{"id":2524,"date":"2025-05-14T12:36:52","date_gmt":"2025-05-14T16:36:52","guid":{"rendered":"https:\/\/lifetein.com\/blog\/?p=2524"},"modified":"2025-05-14T12:36:53","modified_gmt":"2025-05-14T16:36:53","slug":"what-spacers-should-i-use-in-my-peptides","status":"publish","type":"post","link":"https:\/\/www.lifetein.com\/blog\/what-spacers-should-i-use-in-my-peptides\/","title":{"rendered":"What Spacers Should I Use in My Peptides?"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"300\" height=\"185\" src=\"https:\/\/lifetein.com\/blog\/wp-content\/uploads\/2025\/05\/Spacers1.webp\" alt=\"Spacers\" class=\"wp-image-2535\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Peptide design is a delicate balance of structure, function, and stability. One critical yet often overlooked element is the\u00a0<strong>spacer<\/strong>, a molecular linker that separates functional groups or enhances peptide performance. Selecting the right spacer can influence\u00a0<strong>solubility<\/strong>,\u00a0<strong>conformational flexibility<\/strong>, and\u00a0<strong>biological activity<\/strong>, making it essential for applications like drug delivery, diagnostics, and bioconjugation. This article explores the types, roles, and selection criteria for\u00a0<strong>peptide spacers<\/strong>, with insights from LifeTein, a leader in peptide synthesis technologies.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 id=\"key-takeaways\" class=\"wp-block-heading\">Key Takeaways<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Spacers<\/strong>\u00a0improve\u00a0<strong>solubility<\/strong>, reduce steric hindrance, and enhance peptide stability.<\/li>\n\n\n\n<li>Common spacers include\u00a0<strong>PEG (polyethylene glycol)<\/strong>,\u00a0<strong>Ahx (aminohexanoic acid)<\/strong>, and\u00a0<strong>\u03b2-alanine<\/strong>.<\/li>\n\n\n\n<li>Choice depends on application:\u00a0<strong>PEG spacers<\/strong>\u00a0for solubility,\u00a0<strong>Ahx<\/strong>\u00a0for rigidity, and\u00a0<strong>cleavable spacers<\/strong>\u00a0for controlled release.<\/li>\n\n\n\n<li><strong>Hydrophobic spacers<\/strong>\u00a0like Ahx may aggregate in aqueous solutions, while\u00a0<strong>hydrophilic spacers<\/strong>\u00a0like PEG improve biocompatibility.<\/li>\n\n\n\n<li>LifeTein recommends optimizing spacer length and chemistry to match experimental goals.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 id=\"the-role-of-spacers-in-peptide-design\" class=\"wp-block-heading\">The Role of Spacers in Peptide Design<\/h2>\n\n\n\n<h4 id=\"why-spacers-matter\" class=\"wp-block-heading\">Why Spacers Matter<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Spacers<\/strong>&nbsp;act as molecular bridges between functional domains, ensuring proper orientation and minimizing steric clashes. For instance, in fluorescently labeled peptides, a spacer separates the dye from the peptide backbone to prevent&nbsp;<strong>quenching<\/strong>&nbsp;or interference with binding sites. Additionally, spacers can enhance&nbsp;<strong>proteolytic stability<\/strong>&nbsp;by shielding sensitive regions from enzymatic degradation.<\/p>\n\n\n\n<h4 id=\"key-properties-of-effective-spacers\" class=\"wp-block-heading\">Key Properties of Effective Spacers<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">An ideal spacer should:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Improve solubility<\/strong>\u00a0(e.g., PEG spacers reduce aggregation).<\/li>\n\n\n\n<li>Provide\u00a0<strong>conformational flexibility<\/strong>\u00a0or rigidity, depending on the target interaction.<\/li>\n\n\n\n<li>Be chemically inert to avoid unintended reactions.<\/li>\n\n\n\n<li>Be compatible with\u00a0<strong>solid-phase peptide synthesis (SPPS)<\/strong>\u00a0workflows.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.lifetein.com\/Peptide_Modifications_Pegylation_Linker.html\" target=\"_blank\" rel=\"noopener\" title=\"\">Find LifeTein&#8217;s list of spacers here<\/a>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 id=\"common-types-of-peptide-spacers\" class=\"wp-block-heading\">Common Types of Peptide Spacers<\/h2>\n\n\n\n<h4 id=\"pegbased-spacers\" class=\"wp-block-heading\">PEG-Based Spacers<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Polyethylene glycol (PEG)<\/strong>&nbsp;is a hydrophilic, non-immunogenic spacer widely used to enhance solubility and prolong circulation time in vivo. Lifetein highlights its utility in&nbsp;<strong>therapeutic peptides<\/strong>&nbsp;and&nbsp;<strong>drug conjugates<\/strong>, where PEGylation reduces renal clearance and improves bioavailability.