Sygnature Discovery\u2019s Chemical Stability assay provides a comprehensive in vitro evaluation of compound degradation across a wide range of physiological and biorelevant media. Chemical stability is essential for predicting the behaviour of orally administered molecules, particularly during transit through the gastrointestinal tract where pH, buffer composition and food effects can significantly influence degradation rates. The assay evaluates non\u2011enzymatic degradation pathways, including hydrolysis, oxidation and other chemical transformations that may occur under different pH and environmental conditions.
The validation assessed stability in phosphate\u2011buffered saline (PBS), biorelevant gastric and intestinal fluids (FaSSGF, FeSSIF, FaSSIF), fed\u2011state gastric media (FEDGAS) and USP\u2011defined buffers. \u00a0Test compounds were incubated in the relevant media, and compound disappearance monitored over time using LC\u2013MS\/MS. Percent remaining and half\u2011life values were calculated from depletion kinetics, providing a robust measure of stability across media.
By incorporating a range of physiological and biorelevant media, the platform enables assessment of compound stability under fasted, fed, gastric, and intestinal conditions, while also supporting evaluation in formulation\u2011relevant environments. Overall, the dataset confirms that the chemical stability platform is an essential early\u2011stage DMPK tool for identifying compounds with suitable stability profiles to progress within oral drug\u2011development programmes.<\/p>\n\n\n\n
The chemical stability assay evaluates the degradation profile of compounds across multiple physiologically relevant media to determine their intrinsic degradation rates. \u00a0Test compounds are first prepared from concentrated DMSO stock solutions, then incubated in the selected buffer or biorelevant medium. \u00a0At predetermined time points, aliquots are removed and quenched immediately using organic solvent to prevent further degradation, generating a time course of compound disappearance.<\/p>\n\n\n\n
Following centrifugation to remove precipitated proteins, supernatants are pooled for cassette analysis (except if screening for prodrugs) and diluted with water containing internal standard. Samples are analysed via LC\u2013MS\/MS to determine the percentage parent compound remaining at each time point. Natural log transformation of compound response\u2013time data enables linear regression to derive the elimination rate constant (k), from which half\u2011life values are calculated, thus providing a quantitative measure of stability.<\/p>\n\n\n\n
This workflow supports high reproducibility by using consistent incubation formats, sampling schedules and analytical conditions. Overall, the assay enables efficient, accurate and physiologically relevant stability assessment for a broad range of drug candidates intended for oral administration.<\/p>\n\n\n\n
Validation across all matrices demonstrated strong reproducibility and robust performance, enabling detailed stability characterisation across diverse pH conditions. Across buffer and biorelevant media, the assay showed acceptable reproducibility, with variability maintained below 20% CV.<\/p>\n\n\n\n
The graph below presents the validated inter\u2011assay data for 0.1M PBS (pH 7.4):<\/p>\n\n\n\n![\"\"](\"https:\/\/www.sygnaturediscovery.com\/wp-content\/uploads\/2026\/02\/image-6.webp\")
<\/figure>\n","protected":false},"excerpt":{"rendered":"","protected":false},"featured_media":0,"template":"","category":[720,683],"resource_tag":[],"class_list":["post-14416","technical-note","type-technical-note","status-publish","hentry","category-chemical-metabolic-stability","category-dmpk"],"acf":[],"yoast_head":"\n