{"id":13515,"date":"2026-02-02T17:14:39","date_gmt":"2026-02-02T17:14:39","guid":{"rendered":"https:\/\/www.sygnaturediscovery.com\/?post_type=technical-note&#038;p=13515"},"modified":"2026-02-02T17:18:06","modified_gmt":"2026-02-02T17:18:06","slug":"turbidimetric-kinetic-solubility-assay-validation","status":"publish","type":"technical-note","link":"https:\/\/www.sygnaturediscovery.com\/fr\/technical-note\/turbidimetric-kinetic-solubility-assay-validation\/","title":{"rendered":"Turbidimetric Kinetic Solubility"},"content":{"rendered":"\n<h2 class=\"wp-block-heading has-text-2-xl-font-size\">About the Assay<\/h2>\n\n\n\n<p>Sygnature Discovery\u2019s Turbidimetric Kinetic Solubility Assay provides a high\u2011throughput, reliable approach for determining the solubility of small molecules in aqueous physiological buffer. Using phosphate\u2011buffered saline at pH\u202f7.4, the assay monitors the onset of compound precipitation through turbidity measurements, enabling rapid assessment of kinetic solubility across a broad concentration range. This technique is particularly useful during early discovery, where solubility is a key factor in <em>in vitro<\/em> assays. This assay identifies compounds where low solubility may confound the interpretation of assay results.<\/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>The workflow begins by preparing serial dilutions of each compound in DMSO to establish a range of working concentrations. These solutions are transferred into aqueous buffer in microplate format, where they undergo controlled mixing for 90 minutes. As compounds reach their solubility limit, undissolved material forms particulate matter that scatters light.<\/p>\n\n\n\n<p>A plate reader measures this turbidity at a fixed wavelength (620 nm), and raw absorbance values are normalised against buffer\u2011only blanks. Replicate readings are averaged, and the point at which absorbance crosses a predefined threshold is identified. The solubility range is then defined from the concentrations immediately below and above this threshold.<br><br>This approach streamlines solubility assessment by removing the need for sample centrifugation or chromatographic quantification. The standardised workflow ensures reproducible processing, enabling direct comparison between compounds and assay runs. Its simplicity and robustness make it well\u2011suited for identifying low\u2011solubility liabilities early in discovery programmes.<\/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>Validation results demonstrate strong reproducibility across both inter\u2011 and intra\u2011assay experiments. The positive control set\u2014Diclofenac (>100 \u00b5M), Nicardipine (20-50 \u00b5M) and Pyrene (2-10 \u00b5M) \u2014remained consistent in all runs.\u00a0<\/p>\n\n\n\n<p>The broader compound test set exhibited the expected solubility behaviour: high\u2011solubility compounds such as Fluoxetine, Phenytoin, Omeprazole and Chlorpromazine demonstrated values >100\u202f\u00b5M, while lower\u2011solubility molecules such as Mebendazole (20\u201350\u202f\u00b5M) and Dinitramine (20\u201350\u202f\u00b5M) displayed well\u2011defined solubility ranges.<\/p>\n\n\n\n<p>Together, these results confirm that the Turbidimetric Kinetic Solubility Assay is capable of reliably distinguishing between high, moderate and low solubility classes with excellent reproducibility.<\/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>This turbidimetric approach to solubility measurement enables rapid identification of compounds with aqueous solubility issues that may be relevant to <em>in vitro<\/em> assays employed in the drug discovery process. The validation results demonstrate that the assay performs with excellent reproducibility both within and across assay runs, providing high\u2011quality data to guide <em>in vitro <\/em>assay data interpretation and compound progression decisions.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Sygnature Discovery\u2019s Turbidimetric Kinetic Solubility validation demonstrates a fast, high\u2011throughput method for determining aqueous solubility through turbidity measurements in physiological buffer. With consistent performance across controls and a broad set of test compounds, the assay reliably distinguishes high, moderate and low solubility ranges, supporting early decision\u2011making in in vitro discovery workflows.<\/p>\n","protected":false},"featured_media":0,"template":"","category":[683,719],"resource_tag":[],"class_list":["post-13515","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 v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Turbidimetric Kinetic Solubility: High\u2011Throughput Aqueous Solubility<\/title>\n<meta name=\"description\" content=\"Turbidimetric kinetic solubility assay offering reproducible solubility assessment to identify low\u2011solubility risks early in discovery.\" \/>\n<meta name=\"robots\" content=\"noindex, follow\" \/>\n<meta property=\"og:locale\" content=\"fr_CA\" \/>\n<meta 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