Hydrophilic Interaction Liquid Chromatography (HILIC) is a powerful analytical approach for retaining, separating, and characterizing highly polar, hydrophilic, and ionizable compounds that are often insufficiently resolved by conventional reversed-phase methods. For pharmaceutical researchers, drug development scientists, analytical project managers, and CRO partners, HILIC testing is especially valuable when working with polar APIs, metabolites, oligonucleotides, peptides, glycans, lipids, excipients, degradation products, and process-related impurities. BOC Sciences provides comprehensive HILIC services covering method scouting, retention mechanism evaluation, sample preparation, LC-MS compatible analysis, impurity profiling, and quantitative testing. By integrating HILIC with advanced chromatography testing, LC-MS testing, and tailored analytical workflows, we help clients resolve challenging polar analytes, improve method selectivity, support confident compound characterization, and obtain reliable analytical data for complex drug discovery and development programs.
BOC Sciences develops customized HILIC methods for compounds with weak reversed-phase retention, complex polarity profiles, or poor chromatographic resolution, integrating column screening, mobile phase optimization, and orthogonal selectivity design.
Our HILIC-LC-MS workflows support sensitive detection of polar and ionic compounds while minimizing ion-pairing reagents that may compromise mass spectrometric response or instrument compatibility.
We use HILIC to resolve hydrophilic impurities, ionic degradation products, salts, counterions, and structurally similar polar components that may be poorly retained by reversed-phase LC methods.
HILIC provides orthogonal selectivity to reversed-phase, ion chromatography, and mixed-mode methods, helping clients confirm peak identity, improve separation confidence, and troubleshoot difficult analytical problems.
BOC Sciences helps pharmaceutical and biotechnology teams overcome weak retention, poor peak shape, matrix interference, and difficult impurity separation in highly polar analytical systems.
We evaluate multiple HILIC stationary phases to identify the most effective retention mechanism for each analyte class, including neutral hydrophilic compounds, acidic metabolites, basic APIs, zwitterions, and highly charged biomolecules.
Our scientists design volatile buffer systems, organic-rich gradients, and source-friendly conditions that preserve HILIC retention while enabling sensitive MS detection and confident molecular feature assignment.
HILIC methods are highly sensitive to water content and column equilibration. We carefully optimize starting organic ratio, gradient slope, re-equilibration volume, and injection solvent strength to improve repeatability.
We tailor extraction, dilution, solvent exchange, and protein precipitation strategies to maintain analyte solubility, minimize peak distortion, and reduce matrix effects in biological, synthetic, and formulation-related samples.
For targeted analytes, BOC Sciences establishes calibration strategies, internal standard selection, injection solvent evaluation, and response assessment to support reliable quantitation across complex concentration ranges.
We interpret HILIC retention patterns together with UV, CAD, ELSD, MS, and HRMS data to strengthen peak assignment, impurity differentiation, and analytical decision-making for complex development samples.
BOC Sciences provides HILIC testing for a broad range of hydrophilic, polar, and structurally complex compounds encountered in drug discovery, medicinal chemistry, analytical development, and formulation research. Our team selects HILIC conditions according to analyte polarity, ionization behavior, sample matrix, detection requirement, and project objective.
Submit your analyte list, sample matrix, current chromatogram, or unresolved peak issue. Our analytical scientists will design a practical HILIC strategy aligned with your sample properties and data goals.
We review analyte structures, polarity, pKa, expected ionization behavior, sample matrix, detection needs, and existing analytical data to determine whether HILIC alone or an orthogonal workflow is the most effective route.
Our team screens stationary phases, buffer systems, gradient programs, injection solvents, and detector settings to identify retention, selectivity, sensitivity, and peak shape conditions suitable for the target analytes.
We refine equilibration time, gradient slope, pH, buffer concentration, temperature, flow rate, and sample preparation variables, then evaluate resolution, repeatability, sensitivity, carryover, and matrix-related interference.
BOC Sciences provides chromatograms, method conditions, peak tables, MS or HRMS assignments when applicable, quantitative summaries, and practical recommendations for continued analytical use or further optimization.
Highly polar APIs, metabolites, and degradation products may elute near the void volume in reversed-phase methods, causing poor resolution and unreliable quantitation. BOC Sciences uses HILIC retention mechanisms to improve analyte retention, separate early-eluting components, and create orthogonal methods that deliver stronger chromatographic confidence for hydrophilic compounds.
HILIC methods can be sensitive to injection solvent strength, buffer solubility, water layer stability, and column equilibration. We systematically optimize solvent composition, equilibration volume, sample diluent, and gradient conditions to reduce peak tailing, peak splitting, and retention time variation in routine testing.
Biological samples, synthetic mixtures, and formulation matrices often contain co-eluting salts, excipients, and endogenous hydrophilic components. Our scientists combine selective sample preparation, HILIC-LC-MS analysis, and orthogonal detection strategies to distinguish target analytes from matrix-derived background signals.
Polar analogs, isobaric metabolites, positional isomers, and closely related process impurities can be difficult to resolve using a single separation mode. BOC Sciences uses column chemistry comparison, gradient selectivity tuning, and accurate mass confirmation to improve impurity differentiation and support confident analytical conclusions.
