{"id":43368,"date":"2020-10-26T14:30:00","date_gmt":"2020-10-26T14:30:00","guid":{"rendered":"https:\/\/discover.restek.com\/uncategorized\/reduce-downtime-and-cost-of-materials-with-rugged-rxi-5sil-ms-gc-columns\/"},"modified":"2025-12-09T20:33:53","modified_gmt":"2025-12-09T20:33:53","slug":"reduce-downtime-and-cost-of-materials-with-rugged-rxi-5sil-ms-gc-columns","status":"publish","type":"post","link":"https:\/\/discover.restek.com\/de\/articles\/cfar3234\/reduce-downtime-and-cost-of-materials-with-rugged-rxi-5sil-ms-gc-columns","title":{"rendered":"Reduce Downtime and Cost of Materials with Rugged Rxi-5Sil MS GC Columns"},"content":{"rendered":"\n<ul class=\"wp-block-list\">\n<li>Save costs with long column lifetime.<\/li>\n\n\n\n<li>Reduce downtime from column trimming and replacement.<\/li>\n\n\n\n<li>Improve peak shape for active compounds.<\/li>\n<\/ul>\n\n\n\n<p>When performing GC\/MS analysis of drugs, many chemists choose to derivatize samples prior to analysis. Derivatization not only increases the volatility of some drug compounds, but it also reduces activity, resulting in improved peak shape and more accurate quantification. An additional advantage is that derivatized compounds have a higher molecular weight, thus producing more reliable mass spectra than underivatized compounds. Despite these benefits, derivatization reagents are often harsh and can damage analytical columns, leading to high bleed, significant reduction in retention times, and increased tailing for active compounds. Often, this damage is concentrated near the head of the column, so trimming a short length can improve results. However, trimming is a finite solution as repeated clipping ultimately results in decreased efficiency and shorter column lifetimes. Choosing a more rugged column, such as the&nbsp;<a href=\"https:\/\/www.restek.com\/p\/13605\" target=\"_blank\" rel=\"noopener\">Rxi-5Sil MS<\/a>&nbsp;column, is a better alternative. The Rxi-5Sil MS column is extremely stable and holds up to harsh treatment, including repeated exposure to derivatization reagents.<\/p>\n\n\n\n<p>The analysis of amphetamine illustrates the ruggedness of the arylene-based Rxi-5Sil MS polymer. Amphetamine is typically derivatized, because the underivatized form is an active basic compound that produces only a few low molecular weight ions for monitoring. In contrast, upon derivatization, activity decreases, resulting in dramatically improved peak shape and more accurate quantitation. Additionally, several higher molecular weight ions are produced, which can be monitored for definitive identification (Figure 1).<\/p>\n\n\n<div class=\"wp-block-custom-chromatogram-article-top\"><div class=\"chromatogram-article-placeholder\"><div class=\"figure-heading\"><strong>Figure 1:<\/strong>\u00a0Derivatizing amphetamine results in more definitive identification by creating higher molecular weight ions.<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n<style>.kb-image43368_2947f5-29 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image43368_2947f5-29\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"800\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-CFAR3234-01-1024x800.jpg\" alt=\"\" class=\"kb-img wp-image-19174\" title=\"-\" srcset=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-CFAR3234-01-1024x800.jpg 1024w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-CFAR3234-01-300x235.jpg 300w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-CFAR3234-01-768x600.jpg 768w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-CFAR3234-01-1536x1201.jpg 1536w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-CFAR3234-01.jpg 1800w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n<\/div><\/div><\/div>\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Phase Stability Extends Column Lifetime<\/h2>\n\n\n\n<p>In order to demonstrate the ruggedness of the Rxi-5Sil MS column, 400 injections of heptafluorobutyric acid anhydride (HFBA) in butyl chloride were performed. HFBA is a very harsh derivatization reagent, and the concentration of reagent in the solvent was equivalent to that of a derivatized sample. Throughout the course of 400 injections, bleed, retention, and peak shape for active compounds was monitored by periodically injecting a\u00a0column test mix\u00a0containing active compounds (1,6-hexanediol, 4-chlorophenol, and dicyclohexylamine). Chromatographic results were remarkably consistent, even after 400 injections (Figure 2). Column bleed was monitored over the course of the experiment and remained below 5pA (Figure 3). The consistency of retention time data and low bleed levels demonstrate phase stability, which results in longer column lifetimes and reduced maintenance and replacement costs.