbio.com\/","name":"NHD","description":"Mati\u00e8res premi\u00e8res peptidiques et synth\u00e8se sur mesure","publisher":{"@id":"https:\/\/nhdbio.com\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/nhdbio.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"fr-FR"},{"@type":"Organization","@id":"https:\/\/nhdbio.com\/#organization","name":"NHD","url":"https:\/\/nhdbio.com\/","logo":{"@type":"ImageObject","inLanguage":"fr-FR","@id":"https:\/\/nhdbio.com\/#\/schema\/logo\/image\/","url":"https:\/\/nhdbio.com\/wp-content\/uploads\/2026\/09\/codex-clipboard-354c928e-4b5b-482d-9261-02023d4c9680.png","contentUrl":"https:\/\/nhdbio.com\/wp-content\/uploads\/2026\/09\/codex-clipboard-354c928e-4b5b-482d-9261-02023d4c9680.png","width":2172,"height":724,"caption":"NHD"},"image":{"@id":"https:\/\/nhdbio.com\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/nhdbio.com\/#\/schema\/person\/0ffb0dec7fda0f720073fc468fac6fc1","name":"\u00c9quipe technique NHD","image":{"@type":"ImageObject","inLanguage":"fr-FR","@id":"https:\/\/secure.gravatar.com\/avatar\/8445618b3e2834fa0c7ae1a03a371ed002e9bf8d2cc1cd989dc4a71bb2b66110?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/8445618b3e2834fa0c7ae1a03a371ed002e9bf8d2cc1cd989dc4a71bb2b66110?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/8445618b3e2834fa0c7ae1a03a371ed002e9bf8d2cc1cd989dc4a71bb2b66110?s=96&d=mm&r=g","caption":"NHD Technical Team"},"description":"L'\u00e9quipe technique NHD maintient la documentation du catalogue d'utilisation de la recherche et les r\u00e9sum\u00e9s des preuves. Les articles examin\u00e9s renvoient \u00e0 des articles \u00e9valu\u00e9s par des pairs, \u00e0 des registres d'essais et \u00e0 des dossiers r\u00e9glementaires, conservent les r\u00e9sultats nuls et les limites des \u00e9tudes, et distinguent les interventions publi\u00e9es des documents du catalogue. Le dessin assist\u00e9 par AI peut \u00eatre utilis\u00e9 pour la structure\u00a0; les liens vers les sources et les limites des preuves restent visibles. Ce travail ne constitue pas un examen ind\u00e9pendant par des pairs ni un avis m\u00e9dical.","sameAs":["https:\/\/nhdbio.com"],"url":"https:\/\/nhdbio.com\/fr\/author\/qianmiao-technical-team\/"}]}},"_links":{"self":[{"href":"https:\/\/nhdbio.com\/fr\/wp-json\/wp\/v2\/posts\/2616","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nhdbio.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nhdbio.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nhdbio.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nhdbio.com\/fr\/wp-json\/wp\/v2\/comments?post=2616"}],"version-history":[{"count":1,"href":"https:\/\/nhdbio.com\/fr\/wp-json\/wp\/v2\/posts\/2616\/revisions"}],"predecessor-version":[{"id":2636,"href":"https:\/\/nhdbio.com\/fr\/wp-json\/wp\/v2\/posts\/2616\/revisions\/2636"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nhdbio.com\/fr\/wp-json\/wp\/v2\/media\/2615"}],"wp:attachment":[{"href":"https:\/\/nhdbio.com\/fr\/wp-json\/wp\/v2\/media?parent=2616"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nhdbio.com\/fr\/wp-json\/wp\/v2\/categories?post=2616"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nhdbio.com\/fr\/wp-json\/wp\/v2\/tags?post=2616"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}