Centrifugal Partition Chromatography (CPC) separates compounds by repeatedly distributing a sample between two non-mixing liquid layers inside a rotating column. Because each molecule prefers one liquid phase more than the other, target compounds move through the system at different speeds and can be collected without using a solid adsorbent. Unlike conventional solid-phase chromatography, CPC helps minimize irreversible adsorption, sample loss, and silica-related waste, making it especially useful for complex synthetic, botanical, fermentation-derived, and impurity-rich matrices. For pharmaceutical researchers, medicinal chemists, natural product scientists, and process development teams, the main challenge is not simply running CPC—it is selecting the right biphasic solvent system, defining reliable KD windows, resolving structurally similar components, and translating the method from milligram screening to gram- or kilogram-oriented purification. BOC Sciences provides comprehensive centrifugal partition chromatography services covering feasibility assessment, solvent system screening, CPC method development, target fraction isolation, impurity enrichment, and scale-up strategy design. Our platform helps clients obtain purified fractions, improve recovery of labile molecules, reduce purification burden, and build practical workflows for discovery, analytical, and development-stage projects.
We design CPC-ready biphasic systems by evaluating compound polarity, solubility, phase stability, settling behavior, and partition coefficient distribution. This front-end work connects CPC with broader analysis and purification strategies for complex drug discovery samples.
Our scientists develop CPC methods that align rotor speed, flow rate, stationary phase retention, elution mode, and fraction collection windows. When CPC is compared or combined with other chromatographic options, we use chromatography testing data to support rational method selection.
BOC Sciences supports the isolation of natural products, synthetic intermediates, degradants, metabolites, peptides, lipids, and bioactive fractions. CPC can be positioned as a primary purification tool or integrated with preparative HPLC for final polishing.
For teams requiring enough material for structural assignment, reference preparation, or process understanding, our CPC platform enriches trace components from crude or partially purified samples. We combine this with impurity isolation and identification workflows when deeper characterization is required.
BOC Sciences develops liquid-liquid chromatographic workflows that improve recovery, reduce solid adsorbent dependency, and isolate valuable molecules from complex pharmaceutical and natural product samples.
We screen solvent systems across polarity ranges to identify phase pairs that provide suitable KD values, stable phase separation, adequate sample solubility, and practical selectivity for the target molecule and its closest impurities.
CPC retains the liquid stationary phase in rotor cells through centrifugal force, allowing the mobile phase to pass through repeated mixing and settling zones. This enables preparative separation without silica or resin-based stationary media.
We apply normal elution, reverse elution, extrusion, and dual-mode strategies when a single elution direction cannot recover all valuable components efficiently, especially for samples containing both early- and late-eluting targets.
CPC fractions are monitored using orthogonal analytical tools, including LC, MS, UV, ELSD, and NMR-based confirmation when appropriate. These data help define pooling logic, impurity clearance, and target recovery.
CPC can be combined with flash column chromatography, HPLC polishing, crystallization, or solvent extraction to create efficient workflows for samples that cannot be solved by a single technique.
Our team evaluates loading capacity, phase retention, pressure profile, solvent consumption, and fraction concentration requirements to support smooth transition from discovery-scale screening to larger purification campaigns.
BOC Sciences provides centrifugal partition chromatography services for a broad range of pharmaceutical, chemical, and natural product samples. Our scientists evaluate each sample based on solubility, matrix complexity, target concentration, ionization behavior, and downstream analytical requirements to determine whether CPC alone or a combined purification route is most suitable.
Submit your crude extract, reaction mixture, target structure, or current purification challenge. Our chromatography scientists will design a CPC strategy tailored to your sample behavior, recovery goals, and downstream analytical needs.
We review the target structure, crude sample composition, available analytical data, solubility information, and desired output. For API-related projects, CPC can be connected with API analysis to clarify identity, purity, and impurity trends before preparative work begins.
Using shake-flask partition tests and analytical profiling, we identify solvent systems that balance target retention, impurity separation, phase stability, and sample loading. When rapid qualitative checks are useful, TLC services may support early solvent selection.
We define rotor speed, flow rate, phase direction, injection concentration, fraction timing, and elution mode. Scale translation considers stationary phase retention, pressure behavior, solvent volume, and target mass balance for reliable preparative operation.
Target-rich fractions are collected, pooled, concentrated, and analyzed. Clients receive chromatograms, fraction maps, recovery estimates, solvent system rationale, and practical recommendations for further purification, characterization, or larger-scale separation.
