{"id":13481,"date":"2026-02-02T15:22:17","date_gmt":"2026-02-02T15:22:17","guid":{"rendered":"https:\/\/www.sygnaturediscovery.com\/?post_type=technical-note&#038;p=13481"},"modified":"2026-02-02T15:29:43","modified_gmt":"2026-02-02T15:29:43","slug":"chromlogd-assay-validation","status":"publish","type":"technical-note","link":"https:\/\/www.sygnaturediscovery.com\/fr\/technical-note\/chromlogd-assay-validation\/","title":{"rendered":"ChromLogD"},"content":{"rendered":"\n<h2 class=\"wp-block-heading has-text-2-xl-font-size\">About the Assay<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Sygnature Discovery\u2019s ChromLogD assay is a chromatographic method used to determine the lipophilicity of drug molecules by measuring their distribution behavior between aqueous and organic phases. Lipophilicity, expressed as the Log of the distribution coefficient (LogD), is a key determinant of solubility, distribution, permeability and metabolic stability, making its accurate measurement essential for early\u2011stage drug discovery. ChromLogD provides a rapid, robust alternative to traditional shake\u2011flask assays, particularly for highly lipophilic compounds that present quantification challenges due to low solubility in aqueous buffer.<br><br>In this assay, compounds are analysed on a reversed\u2011phase UHPLC system using a gradient of aqueous buffer at physiological pH 7.4 and organic solvent. Retention times are compared against a calibration set of reference compounds with known LogD values. By plotting the logarithm of the chromatographic capacity factor against reference LogD values, a precise calibration line is generated. Test compounds and controls are then assigned ChromLogD values based on their retention characteristics.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-text-2-xl-font-size\" style=\"padding-top:var(--wp--preset--spacing--20)\">Protocol Summary<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The ChromLogD workflow begins with preparation of test compound solutions from 10 mM DMSO stocks, which are diluted into acetonitrile: water to produce standardized working samples. These are transferred to vials or plates for automated UHPLC analysis. Alongside the test articles, calibrants with known LogD values and control compounds are injected to establish system suitability and calibration accuracy.<br><br>During the chromatographic run, compounds elute according to their hydrophobicity, with more lipophilic molecules exhibiting longer retention times. A dedicated dead\u2011volume marker (sodium nitrate) is used to define the void time of the system. Retention times for calibrants are used to calculate the logarithm of the chromatographic capacity factor (logk\u2019), which is plotted against reference LogD values to generate a linear calibration curve. Test and control compound retention times are then fitted to this curve to obtain ChromLogD values.<br><br>This streamlined protocol emphasizes efficient data acquisition, reproducibility across runs and consistent calibration. The approach enables rapid lipophilicity determination without reliance on equilibrium partitioning steps, making it a highly practical tool for high\u2011throughput ADME screening and compound selection workflows.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-text-2-xl-font-size\" style=\"padding-top:var(--wp--preset--spacing--20)\">Validation Results<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The ChromLogD assay validation dataset includes calibrants, dead\u2011volume markers and multiple control compounds to ensure robust performance. The validation demonstrated excellent reproducibility across both inter\u2011assay (figure 1) and intra\u2011assay (figure 2) experiments. Six test compounds\u2014Albendazole, Ketoconazole, Loratidine, Verapamil, Propranolol and Terfenadine\u2014were evaluated across multiple independent runs. Inter\u2011assay mean ChromLogD values were tightly clustered with low coefficients of variation, indicating robust performance across days and experimental batches. Intra\u2011assay results reflected similarly strong reproducibility, with most compounds showing 0% variability across triplicate injections.