<\/p>\n\n\n<div class=\"wp-block-custom-chromatogram-article-top\"><div class=\"chromatogram-article-placeholder\"><div class=\"figure-heading\"><strong>Figure 2:<\/strong>\u00a0Rugged Rxi-5Sil MS columns produce consistent retention times, even after 400 injections of derivatization reagent.<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n<div class=\"wp-block-custom-chromatogram-article\"><div class=\"wp-block-custom-chromatogram-article\"><div class=\"chromatogram-image regular-image\"><img decoding=\"async\" src=\"https:\/\/ez.restek.com\/images\/cgram\/gc_cf01131.png\" alt=\"Column Test Mix on Rxi-5Sil MS\" title=\"-\"><\/div><p class=\"article-id\" style=\"text-align:center\"> GC_CF01131<\/p><div class=\"chromatogram-peaks\"><h4>Peaks<\/h4><table class=\"peaks col-lg-4 col-12\">\n<thead><tr><th><\/th><th style=\"text-align: left;width: 75px\">Peaks<\/th><\/tr><\/thead>\n<tbody><tr><td class=\"num\">1.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 2-Ethylhexanoic acid\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/149-57-5\/2-Ethylhexanoic acid\" target=\"_blank\" rel=\"noopener\">2-Ethylhexanoic acid<\/a><\/td><\/tr>\n<tr><td class=\"num\">2.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1,6-Hexanediol\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/629-11-8\/1,6-Hexanediol\" target=\"_blank\" rel=\"noopener\">1,6-Hexanediol<\/a><\/td><\/tr>\n<tr><td class=\"num\">3.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 4-Chlorophenol\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/106-48-9\/4-Chlorophenol\" target=\"_blank\" rel=\"noopener\">4-Chlorophenol<\/a><\/td><\/tr>\n<tr><td class=\"num\">4.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Tridecane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/629-50-5\/Tridecane\" target=\"_blank\" rel=\"noopener\">Tridecane<\/a><\/td><\/tr>\n<tr><td class=\"num\">5.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1-Methylnaphthalene\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/90-12-0\/1-Methylnaphthalene\" target=\"_blank\" rel=\"noopener\">1-Methylnaphthalene<\/a><\/td><\/tr>\n<tr><td class=\"num\">6.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for 1-Undecanol\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/112-42-5\/1-Undecanol\" target=\"_blank\" rel=\"noopener\">1-Undecanol<\/a><\/td><\/tr>\n<tr><td class=\"num\">7.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Tetradecane\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/629-59-4\/Tetradecane\" target=\"_blank\" rel=\"noopener\">Tetradecane<\/a><\/td><\/tr>\n<tr><td class=\"num\">8.<\/td><td class=\"cmpd\"><a class=\"cmpd_link\" title=\"View compound information for Dicyclohexylamine\" href=\"https:\/\/ez.restek.com\/compound\/view\/en\/101-83-7\/Dicyclohexylamine\" target=\"_blank\" rel=\"noopener\">Dicyclohexylamine<\/a><\/td><\/tr>\n<\/tbody><\/table><\/div><div class=\"chromatogram-conditions\"><h4>Conditions<\/h4><div class=\"conditions-container container-fluid\"><div class=\"row\"><table class=\"conditions col-lg-6 col-12\"><tr><th class=\"conditions_header\" scope=\"row\">Column<\/th><td>Rxi-5Sil MS, 30 m, 0.25 mm ID, 0.25 \u00b5m (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/13623?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_CF01131\" rel=\"noopener\">cat.# 13623<\/a>)<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Standard\/Sample<\/th><td>Rxi-5Sil MS\/XLB column test mix (<a target=\"_blank\" href=\"https:\/\/www.restek.com\/p\/35226?utm_source=chromatograms&amp;utm_medium=link&amp;utm_campaign=GC_CF01131\" rel=\"noopener\">cat.# 35226<\/a>)<\/td><\/tr><tr><td><\/td><\/td><\/tr>\n<tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Injection<\/th><td><\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Inj. Vol.:<\/th><td>1.0 \u00b5L split (split ratio 60:1)<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Liner:<\/th><td>4 mm recessed single taper<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Inj. Temp.:<\/th><td>250 \u00b0C<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\" colspan=\"2\">Oven<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Oven Temp.:<\/th><td>125 &#176;C<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Carrier Gas<\/th><td>He, constant pressure<\/td><\/tr><tr><th class=\"sub conditions_header\" scope=\"row\">Linear Velocity:<\/th><td>36 cm\/sec @ 125 \u00b0C<\/td><\/tr><\/table><table class=\"conditions col-lg-6 col-12\"><tr><th class=\"conditions_header\" scope=\"row\">Detector<\/th><td>FID @ 320 \u00b0C<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Instrument<\/th><td>Agilent\/HP6890  GC<\/td><\/tr><tr class=\"cgram_header_row\"><th class=\"conditions_header\" scope=\"row\">Notes<\/th><td>Liner cat.