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Applications<\/strong>: Drug delivery, bioconjugation, and reducing immunogenicity.<\/li>\n\n\n\n<li><strong>Drawbacks<\/strong>: PEG can oxidize over time, and anti-PEG antibodies have been reported in clinical settings.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"600\" height=\"192\" src=\"https:\/\/lifetein.com\/blog\/wp-content\/uploads\/2025\/05\/Spacers2.webp\" alt=\"Spacers\" class=\"wp-image-2537\" srcset=\"https:\/\/www.lifetein.com\/blog\/wp-content\/uploads\/2025\/05\/Spacers2.webp 600w, https:\/\/www.lifetein.com\/blog\/wp-content\/uploads\/2025\/05\/Spacers2-300x96.webp 300w, https:\/\/www.lifetein.com\/blog\/wp-content\/uploads\/2025\/05\/Spacers2-500x160.webp 500w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/figure>\n\n\n\n<h4 id=\"amino-acidbased-spacers\" class=\"wp-block-heading\">Amino Acid-Based Spacers<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Ahx (aminohexanoic acid)<\/strong>&nbsp;and&nbsp;<strong>\u03b2-alanine<\/strong>&nbsp;are popular rigid spacers that provide predictable spacing without introducing chirality.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Ahx<\/strong>: A 6-carbon linker ideal for creating defined distances between functional groups.<\/li>\n\n\n\n<li><strong>\u03b2-alanine<\/strong>: A shorter, flexible spacer used in\u00a0<strong>fluorescent probes<\/strong>\u00a0and\u00a0<strong>peptide nucleic acids (PNAs)<\/strong>.<\/li>\n<\/ul>\n\n\n\n<h4 id=\"cleavable-spacers\" class=\"wp-block-heading\">Cleavable Spacers<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Enzyme-sensitive<\/strong>&nbsp;or&nbsp;<strong>pH-sensitive spacers<\/strong>&nbsp;enable controlled release of therapeutic payloads. For example, a&nbsp;<strong>Val-Cit-PABC<\/strong>&nbsp;spacer is cleaved by cathepsin B in lysosomes, making it valuable in antibody-drug conjugates (ADCs).<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 id=\"factors-to-consider-when-choosing-a-spacer\" class=\"wp-block-heading\">Factors to Consider When Choosing a Spacer<\/h2>\n\n\n\n<h4 id=\"solubility-and-hydrophobicity\" class=\"wp-block-heading\">Solubility and Hydrophobicity<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Hydrophilic spacers<\/strong>&nbsp;like PEG are optimal for aqueous environments, while&nbsp;<strong>hydrophobic spacers<\/strong>&nbsp;(e.g., Ahx) may require organic solvents or detergents to prevent aggregation.<\/p>\n\n\n\n<h4 id=\"conformational-flexibility\" class=\"wp-block-heading\">Conformational Flexibility<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Flexibility of a chosen spacer can influence future interactions or desired orientations.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Flexible spacers<\/strong>\u00a0(e.g., PEG, glycine-rich sequences) allow dynamic interactions.<\/li>\n\n\n\n<li><strong>Rigid spacers<\/strong>\u00a0(e.g., Ahx, proline derivatives) enforce specific orientations.<\/li>\n<\/ul>\n\n\n\n<h4 id=\"length-and-steric-effects\" class=\"wp-block-heading\">Length and Steric Effects<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Longer spacers (&gt;10 atoms) reduce steric hindrance but may introduce unwanted flexibility. Lifetein recommends iterative testing to identify the optimal length for your target application.<\/p>\n\n\n\n<h4 id=\"synthetic-compatibility\" class=\"wp-block-heading\">Synthetic Compatibility<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Ensure the spacer\u2019s chemical stability during SPPS. For example,&nbsp;<strong>acid-labile spacers<\/strong>&nbsp;require milder cleavage conditions to avoid degradation.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 id=\"applications-of-spacers-in-peptide-science\" class=\"wp-block-heading\">Applications of Spacers in Peptide Science<\/h2>\n\n\n\n<h2 id=\"drug-delivery-systems\" class=\"wp-block-heading\">Drug Delivery Systems<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Spacers like&nbsp;<strong>PEG<\/strong>&nbsp;and&nbsp;<strong>cleavable linkers<\/strong>&nbsp;are critical in&nbsp;<strong>targeted therapeutics<\/strong>, enabling precise release of cytotoxic agents at disease sites.