Many polar, amphiphilic, metal-chelating, or highly conjugated molecules interact strongly with silica, resin, or other solid supports, causing tailing, degradation, or unrecovered material. CPC replaces the solid stationary phase with a liquid phase, helping preserve valuable compounds while improving mass balance. BOC Sciences evaluates CPC as an alternative or complementary option when conventional column chromatography services cannot deliver acceptable recovery.
Natural extracts often contain analogs with nearly identical UV profiles, close retention on HPLC, and overlapping biological activity. We use systematic solvent family screening, KD mapping, and staged CPC fractionation to separate homologous or isomeric compounds. For difficult matrices, CPC is paired with targeted polishing or custom purification services to improve fraction quality.
When an impurity is present at low abundance, direct structure elucidation may fail because the available material is insufficient. BOC Sciences develops CPC enrichment workflows that concentrate impurity-containing fractions while reducing matrix complexity. These enriched fractions can then be connected with impurities identification and characterization to support confident structural assignment.
Preparative silica or resin workflows may become inefficient when large crude loads, sticky samples, or solvent-intensive gradients are involved. CPC reduces dependency on disposable solid adsorbents and enables solvent system reuse strategies where chemically appropriate. For larger purification needs, our team designs scale-aware CPC methods that can interface with large scale separation planning.
Collaborate with BOC Sciences to transform difficult extracts, reaction mixtures, impurity pools, and labile compounds into useful purified fractions. Our team combines solvent science, chromatographic method development, fraction analytics, and scale-up thinking to improve purification efficiency.
BOC Sciences does not treat CPC as a push-button separation. We evaluate solvent chemistry, KD behavior, sample solubility, phase retention, and fraction analytics to build methods that address the actual reason a purification has failed.
Liquid-liquid operation helps reduce irreversible adsorption and enables gentle recovery of compounds that are sticky, labile, amphiphilic, or sensitive to solid supports. This is especially valuable when sample quantity is limited or synthesis is costly.
CPC can be combined with reverse-phase chromatography services, normal-phase chromatography services, crystallization, or targeted analytical workflows to achieve the desired separation outcome.
Clients receive more than isolated material. Our project output can include solvent selection logic, chromatographic profiles, fraction identity data, mass recovery estimates, purification recommendations, and scale-up considerations for future campaigns.
Client Needs: A natural product research group needed to isolate two closely related indole alkaloids from a 180 g botanical extract. Their previous silica chromatography workflow caused severe tailing, poor recovery, and overlapping fractions that were unsuitable for biological evaluation.
Challenges: The target alkaloids showed similar UV absorbance and nearly identical retention under conventional reversed-phase conditions. The crude extract also contained pigments, tannins, and weakly basic analogs that created emulsions during simple liquid-liquid extraction.
Solution: BOC Sciences screened 24 biphasic solvent systems and selected a modified HEMWat system with controlled acid-base adjustment. We measured KD values for both target alkaloids, optimized descending CPC mode, completed six preparative injections, and monitored 96 collected fractions by LC-MS and UV profiling. Target-rich pools were consolidated and polished by short HPLC runs.
Outcome: The workflow delivered purified alkaloid fractions with strong mass recovery and clear chromatographic separation, enabling the client to proceed with structure confirmation and activity testing.
Client Needs: A small molecule development team required milligram quantities of a low-level oxidation impurity from an aromatic API intermediate. Direct preparative HPLC was inefficient because the impurity co-eluted with the parent compound and degraded during prolonged processing.
Challenges: The impurity represented less than 1% of the mixture and had only a subtle polarity difference from the main component. The sample was sensitive to basic conditions, and repeated concentration steps increased degradation risk.
Solution: We performed targeted solvent screening, selected a neutral biphasic system, and used CPC as a pre-enrichment step before analytical-guided pooling. Across four preparative CPC runs, 72 fractions were collected and analyzed by LC-MS. The impurity-enriched pools were concentrated under mild conditions and subjected to a final short polishing step to provide material suitable for structural work.
Outcome: CPC enrichment increased impurity abundance in the collected pool by more than 20-fold, reducing the burden on final polishing and providing sufficient material for advanced characterization.
Client Needs: A biotechnology client developing lipid-based delivery materials needed to separate an amphiphilic ionizable lipid from late-stage synthetic by-products. Traditional normal-phase methods caused broad peaks, solvent-heavy workflows, and incomplete recovery.
