Physicochemical Properties
In the early stages of pharmaceutical R&D, the physicochemical properties of lead compounds are critical determinants of drug-likeness, bioavailability, formulation feasibility, and clinical success. Suboptimal solubility, lipophilicity, or stability often lead to poor absorption, unfavorable ADMET profiles, and costly late-stage failures. Therefore, systematic physicochemical characterization is not merely an option but an essential step to de-risk development, optimize molecular design, and select high-quality candidates for downstream progression. PharmaAnalytica, a brand under STEMart, provides comprehensive physicochemical analysis powered by state-of-the-art instrumentation and expert teams, supporting clients in making informed decisions at the critical lead optimization stage.
Specialized Physicochemical Properties Analysis Services
Equilibrium Solubility Determination with HPLC-UV
Equilibrium solubility (thermodynamic solubility) defines the maximum concentration of a compound attainable in a solvent at solid–liquid equilibrium under physiological conditions. It directly governs dissolution, oral absorption, and formulation performance. PharmaAnalytica's equilibrium solubility service employs the shake-flask method coupled with HPLC-UV quantification to deliver precise, reproducible data. Excess solid compound is incubated in biorelevant media (e.g., FaSSIF, FeSSIF, SGF, pH 1.2/6.5/7.4) at 37°C with agitation until equilibrium (typically 24–48 h). After filtration/centrifugation to remove undissolved solids, supernatants are analyzed via validated HPLC-UV methods. Calibration curves ensure accurate concentration determination. This approach yields true thermodynamic solubility (not kinetic estimates), supporting BCS classification, formulation design, and in vivo performance prediction. Low solubility flags early risks of poor absorption; high solubility supports favorable oral delivery. Our platform minimizes matrix interference, ensures data robustness, and complies with regulatory guidelines (ICH, FDA, USP), providing clients with reliable solubility profiles to guide structural modification and formulation development.
Lipophilicity Determination with UV-Potentiometric Titration
Lipophilicity (logP/logD) governs membrane permeation, protein binding, tissue distribution, and metabolic clearance. It is central to Lipinski's Rule of Five and ADMET optimization. PharmaAnalytica uses UV-Potentiometric Titration (a gold-standard technique) to measure logP (neutral species) and logD (pH-dependent distribution, typically pH 7.4). This dual-phase method combines potentiometric pH monitoring with UV spectral analysis in octanol–water systems. Compound ionization (pKa) and partition behavior are simultaneously derived from titration curves and spectral changes across pH. Unlike traditional shake-flask HPLC, this method requires minimal sample (≈1 mg), avoids extraction bias, and generates full logD–pH profiles. Results predict oral absorption, blood–brain barrier penetration, and renal vs. hepatic clearance. Excess lipophilicity correlates with poor solubility, off-target binding, and toxicity; insufficient lipophilicity limits membrane permeation. Our automated platform (Sirius-like instrumentation) delivers high precision (RMSD <0.1 log units) and rapid turnaround. Data directly guide lead optimization: balancing solubility and lipophilicity to enhance druggability.
Why Choose PharmaAnalytica?
Expert Team
Our scientists hold advanced degrees in pharmaceutical chemistry/analytical science with deep experience in physicochemical profiling and regulatory compliance. They design custom protocols, interpret complex data, and provide actionable recommendations for lead optimization.
Cutting-Edge Platform
We operate HPLC-UV systems, automated potentiometric titrators (UV/pH dual detection), precision thermostats, and biorelevant media preparation stations—all GMP-compliant and calibrated to ISO 17025 standards. This ensures accuracy, reproducibility, and alignment with global regulatory guidelines.
Comprehensive Service Portfolio
Beyond solubility and lipophilicity, we offer pKa, stability, hygroscopicity, and powder property testing—one-stop full physicochemical profiling to characterize all critical properties of lead compounds.
Customized & Regulatory-Ready Solutions
We tailor protocols to compound class (small molecules, peptides, poorly soluble drugs) and deliver ICH-aligned, audit-ready reports to support IND/NDA submissions, reducing regulatory risks and accelerating development timelines.
PharmaAnalytica's physicochemical analysis service is an indispensable pillar of early drug R&D. By accurately measuring equilibrium solubility and lipophilicity via advanced HPLC-UV and UV-potentiometric titration, we empower clients to identify development risks, optimize molecular structures, and select superior lead candidates. Backed by STEMart's global resources, our expert team, state-of-the-art platforms, comprehensive assays, and regulatory expertise ensure high-quality data, strategic insights, and accelerated success from lead to clinic. Partner with PharmaAnalytica to turn promising leads into safe, effective, and commercially viable medicines.
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