{"id":3027,"date":"2026-10-03T16:09:26","date_gmt":"2026-10-03T16:09:26","guid":{"rendered":"https:\/\/nhdbio.com\/?p=3027"},"modified":"2026-10-11T07:38:55","modified_gmt":"2026-10-11T07:38:55","slug":"pourcentage-final-de-dmso-pour-la-dilution-dune-solution-mere-de-peptide","status":"publish","type":"post","link":"https:\/\/nhdbio.com\/fr\/peptide-stock-dilution-final-dmso-percentage\/","title":{"rendered":"Diluer une solution m\u00e8re de peptide ? Calculez le pourcentage final de DMSO"},"content":{"rendered":"<p>Un petit ajout d'une solution m\u00e8re de peptide concentr\u00e9e ajoute aussi son solvant. Si la solution m\u00e8re contient DMSO, vous devez suivre ce liquide ainsi que le peptide. Les deux calculs r\u00e9pondent \u00e0 des questions diff\u00e9rentes.<\/p>\n<h2>Comptez d'abord le volume de solvant<\/h2>\n<p>Le DMSO est un solvant parfois utilis\u00e9 dans les solutions m\u00e8res de recherche. Pour calculer son pourcentage volumique final, d\u00e9terminez combien de microlitres de DMSO ont \u00e9t\u00e9 ajout\u00e9s, puis divisez par le volume final du m\u00e9lange.<\/p>\n<p>Une solution m\u00e8re pr\u00e9par\u00e9e dans du DMSO pur apporte un microlitre de DMSO par microlitre transf\u00e9r\u00e9. Une solution m\u00e8re contenant 20% DMSO en apporte moins.<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/nhdbio.com\/wp-content\/plugins\/nhd-content-refresh\/teaching-images\/t05\/en\/1.png\" alt=\"Figure 1. A transfer carries both peptide and solvent into the final mixture.\"><figcaption>Figure 1. Le peptide et le solvant voyagent tous deux avec l'aliquote de solution m\u00e8re.<\/figcaption><\/figure>\n<h2>Un exemple avec du DMSO pur<\/h2>\n<p>Assume a 1 mM peptide stock in pure DMSO. Transfer 10 \u00b5L and make the final mixture up to 1,000 \u00b5L. The peptide concentration is 1,000 \u00b5M \u00d7 10 \u00f7 1,000 = 10 \u00b5M.<\/p>\n<p>The DMSO percentage is 10 \u00f7 1,000 \u00d7 100% = 1% by volume. These numbers describe the same mixture, but one describes peptide concentration and the other solvent proportion.<\/p>\n<p class=\"formula\">10 \u00b5L DMSO \u00f7 1,000 \u00b5L final volume \u00d7 100% = 1%<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/nhdbio.com\/wp-content\/plugins\/nhd-content-refresh\/teaching-images\/t05\/en\/2.png\" alt=\"Figure 2. 10 \u00b5L of a stock in 100% DMSO made up to 1,000 \u00b5L gives 1% DMSO by volume.\"><figcaption>Figure 2. In this example, 10 \u00b5L of pure DMSO in a final 1,000 \u00b5L gives 1% DMSO.<\/figcaption><\/figure>\n<h2>Qu'est-ce qui change si la solution m\u00e8re contient 20% DMSO ?<\/h2>\n<p>The same 10 \u00b5L aliquot now carries 10 \u00d7 0.20 = 2 \u00b5L of DMSO. In a final 1,000 \u00b5L mixture, that is 0.2% by volume.<\/p>\n<p>Si plusieurs r\u00e9actifs contiennent DMSO, additionnez toutes leurs contributions de DMSO avant de diviser par le volume final. Ne comptez pas uniquement la solution m\u00e8re de peptide.<\/p>\n<h2>Pourquoi un contr\u00f4le solvant est important<\/h2>\n<p>Si les puits re\u00e7oivent des volumes de solution m\u00e8re diff\u00e9rents, leurs pourcentages de DMSO peuvent aussi diff\u00e9rer. Un contr\u00f4le solvant appropri\u00e9 vous aide \u00e0 \u00e9tudier la contribution du solvant au lieu d'attribuer chaque changement au peptide.<\/p>\n<p>Qu'un pourcentage particulier soit acceptable d\u00e9pend du syst\u00e8me de recherche. Les 1% et 0.2% ici sont des calculs, pas des limites recommand\u00e9es.<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/nhdbio.com\/wp-content\/plugins\/nhd-content-refresh\/teaching-images\/t05\/en\/3.png\" alt=\"Figure 3. Track solvent fraction alongside the peptide concentration at every level.\"><figcaption>Figure 3. Calculez l'exposition au solvant parall\u00e8lement \u00e0 la concentration du peptide.<\/figcaption><\/figure>\n<h2>Essayez une aliquote d'une solution m\u00e8re en solvant mixte<\/h2>\n<div class=\"exercise\"><strong>Transfer 5 \u00b5L of a stock containing 40% DMSO into a final 1,000 \u00b5L. What is the final DMSO percentage?