# 20983 was used to produce this chromatogram, but it has since been discontinued. We recommend cat.# 20984 as an alternative. For assistance choosing a replacement for this application, contact Restek Technical Service or your local Restek representative.<br \/><\/td><\/tr><\/table><\/div><\/div><\/div><div class=\"chromatogram-pdf-link\"><a href=\"https:\/\/ez.restek.com\/images\/cgram\/gc_cf01131.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"18\" height=\"18\" viewBox=\"0 0 18 18\"><g data-name=\"Group 2996\"><path data-name=\"Rectangle 1246\" d=\"M0 0h18v18H0z\" style=\"fill: none;\"><\/path><\/g><g data-name=\"Group 2997\"><path data-name=\"Path 729\" d=\"M13.412 11.4v2.017H5.345V11.4H4v2.017a1.349 1.349 0 0 0 1.345 1.345h8.068a1.349 1.349 0 0 0 1.345-1.345V11.4zm-.672-2.694-.948-.948-1.741 1.735V4H8.706v5.493L6.965 7.758l-.948.948 3.361 3.361z\" transform=\"translate(-.437 -.414)\" style=\"fill: rgb(13, 123, 196);\"><\/path><\/g><\/svg>Download PDF<\/a><\/div><\/div><\/div>\n<\/div><\/div><\/div>\n\n<div class=\"wp-block-custom-chromatogram-article-top\"><div class=\"chromatogram-article-placeholder\"><div class=\"figure-heading\"><strong>Figure 3:<\/strong>\u00a0Low column bleed results in long column lifetimes, saving labs replacement costs.<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n<style>.kb-image43368_154bc4-4e .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image43368_154bc4-4e\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"483\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-CFAR3234-02-1024x483.jpg\" alt=\"\" class=\"kb-img wp-image-19180\" title=\"-\" srcset=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-CFAR3234-02-1024x483.jpg 1024w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-CFAR3234-02-300x142.jpg 300w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-CFAR3234-02-768x362.jpg 768w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-CFAR3234-02-1536x724.jpg 1536w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-CFAR3234-02.jpg 1800w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n\n<p>Column bleed over 400 injections of HFBA derivatization reagent.<\/p>\n\n<\/div><\/div><\/div>\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Symmetric Peaks for More Accurate Results<\/h2>\n\n\n\n<p>Peak shape was also monitored to ensure column inertness was stable over time\u2014an important factor in maintaining accuracy. Peaks for the active test probes were symmetric even after 400 injections, allowing easy identification and consistent integration (Figure 4). In a second experiment to complement the test probe results, underivatized amphetamine was injected onto a new Rxi-5Sil MS column, an Rxi-5Sil MS column after 400 injections of derivatization reagent, and a new competitor column of equivalent phase chemistry. Even though underivatized amphetamine is highly active, peak symmetry on the Rxi-5Sil MS column was consistent and unaffected by exposure of the column to derivatization reagent (Figure 5). Additionally, peak shape on both the exposed and unexposed Rxi-5Sil MS column was better than that on the new competitor column (Figure 5).<\/p>\n\n\n<div class=\"wp-block-custom-chromatogram-article-top\"><div class=\"chromatogram-article-placeholder\"><div class=\"figure-heading\"><strong>Figure 4:<\/strong>\u00a0Active probes show consistent, symmetric peak shape, demonstrating the inertness needed for accurate quantification.<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n<style>.kb-image43368_2f36f6-ce .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image43368_2f36f6-ce\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"480\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-CFAR3234-03-1024x480.jpg\" alt=\"\" class=\"kb-img wp-image-19186\" title=\"-\" srcset=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-CFAR3234-03-1024x480.jpg 1024w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-CFAR3234-03-300x141.jpg 300w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-CFAR3234-03-768x360.jpg 768w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-CFAR3234-03-1536x719.jpg 1536w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-CFAR3234-03.jpg 1800w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n\n<p>Test probe symmetry over 400 injections of HFBA derivatization reagent.