<\/p>\n\n\n\n<h4 id=\"bioconjugation-and-labeling\" class=\"wp-block-heading\">Bioconjugation and Labeling<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">In\u00a0<strong>fluorescent labeling<\/strong>, spacers prevent dye-peptide interactions that could alter binding affinity. LifeTein\u2019s protocols often incorporate\u00a0<strong>Ahx<\/strong>\u00a0or\u00a0<strong>PEG4<\/strong>\u00a0spacers for this purpose.<\/p>\n\n\n\n<h4 id=\"structural-studies\" class=\"wp-block-heading\">Structural Studies<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Rigid spacers help stabilize peptide conformations in NMR or crystallography studies, providing more precise structural data.<br \/><br \/><a href=\"https:\/\/www.lifetein.com\/peptide_synthesis_services.html\" target=\"_blank\" rel=\"noopener\" title=\"\">Find out more about peptide synthesis here<\/a>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 id=\"faq\" class=\"wp-block-heading\">FAQ<\/h2>\n\n\n\n<h4 id=\"how-do-i-choose-between-flexible-and-rigid-spacers\" class=\"wp-block-heading\">How do I choose between flexible and rigid spacers?<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Consider the&nbsp;<strong>binding mechanism<\/strong>: Flexible spacers suit dynamic interactions (e.g., cell-penetrating peptides), while rigid spacers are better for fixed orientations (e.g., epitope mapping).<\/p>\n\n\n\n<h4 id=\"can-spacer-length-affect-biological-activity\" class=\"wp-block-heading\">Can spacer length affect biological activity?<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Yes. Longer spacers may reduce potency by increasing the distance between functional domains. Conduct&nbsp;<strong>dose-response assays<\/strong>&nbsp;to optimize.<\/p>\n\n\n\n<h4 id=\"what-spacer-is-best-for-improving-solubility\" class=\"wp-block-heading\">What spacer is best for improving solubility?<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>PEG spacers<\/strong>&nbsp;(e.g., PEG3, PEG6) are gold standards for enhancing aqueous solubility and reducing aggregation.<\/p>\n\n\n\n<h4 id=\"are-spacers-compatible-with-solidphase-synthesis\" class=\"wp-block-heading\">Are spacers compatible with solid-phase synthesis?<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Most spacers are SPPS-compatible, but&nbsp;<strong>bulky<\/strong>&nbsp;or&nbsp;<strong>acid-sensitive spacers<\/strong>&nbsp;may require modified protocols.<\/p>\n\n\n\n<h4 id=\"do-spacers-influence-immunogenicity\" class=\"wp-block-heading\">Do spacers influence immunogenicity?<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Yes. PEG spacers can reduce immunogenicity, but pre-existing anti-PEG antibodies in some patients may limit their utility.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Peptide design is a delicate balance of structure, function, and stability. One critical yet often overlooked element is the\u00a0spacer, a molecular linker that separates functional groups or enhances peptide performance. Selecting the right spacer can influence\u00a0solubility,\u00a0conformational flexibility, and\u00a0biological activity, making &hellip; <a href=\"https:\/\/www.lifetein.com\/blog\/what-spacers-should-i-use-in-my-peptides\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":6,"featured_media":2535,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-2524","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-peptide_synthesis"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Peptide design is a delicate balance of structure, function, and stability. One critical yet often overlooked element is the spacer, a molecular linker that separates functional groups or enhances peptide performance. Selecting the right spacer can influence solubility, conformational flexibility, and biological activity, making it essential for applications like drug delivery, diagnostics, and bioconjugation. This article explores the types,\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Jesse Zuccaro\"\/>\n\t<meta name=\"google-site-verification\" content=\"xKDW6DUiGuZ6nwglNeWlVWTgzTtMPzas13ROL63ytTc\" \/>\n\t<meta