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-style-rounded-large is-style-rounded-large--1\"><img loading=\"lazy\" decoding=\"async\" width=\"900\" height=\"466\" src=\"https:\/\/www.sygnaturediscovery.com\/wp-content\/uploads\/2026\/02\/image-3.webp\" alt=\"Graph showing inter\u2011assay ChromLogD values for six reference compounds across multiple runs, highlighting tightly clustered means and low variability, demonstrating reproducible chromatographic lipophilicity measurement.\" class=\"wp-image-13485\" srcset=\"https:\/\/www.sygnaturediscovery.com\/wp-content\/uploads\/2026\/02\/image-3.webp 900w, https:\/\/www.sygnaturediscovery.com\/wp-content\/uploads\/2026\/02\/image-3-300x155.webp 300w, https:\/\/www.sygnaturediscovery.com\/wp-content\/uploads\/2026\/02\/image-3-768x398.webp 768w, https:\/\/www.sygnaturediscovery.com\/wp-content\/uploads\/2026\/02\/image-3-640x331.webp 640w\" sizes=\"(max-width: 900px) 100vw, 900px\"><\/figure>\n\n\n\n<p class=\"has-text-sm-font-size wp-block-paragraph\" style=\"padding-top:var(--wp--preset--spacing--20)\"><em><strong>Figure 1.<\/strong> Graph <em>displaying inter-assay ChromLogD data from n=6 assays<\/em><\/em><\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-style-rounded-large is-style-rounded-large--2\"><img loading=\"lazy\" decoding=\"async\" width=\"787\" height=\"490\" src=\"https:\/\/www.sygnaturediscovery.com\/wp-content\/uploads\/2026\/02\/image-4.webp\" alt=\"Graph showing intra\u2011assay ChromLogD results for six test compounds across triplicate injections, with values tightly aligned and most compounds displaying 0% variability, demonstrating excellent within\u2011run reproducibility.\" class=\"wp-image-13487\" srcset=\"https:\/\/www.sygnaturediscovery.com\/wp-content\/uploads\/2026\/02\/image-4.webp 787w, https:\/\/www.sygnaturediscovery.com\/wp-content\/uploads\/2026\/02\/image-4-300x187.webp 300w, https:\/\/www.sygnaturediscovery.com\/wp-content\/uploads\/2026\/02\/image-4-768x478.webp 768w, https:\/\/www.sygnaturediscovery.com\/wp-content\/uploads\/2026\/02\/image-4-578x360.webp 578w, https:\/\/www.sygnaturediscovery.com\/wp-content\/uploads\/2026\/02\/image-4-640x398.webp 640w\" sizes=\"(max-width: 787px) 100vw, 787px\"><\/figure>\n\n\n\n<p class=\"has-text-sm-font-size wp-block-paragraph\" style=\"padding-top:var(--wp--preset--spacing--20)\"><em><strong>Figure 2.<\/strong> Graph <em><em>displaying intra-assay ChromLogD data<\/em><\/em><\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading has-text-2-xl-font-size\" style=\"padding-top:var(--wp--preset--spacing--20)\">Summary<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The data confirms that the ChromLogD platform is reliable, precise and well suited for lipophilicity assessment in discovery programs. It is particularly valuable in early drug discovery for profiling large numbers of compounds and refining medicinal chemistry design strategies.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Sygnature Discovery\u2019s ChromLogD validation demonstrates a fast and reliable chromatographic approach for determining lipophilicity, with excellent reproducibility across inter\u2011 and intra\u2011assay experiments. The method offers a practical, high\u2011throughput alternative to shake\u2011flask assays, supporting confident ADME decision\u2011making in early drug discovery.<\/p>\n","protected":false},"featured_media":0,"template":"","category":[683,719],"resource_tag":[],"class_list":["post-13481","technical-note","type-technical-note","status-publish","hentry","category-dmpk","category-physicochemical-profiling"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>ChromLogD Assay Validation: Chromatographic Lipophilicity<\/title>\n<meta name=\"description\" content=\"Validated ChromLogD assay using chromatographic retention data, with strong inter\u2011 and intra\u2011assay consistency.\" \/>\n<meta name=\"robots\" content=\"noindex, follow\" \/>\n<meta property=\"og:locale\" content=\"fr_CA\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ChromLogD 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