Challenges: The lipid contained tertiary amine and ester functionalities, making it sensitive to harsh pH and prone to adsorption on silica. Closely related hydrophobic impurities complicated direct purification and reduced the usefulness of standard gradient methods.
Solution: BOC Sciences evaluated non-halogenated and mixed alcohol-water solvent systems, then selected a biphasic system that balanced lipid solubility and impurity partitioning. We optimized rotor speed and flow rate to maintain stationary phase retention above the project target, completed three scale-up runs, collected 54 fractions, and applied LC-CAD profiling to guide pooling decisions.
Outcome: The CPC workflow reduced adsorption-related loss, generated cleaner lipid pools, and provided a more practical preparative route for follow-up formulation research.
Centrifugal partition chromatography is well suited for complex mixtures that are difficult to purify using conventional solid-phase chromatography. Typical samples include natural product extracts, fermentation-derived metabolites, plant secondary metabolites, synthetic intermediates, structurally similar small molecules, lipid-like compounds, and polarity-sensitive drug discovery samples. Because CPC uses liquid-liquid partition rather than irreversible adsorption on a solid stationary phase, it is especially useful when target compounds show poor recovery, strong adsorption, broad peak tailing, or instability on silica-based media. BOC Sciences can evaluate sample composition, solubility, target abundance, and downstream analytical needs to design a practical CPC purification strategy.
CPC differs from traditional column chromatography because it does not use silica gel, resin, or other solid packing materials as the stationary phase. Instead, one liquid phase is retained inside the rotor by centrifugal force while another liquid phase moves through the system, allowing compounds to separate according to their partition behavior. This liquid-liquid mechanism helps reduce sample loss caused by irreversible adsorption and can improve recovery for sensitive or highly complex samples. For pharmaceutical and natural product projects, CPC also offers flexible solvent system design, scalable separation conditions, and strong compatibility with preparative fraction collection.
CPC method development begins with understanding the target compound, sample matrix, solubility profile, and available analytical data. BOC Sciences typically screens multiple biphasic solvent systems to identify a suitable partition coefficient range for the target compound and key impurities. The process may involve adjusting solvent ratios, pH, salt content, elution direction, flow rate, rotation speed, and sample loading strategy. After initial feasibility testing, the selected method is refined through fraction tracking by HPLC, LC-MS, UV, or other suitable analytical techniques. The goal is to build a robust separation method that produces enriched target fractions with practical recovery and reproducibility.
BOC Sciences provides integrated CPC services covering feasibility assessment, biphasic solvent system screening, partition coefficient evaluation, method development, preparative separation, fraction collection, fraction profiling, enrichment of target components, and post-separation concentration support. Our team can support projects involving natural products, complex extracts, synthetic mixtures, fermentation samples, and small-molecule discovery compounds. For clients who already have partial analytical data, we can adapt the CPC strategy to match existing HPLC or MS workflows. For unknown or activity-guided samples, we can help design fractionation logic that supports downstream structure identification, activity testing, and process optimization.
To design an efficient CPC project, clients are encouraged to provide sample source, approximate sample amount, target compound information, known or suspected structure, solubility behavior, existing HPLC or LC-MS profiles, preferred detection wavelength, target fraction use, and any solvent limitations. If the target compound is unknown, chromatograms, mass signals, bioactivity tracking results, or reference fractions can help guide method development. BOC Sciences uses this information to select solvent screening conditions, estimate separation feasibility, reduce unnecessary method iterations, and define an appropriate fraction collection strategy. Clear sample information helps improve project efficiency and supports a more targeted purification workflow.
Our internal team had tried several extraction and HPLC routes without recovering enough target compound. BOC Sciences approached the problem from partition behavior first, and their CPC method gave us a clear, technically defensible path forward.
— Dr. Osborne, Principal Scientist, Natural Products Research
We needed enough of a trace impurity for structural analysis, but direct prep-HPLC was wasting sample. Their CPC enrichment strategy greatly simplified the matrix and made the final isolation step much more efficient.
— Sinclair, Director of Process Chemistry
BOC Sciences did not stop at a small demonstration run. Their report explained loading limits, phase retention behavior, solvent use, and pooling recommendations, which helped our team judge whether CPC could support larger purification campaigns.
— Holloway, CMC Project Manager
Our lipid compound was difficult to purify on silica and showed poor recovery. The CPC workflow from BOC Sciences reduced adsorption concerns and delivered cleaner fractions for our downstream formulation experiments.
— Dalton, Senior Formulation Scientist
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