name=\"msvalidate.01\" content=\"5B15601215D876311F84CFEFB0F72F18\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/www.lifetein.com\/blog\/what-spacers-should-i-use-in-my-peptides\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"LifeTein Peptide Synthesis Blog\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"What Spacers Should I Use in My Peptides? | LifeTein Peptide Blog\" \/>\n\t\t<meta property=\"og:description\" content=\"Peptide design is a delicate balance of structure, function, and stability. One critical yet often overlooked element is the spacer, a molecular linker that separates functional groups or enhances peptide performance. Selecting the right spacer can influence solubility, conformational flexibility, and biological activity, making it essential for applications like drug delivery, diagnostics, and bioconjugation. This article explores the types,\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/www.lifetein.com\/blog\/what-spacers-should-i-use-in-my-peptides\/\" \/>\n\t\t<meta property=\"fb:admins\" content=\"233983946638783\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/www.lifetein.com\/blog\/wp-content\/uploads\/2020\/02\/LifeTein-Blog1-2-scaled.jpg\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/www.lifetein.com\/blog\/wp-content\/uploads\/2020\/02\/LifeTein-Blog1-2-scaled.jpg\" \/>\n\t\t<meta property=\"article:tag\" content=\"peptide\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2025-05-14T16:36:52+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2025-05-14T16:36:53+00:00\" \/>\n\t\t<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/LifeTein-LLC-233983946638783\/\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:site\" content=\"@lifetein\" \/>\n\t\t<meta name=\"twitter:title\" content=\"What Spacers Should I Use in My Peptides? | LifeTein Peptide Blog\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Peptide design is a delicate balance of structure, function, and stability. One critical yet often overlooked element is the spacer, a molecular linker that separates functional groups or enhances peptide performance. Selecting the right spacer can influence solubility, conformational flexibility, and biological activity, making it essential for applications like drug delivery, diagnostics, and bioconjugation. This article explores the types,\" \/>\n\t\t<meta name=\"twitter:creator\" content=\"@lifetein\" \/>\n\t\t<meta name=\"twitter:image\" content=\"https:\/\/www.lifetein.com\/blog\/wp-content\/uploads\/2020\/02\/LifeTein-Blog1-2-scaled.jpg\" \/>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"What Spacers Should I Use in My Peptides? | LifeTein Peptide Blog","description":"Peptide design is a delicate balance of structure, function, and stability. One critical yet often overlooked element is the spacer, a molecular linker that separates functional groups or enhances peptide performance. Selecting the right spacer can influence solubility, conformational flexibility, and biological activity, making it essential for applications like drug delivery, diagnostics, and bioconjugation. This article explores the types,","canonical_url":"https:\/\/www.lifetein.com\/blog\/what-spacers-should-i-use-in-my-peptides\/","robots":"max-image-preview:large","keywords":"","webmasterTools":{"google-site-verification":"xKDW6DUiGuZ6nwglNeWlVWTgzTtMPzas13ROL63ytTc","msvalidate.01":"5B15601215D876311F84CFEFB0F72F18","miscellaneous":""},"schema":null,"og:locale":"en_US","og:site_name":"LifeTein Peptide Synthesis Blog","og:type":"article","og:title":"What Spacers Should I Use in My Peptides? | LifeTein Peptide Blog","og:description":"Peptide design is a delicate balance of structure, function, and stability. One critical yet often overlooked element is the spacer, a molecular linker that separates functional groups or enhances peptide performance. Selecting the right spacer can influence solubility, conformational flexibility, and biological activity, making it essential for applications like drug delivery, diagnostics, and bioconjugation. This article explores the