<\/p>\n\n\n\n<p>Symmetry values &lt;1 indicate peak tailing and values &gt;1 indicate fronting.<\/p>\n\n<\/div><\/div><\/div>\n\n<div class=\"wp-block-custom-chromatogram-article-top\"><div class=\"chromatogram-article-placeholder\"><div class=\"figure-heading\"><strong>Figure 5:<\/strong>\u00a0Peak symmetry for underivatized amphetamine is significantly better on an Rxi-5Sil MS than on a competitor column, even after 400 injections of HFBA derivatization reagent.<\/div><div class='chromatogram-article-inner-full'><div class=\"chromatogram-article-inner\">\n<style>.kb-image43368_acdc0b-70 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image43368_acdc0b-70\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"480\" src=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-CFAR3234-04-1024x480.jpg\" alt=\"\" class=\"kb-img wp-image-19192\" title=\"-\" srcset=\"https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-CFAR3234-04-1024x480.jpg 1024w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-CFAR3234-04-300x141.jpg 300w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-CFAR3234-04-768x360.jpg 768w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-CFAR3234-04-1536x719.jpg 1536w, https:\/\/discover.restek.com\/wp-content\/uploads\/figure-article-CFAR3234-04.jpg 1800w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n\n<p>Symmetry values &lt;1 indicate peak tailing and values &gt;1 indicate fronting.<\/p>\n\n<\/div><\/div><\/div>\n\n\n<p><\/p>\n\n\n\n<p>The rugged arylene phase of the\u00a0Rxi-5Sil MS column results in highly stable performance, even under the most demanding of analytical conditions, and its exceptional inertness ensures good peak shape for reproducible quantitation. The stability of the Rxi-5Sil MS column results in longer column lifetimes, reducing both downtime and replacement costs.<\/p>\n\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n        <div class=\"cpb\">\n            <h3 class=\"cpb-heading\">Products Mentioned<\/h3>\n            <hr class=\"cpb-heading-underline\" \/>\n            <div class=\"cpb-list\">\n                                    <div class=\"cpb-item\">\n                        <div class=\"cpb-col cpb-col--left\">\n                            <a class=\"cpb-catalog\" target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\/\/de.restek.com\/p\/13605\">                                Catalog No. 13605                            <\/a>                        <\/div>\n                        <div class=\"cpb-col cpb-col--middle\">\n                            <div class=\"cpb-title\">Rxi-5Sil MS GC Kapillars\u00e4ule, 15 m, 0.25 mm ID, 0.10 \u00b5m<\/div>\n                        <\/div>\n                        <div class=\"cpb-col cpb-col--right\">\n                                                            <a class=\"cpb-view-btn\" target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\/\/de.restek.com\/p\/13605\">Produkt anzeigen<\/a>\n                                                    <\/div>\n                    <\/div>\n                                    <div class=\"cpb-item\">\n                        <div class=\"cpb-col cpb-col--left\">\n                            <a class=\"cpb-catalog\" target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\/\/de.restek.com\/p\/35226\">                                Catalog No. 35226                            <\/a>                        <\/div>\n                        <div class=\"cpb-col cpb-col--middle\">\n                            <div class=\"cpb-title\">XIL-350 S\u00e4ulen-Testmix, jeweils 350 \u03bcg\/mL in Methylenchlord, 1 mL\/Ampulle<\/div>\n                        <\/div>\n                        <div class=\"cpb-col cpb-col--right\">\n                                                            <a class=\"cpb-view-btn\" target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\/\/de.restek.com\/p\/35226\">Produkt anzeigen<\/a>\n                                                    <\/div>\n                    <\/div>\n                            <\/div>\n        <\/div>\n        \n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>New Rxi-5Sil MS columns produce consistent results for amphetamine\u2014even after 400 injections of derivatizing reagent\u2014resulting in less time and money spent on column maintenance and replacement.