<\/strong><\/p>\n<details>\n<summary>Voir la r\u00e9ponse<\/summary>\n<p>The aliquot contains 5 \u00d7 0.40 = 2 \u00b5L of DMSO. The final percentage is 2 \u00f7 1,000 \u00d7 100% = 0.2% by volume.<\/p>\n<\/details>\n<\/div>\n<p>\u00c9crivez la composition du solvant de la solution m\u00e8re et le volume final \u00e0 c\u00f4t\u00e9 du calcul. Un volume de solution m\u00e8re seul ne suffit pas pour le reproduire.<\/p>\n<h2>V\u00e9rifiez le solvant lors de la planification de travaux en LL-37 ou SS-31<\/h2>\n<p>Pour LL-37 ou SS-31, confirmez quel solvant convient au mat\u00e9riel fourni. Calculez ensuite ce que ce solvant apporte \u00e0 votre m\u00e9lange final pr\u00e9vu. Un nom de produit n'\u00e9tablit pas une m\u00e9thode de pr\u00e9paration universelle en DMSO.<\/p>\n<p><a href=\"https:\/\/nhdbio.com\/fr\/produits\/ll-37\/\">LL-37<\/a> \/ <a href=\"https:\/\/nhdbio.com\/fr\/produits\/ss-31-elamipreotide\/\">SS-31<\/a><\/p>\n<p><a href=\"https:\/\/nhdbio.com\/fr\/citation\/\">Discutez des exigences relatives au mat\u00e9riel et aux documents avec NHD<\/a> \u00b7 <a href=\"https:\/\/nhdbio.com\/fr\/methodes-danalyse\/teneur-en-peptides-par-rapport-a-la-purete\/\">Poursuivre avec le guide analytique<\/a><\/p>\n<footer><strong>Sources et notes explicatives<\/strong><\/p>\n<p>Les chiffres et les courbes sont des exemples p\u00e9dagogiques, et non des r\u00e9sultats d'essais sur des lots de produits. Sources v\u00e9rifi\u00e9es le 11 octobre 2026.<\/p>\n<ul>\n<li><a href=\"https:\/\/www.sigmaaldrich.com\/US\/en\/support\/calculators-and-apps\/solution-dilution-calculator\">Sigma-Aldrich \u00b7 solution dilution calculator<\/a><\/li>\n<li><a href=\"https:\/\/www.sigmaaldrich.com\/content\/dam\/sigma-aldrich\/docs\/Sigma\/General_Information\/peptide_handling_guide.pdf\">Sigma-Aldrich \u00b7 peptide handling guide<\/a><\/li>\n<\/ul>\n<p>R\u00e9daction et r\u00e9vision des sources assist\u00e9es par IA. Les mat\u00e9riaux du catalogue sont destin\u00e9s \u00e0 la recherche, au d\u00e9veloppement et \u00e0 la fabrication, et non \u00e0 un usage humain ou v\u00e9t\u00e9rinaire.<\/p>\n<\/footer>","protected":false},"excerpt":{"rendered":"<p>Suivez la quantit\u00e9 de DMSO qui entre dans le m\u00e9lange final lorsque vous diluez une solution m\u00e8re de peptide.<\/p>","protected":false},"author":1,"featured_media":3057,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"pim_family_ids":"","pim_article_type":"Peptide buying and basics","pim_evidence_level":"Technical references and clearly labeled examples","pim_reviewer":"AI-assisted source and editorial check","pim_reviewed_date":"2026-10-11","pim_editorial_note":"Reference data and teaching examples are separated from NHD lot results; product specifications and availability require confirmation.","pim_review_status":"reviewed","pim_review_reason":"Teaching examples, arithmetic, source links and plain language checked; product enquiries linked.","pim_creation_method":"AI-assisted drafting, source checks, translation and generated comic illustration. This is not independent peer review or supplied-lot verification.","pim_sources":"[{\"title\":\"Thermo Fisher: handling and storage instructions for standard peptides\",\"note\":\"Thermo Fisher: handling and storage instructions for standard peptides. Accessed 2026-10-03.\",\"url\":\"https:\/\/documents.thermofisher.com\/TFS-Assets\/BID\/Reference-Materials\/handling-storage-instruction-standard-peptides.pdf\"},{\"title\":\"Teaching reference \u2014 www.sigmaaldrich.com \u2014 solution-dilution-calculator\",\"note\":\"\",\"url\":\"https:\/\/www.sigmaaldrich.com\/US\/en\/support\/calculators-and-apps\/solution-dilution-calculator\"},{\"title\":\"Teaching reference \u2014 www.sigmaaldrich.com \u2014 peptide_handling_guide.pdf\",\"note\":\"\",\"url\":\"https:\/\/www.sigmaaldrich.com\/content\/dam\/sigma-aldrich\/docs\/Sigma\/General_Information\/peptide_handling_guide.pdf\"}]","footnotes":""},"categories":[20],"tags":[],"class_list":["post-3027","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>Diluting a Peptide Stock? 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