types,","og:url":"https:\/\/www.lifetein.com\/blog\/what-spacers-should-i-use-in-my-peptides\/","fb:admins":"233983946638783","og:image":"https:\/\/www.lifetein.com\/blog\/wp-content\/uploads\/2020\/02\/LifeTein-Blog1-2-scaled.jpg","og:image:secure_url":"https:\/\/www.lifetein.com\/blog\/wp-content\/uploads\/2020\/02\/LifeTein-Blog1-2-scaled.jpg","article:tag":["peptide"],"article:published_time":"2025-05-14T16:36:52+00:00","article:modified_time":"2025-05-14T16:36:53+00:00","article:publisher":"https:\/\/www.facebook.com\/LifeTein-LLC-233983946638783\/","twitter:card":"summary_large_image","twitter:site":"@lifetein","twitter:title":"What Spacers Should I Use in My Peptides? | LifeTein Peptide Blog","twitter:description":"Peptide design is a delicate balance of structure, function, and stability. One critical yet often overlooked element is the spacer, a molecular linker that separates functional groups or enhances peptide performance. Selecting the right spacer can influence solubility, conformational flexibility, and biological activity, making it essential for applications like drug delivery, diagnostics, and bioconjugation. This article explores the types,","twitter:creator":"@lifetein","twitter:image":"https:\/\/www.lifetein.com\/blog\/wp-content\/uploads\/2020\/02\/LifeTein-Blog1-2-scaled.jpg"},"aioseo_meta_data":{"post_id":"2524","title":null,"description":null,"keywords":null,"keyphrases":{"focus":{"keyphrase":"spacers","score":87,"analysis":{"keyphraseInTitle":{"score":9,"maxScore":9,"error":0},"keyphraseInDescription":{"score":9,"maxScore":9,"error":0},"keyphraseLength":{"score":9,"maxScore":9,"error":0,"length":1},"keyphraseInURL":{"score":5,"maxScore":5,"error":0},"keyphraseInIntroduction":{"score":9,"maxScore":9,"error":0},"keyphraseInSubHeadings":{"score":9,"maxScore":9,"error":0},"keyphraseInImageAlt":{"score":9,"maxScore":9,"error":0},"keywordDensity":{"type":"high","score":0,"maxScore":9,"error":1}}},"additional":[]},"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":"","og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"Article","isEnabled":true},"graphs":[]},"schema_type":"default","schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":"-1","robots_max_videopreview":"-1","robots_max_imagepreview":"large","priority":null,"frequency":"default","location":null,"local_seo":null,"seo_analyzer_scan_date":null,"breadcrumb_settings":null,"limit_modified_date":false,"open_ai":"{\"title\":{\"suggestions\":[],\"usage\":0},\"description\":{\"suggestions\":[],\"usage\":0}}","ai":null,"created":"2025-05-13 17:04:09","updated":"2025-06-20 10:40:08"},"aioseo_breadcrumb":"<div class=\"aioseo-breadcrumbs\"><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/www.lifetein.com\/blog\" title=\"Home\">Home<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/www.lifetein.com\/blog\/category\/peptide_synthesis\/\" title=\"Peptide\">Peptide<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\tWhat Spacers Should I Use in My Peptides?\n\t\t<\/span><\/div>","aioseo_breadcrumb_json":[{"label":"Home","link":"https:\/\/www.lifetein.com\/blog"},{"label":"Peptide","link":"https:\/\/www.lifetein.com\/blog\/category\/peptide_synthesis\/"},{"label":"What Spacers Should I Use in My Peptides?","link":"https:\/\/www.lifetein.com\/blog\/what-spacers-should-i-use-in-my-peptides\/"}],"_links":{"self":[{"href":"https:\/\/www.lifetein.com\/blog\/wp-json\/wp\/v2\/posts\/2524","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.lifetein.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lifetein.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lifetein.com\/blog\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lifetein.com\/blog\/wp-json\/wp\/v2\/comments?post=2524"}],"version-history":[{"count":4,"href":"https:\/\/www.lifetein.com\/blog\/wp-json\/wp\/v2\/posts\/2524\/revisions"}],"predecessor-version":[{"id":2538,"href":"https:\/\/www.lifetein.com\/blog\/wp-json\/wp\/v2\/posts\/2524\/revisions\/2538"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.lifetein.com\/blog\/wp-json\/wp\/v2\/media\/2535"}],"wp:attachment":[{"href":"https:\/\/www.lifetein.com\/blog\/wp-json\/wp\/v2\/media?parent=2524"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lifetein.com\/blog\/wp-json\/wp\/v2\/categories?post=2524"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lifetein.com\/blog\/wp-json\/wp\/v2\/tags?post=2524"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}