<\/p>\n","protected":false},"author":37,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kadence_starter_templates_imported_post":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"footnotes":""},"categories":[7],"tags":[],"industries-application":[2153,2156,2170,2171],"post-badge":[],"resource-type":[],"product-library":[2372,2384],"resource-technique":[2294],"hf_cat_post":[650],"ppma_author":[511,581],"class_list":["post-43368","post","type-post","status-publish","format-standard","hentry","category-articles","industries-application-clinical","industries-application-clinical-toxicology","industries-application-forensics","industries-application-forensics-toxicology","product-library-gas-chromatography-products","product-library-gc-columns","resource-technique-gas-chromatography-gc"],"acf":[],"taxonomy_info":{"category":[{"value":7,"label":"Articles"}],"industries-application":[{"value":2153,"label":"Clinical"},{"value":2156,"label":"Clinical Toxicology"},{"value":2170,"label":"Forensics"},{"value":2171,"label":"Forensics Toxicology"}],"product-library":[{"value":2372,"label":"Gas Chromatography Products"},{"value":2384,"label":"GC Columns"}],"resource-technique":[{"value":2294,"label":"Gas Chromatography (GC)"}]},"featured_image_src_large":false,"author_info":{"display_name":"Gary Stidsen","author_link":"https:\/\/discover.restek.com\/de\/author\/gary-stidsen\/"},"comment_info":0,"category_info":[{"term_id":7,"name":"Articles","slug":"articles","term_group":0,"term_taxonomy_id":7,"taxonomy":"category","description":"","parent":0,"count":467,"filter":"raw","cat_ID":7,"category_count":467,"category_description":"","cat_name":"Articles","category_nicename":"articles","category_parent":0}],"tag_info":false,"authors":[{"term_id":511,"user_id":0,"is_guest":1,"slug":"amanda-rigdon","display_name":"Amanda Rigdon","avatar_url":"https:\/\/secure.gravatar.com\/avatar\/?s=96&d=mm&r=g","0":null,"1":"","2":"","3":"","4":"","5":"","6":"","7":"","8":""},{"term_id":581,"user_id":37,"is_guest":0,"slug":"gary-stidsen","display_name":"Gary Stidsen","avatar_url":{"url":"https:\/\/discover.restek.com\/wp-content\/uploads\/people-stidsen-gary.png","url2x":"https:\/\/discover.restek.com\/wp-content\/uploads\/people-stidsen-gary.png"},"0":null,"1":"","2":"","3":"","4":"","5":"","6":"","7":"","8":""}],"_links":{"self":[{"href":"https:\/\/discover.restek.com\/de\/wp-json\/wp\/v2\/posts\/43368","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/discover.restek.com\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/discover.restek.com\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/discover.restek.com\/de\/wp-json\/wp\/v2\/users\/37"}],"replies":[{"embeddable":true,"href":"https:\/\/discover.restek.com\/de\/wp-json\/wp\/v2\/comments?post=43368"}],"version-history":[{"count":6,"href":"https:\/\/discover.restek.com\/de\/wp-json\/wp\/v2\/posts\/43368\/revisions"}],"predecessor-version":[{"id":72888,"href":"https:\/\/discover.restek.com\/de\/wp-json\/wp\/v2\/posts\/43368\/revisions\/72888"}],"wp:attachment":[{"href":"https:\/\/discover.restek.com\/de\/wp-json\/wp\/v2\/media?parent=43368"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/discover.restek.com\/de\/wp-json\/wp\/v2\/categories?post=43368"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/discover.restek.com\/de\/wp-json\/wp\/v2\/tags?post=43368"},{"taxonomy":"industries-application","embeddable":true,"href":"https:\/\/discover.restek.com\/de\/wp-json\/wp\/v2\/industries-application?post=43368"},{"taxonomy":"post-badge","embeddable":true,"href":"https:\/\/discover.restek.com\/de\/wp-json\/wp\/v2\/post-badge?post=43368"},{"taxonomy":"resource-type","embeddable":true,"href":"https:\/\/discover.restek.com\/de\/wp-json\/wp\/v2\/resource-type?post=43368"},{"taxonomy":"product-library","embeddable":true,"href":"https:\/\/discover.restek.com\/de\/wp-json\/wp\/v2\/product-library?post=43368"},{"taxonomy":"resource-technique","embeddable":true,"href":"https:\/\/discover.restek.com\/de\/wp-json\/wp\/v2\/resource-technique?post=43368"},{"taxonomy":"hf_cat_post","embeddable":true,"href":"https:\/\/discover.restek.com\/de\/wp-json\/wp\/v2\/hf_cat_post?post=43368"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/discover.restek.com\/de\/wp-json\/wp\/v2\/ppma_author?post=43368"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}