{"id":2888,"date":"2026-08-22T15:46:43","date_gmt":"2026-08-22T14:46:43","guid":{"rendered":"https:\/\/seamlessbio.de\/?page_id=2888"},"modified":"2026-08-23T01:01:16","modified_gmt":"2026-08-23T00:01:16","slug":"what-is-heat-inactivated-fbs","status":"publish","type":"page","link":"https:\/\/seamlessbio.de\/de\/what-is-heat-inactivated-fbs\/","title":{"rendered":"What is Heat Inactivated FBS"},"content":{"rendered":"<div data-elementor-type=\"wp-page\" data-elementor-id=\"2888\" class=\"elementor elementor-2888\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6e4e661 e-con e-atomic-element e-flexbox-base e-ff0a9d1\" data-id=\"6e4e661\" data-element_type=\"e-flexbox\" data-e-type=\"e-flexbox\" data-interaction-id=\"6e4e661\">\n    \t\t<div class=\"elementor-element elementor-element-fee1b0e elementor-widget elementor-widget-html\" data-id=\"fee1b0e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<!-- \nWORDPRESS PAGE \u2014 PASTE INTO GUTENBERG \"BENUTZERDEFINIERTES HTML\" BLOCK\nYoast SEO:\n  Slug: what-is-heat-inactivated-fbs\n  SEO Title: What is Heat Inactivated FBS? \u2014 Definition & When to Use It | SeamlessBio\n  Meta Description: What is heat inactivated FBS, how is it made, what does heat inactivation remove, and when do you need it? Complete definition from SeamlessBio.\n  Focus Keyword: what is heat inactivated FBS\n  Meta Robots: index, follow\n  Page Type: Article\n-->\n\n<div style=\"background:#e9fbfa;border-left:4px solid #18b7b2;border-radius:0 8px 8px 0;padding:20px 24px;margin-bottom:32px;\">\n<p style=\"font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:1px;color:#139b97;margin-bottom:8px;\">Quick Definition<\/p>\n<p style=\"font-size:16px;margin:0;\"><strong>What is Heat Inactivated FBS?:<\/strong> Heat inactivated FBS (HI-FBS) is fetal bovine serum that has been heated to 56\u00b0C for 30 minutes to destroy complement proteins. It is used in cell culture applications where active complement activity would lyse cells or interfere with assay results.<\/p>\n<\/div>\n\n<h2>What does heat inactivation remove?<\/h2>\n<p>Heat inactivation specifically destroys the complement system \u2014 a cascade of ~30 proteins in serum that collectively lyse foreign cells via the membrane attack complex (MAC). In cell culture, bovine complement can non-specifically lyse human cells (particularly lymphocytes and other immune cells) or interfere with virus neutralisation assays where complement-dependent neutralisation would add to antibody-dependent neutralisation.<\/p>\n\n<h2>When is HI-FBS needed?<\/h2>\n<ul>\n  <li><strong>Embryo culture (IVF):<\/strong> HI-FBS at 5\u201310% is standard for bovine, equine and porcine embryo culture \u2014 complement activity can damage blastomeres<\/li>\n  <li><strong>PBMC and immune cell assays:<\/strong> Human lymphocytes are sensitive to bovine complement lysis \u2014 use HI-FBS or switch to human AB serum<\/li>\n  <li><strong>Virus neutralisation assays:<\/strong> Prevents complement-dependent neutralisation from confounding antibody-mediated neutralisation<\/li>\n  <li><strong>Mycoplasma-free culture:<\/strong> Heat inactivation does NOT kill mycoplasma \u2014 use PCR-tested FBS instead<\/li>\n<\/ul>\n\n<h2>When is HI-FBS NOT needed?<\/h2>\n<p>For routine mammalian cell line culture (HeLa, A549, CHO, HEK293, MCF-7), heat inactivation is unnecessary and slightly reduces growth-promoting activity. Standard FBS is preferred for general cell culture.<\/p>\n\n<h2>Key Facts<\/h2>\n<ul>\n<li>Heat inactivation is performed at exactly 56\u00b0C for 30 minutes \u2014 higher temperatures or longer times denature albumin and growth factors, reducing biological activity<\/li>\n<li>The primary target is complement proteins (C1q, C3, C4, C5) \u2014 the classical complement cascade is heat-labile and inactivated at 56\u00b0C<\/li>\n<li>Heat inactivation does NOT remove: endotoxin, IgG, mycoplasma, viruses, growth factors (minor reduction), or albumin<\/li>\n<li>HI-FBS is standard for: embryo culture (bovine, equine, porcine IVF), PBMC assays, virus neutralisation assays, and any application where complement-mediated lysis of target cells would confound results<\/li>\n<li>Heat inactivation slightly reduces growth-promoting activity \u2014 some cell lines grow slower in HI-FBS vs standard FBS<\/li>\n<li>Not required for most routine cell culture \u2014 only use when complement activity is a documented problem for your specific assay<\/li>\n<\/ul>\n\n<h2>Further Reading<\/h2>\n<ul>\n<li><a href=\"https:\/\/seamlessbio.de\/de\/what-is-fbs\/\">What is FBS?<\/a><\/li>\n<li><a href=\"https:\/\/seamlessbio.de\/de\/fortpflanzung-bei-tieren\/\">Animal Reproduction & IVF Serum Guide<\/a><\/li>\n<li><a href=\"https:\/\/seamlessbio.de\/de\/fotales-rinderserum\/\">FBS Portfolio \u2014 All Grades<\/a><\/li>\n<\/ul>\n\n<div style=\"background:#f4f6f7;border-radius:12px;padding:32px;text-align:center;margin-top:40px;\">\n<p style=\"font-size:18px;font-weight:700;color:#1a2e35;margin-bottom:12px;\">FBS Heat Inactivated \u2014 Available from SeamlessBio<\/p>\n<p style=\"color:#6b7f82;margin-bottom:20px;\">Request a free sample or quote within 48 hours.<\/p>\n<a href=\"https:\/\/seamlessbio.de\/de\/fbs-hitzeinaktiviert\/\" style=\"background:#18b7b2;color:#fff;padding:12px 28px;border-radius:50px;font-size:13px;font-weight:700;text-decoration:none;\">View Product \u2192<\/a>\n&nbsp;&nbsp;\n<a href=\"https:\/\/seamlessbio.de\/de\/kontakt\/\" style=\"border:2px solid #18b7b2;color:#139b97;padding:10px 28px;border-radius:50px;font-size:13px;font-weight:700;text-decoration:none;\">Muster anfordern<\/a>\n<\/div>\n\n<p style=\"font-size:13px;color:#6b7f82;margin-top:32px;border-top:1px solid #d8e8e7;padding-top:16px;\">\n<em>SeamlessBio GmbH \u00b7 Passau, Germany \u00b7 <a href=\"mailto:info@seamlessbio.de\">info@seamlessbio.de<\/a> \u00b7 +49 851 37932226<\/em>\n<\/p>\t\t\t\t<\/div>\n\t\t\n<\/div>\n\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Quick Definition What is Heat Inactivated FBS?: Heat inactivated FBS (HI-FBS) is fetal bovine serum that has been heated to 56\u00b0C for 30 minutes to destroy complement proteins. It is [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_eb_attr":"","footnotes":""},"class_list":["post-2888","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What is Heat Inactivated FBS? \u2014 Definition &amp; When to Use It<\/title>\n<meta name=\"description\" content=\"What is heat inactivated FBS, how is it made, what does heat inactivation remove, and when do you need it? 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