Collaborate with BOC Sciences to develop selective, practical, and data-rich HILIC workflows for polar APIs, metabolites, oligonucleotides, glycans, peptides, lipids, impurities, and formulation-related components.
Our analytical scientists understand the retention behavior of polar, hydrophilic, ionic, and zwitterionic compounds, allowing us to select HILIC conditions that address real separation problems rather than simply extending generic LC methods.
BOC Sciences combines HILIC with a broad analytical platform, enabling UV, MS, HRMS, and quantitative workflows to be matched with each project's sample type and data requirements.
Our analytical method optimization approach focuses on the variables that matter most in HILIC: equilibration, injection solvent, water content, buffer compatibility, matrix tolerance, and reproducible peak performance.
We deliver interpretable chromatograms, peak assignments, impurity summaries, and quantitative information that help project teams make confident decisions about compound quality, method suitability, and next-step analytical development.
Client Needs: A drug discovery team needed to measure a panel of highly polar nucleotide-related metabolites generated during early mechanism-of-action studies. Their reversed-phase LC method showed poor retention, severe co-elution, and unstable response for phosphorylated analytes.
Challenges: The target metabolites differed by small structural changes and charge states, while the sample matrix contained salts and endogenous polar components that suppressed MS response and shifted retention under poorly equilibrated HILIC conditions.
Solution: BOC Sciences screened six HILIC stationary phases, compared ammonium formate and ammonium acetate buffer systems, and optimized injection solvent composition to prevent peak distortion. We built a 22-minute HILIC-LC-MS/MS method, tested 48 matrix-matched injections, applied stable isotope internal standards, and adjusted equilibration volume to stabilize retention across the full metabolite panel.
Outcome: The final method separated the critical phosphorylated metabolites with consistent retention, reduced matrix interference, and generated quantitative data that helped the client compare compound-dependent metabolic pathway changes.
Client Needs: A biotechnology client required HILIC-based profiling for a modified antisense oligonucleotide containing multiple closely related shortmers, depurinated products, and polar synthetic impurities.
Challenges: The oligonucleotide impurities had similar mass ranges and overlapping ionization patterns. Reversed-phase ion-pair conditions produced broad peaks and complicated MS interpretation, while the client needed a cleaner orthogonal separation strategy.
Solution: We developed a HILIC-HRMS workflow using a zwitterionic stationary phase, volatile ammonium acetate buffer, controlled column temperature, and a shallow organic-to-aqueous gradient. The team evaluated 36 gradient/buffer combinations, acquired accurate mass data for major impurity clusters, and generated extracted ion chromatograms to differentiate length variants, depurination-related products, and hydrophilic synthesis byproducts.
Outcome: The optimized workflow improved separation of key oligonucleotide impurity classes, simplified mass-based assignment, and provided a clear impurity map for the client's continued process investigation.
Client Needs: A formulation research group needed reliable glycan profiling for a conjugated biomolecule sample where several neutral and acidic glycans showed overlapping peaks under an existing amide-HILIC method.
Challenges: The target glycans had subtle branching and sialylation differences, making resolution strongly dependent on stationary phase chemistry, gradient slope, sample cleanup, and fluorescence/MS response balance.
Solution: BOC Sciences compared amide and diol HILIC columns, optimized fluorescent labeling cleanup, and refined a shallow gradient window focused on late-eluting acidic glycans. We performed 30 replicate injections across three sample preparation conditions, integrated fluorescence detection with confirmatory MS acquisition, and adjusted buffer concentration to improve selectivity between sialylated glycan isomers.
Outcome: The refined HILIC method delivered sharper glycan peaks, improved isomer separation, and generated a reproducible profile suitable for comparing sample preparation lots and formulation conditions.
HILIC testing is especially suitable for highly polar, hydrophilic, or weakly retained compounds that show poor retention in conventional reversed-phase LC methods. Typical sample types include polar APIs, intermediates, degradants, excipients, nucleosides, nucleotides, oligonucleotides, glycans, glycopeptides, carbohydrates, metabolites, and other structurally related polar impurities. BOC Sciences evaluates each sample according to solubility, ionization behavior, matrix complexity, and expected analyte polarity, then selects appropriate HILIC stationary phases and mobile-phase systems to improve retention, separation selectivity, and MS compatibility.
HILIC is commonly selected when reversed-phase LC provides insufficient retention, early elution, poor peak shape, or limited resolution for polar analytes. Because HILIC retention can involve partitioning, adsorption, ion exchange, and other interactions, it can offer complementary selectivity for compounds that are difficult to resolve by C18-based methods. BOC Sciences often recommends HILIC as a standalone method or as an orthogonal strategy for polar impurity profiling, metabolite analysis, and confirmation of closely related hydrophilic species during drug development workflows.
Yes. HILIC is highly compatible with LC-MS analysis because it typically uses organic-rich mobile phases, which can support efficient desolvation and strong MS response for many polar analytes. This makes HILIC-LC-MS valuable for trace-level characterization, impurity identification, metabolite profiling, oligonucleotide analysis, and hydrophilic biomolecule studies. BOC Sciences develops HILIC-MS methods by optimizing column chemistry, buffer composition, gradient profile, injection solvent, and ionization mode to balance chromatographic resolution with reliable mass spectrometric detection.
BOC Sciences develops HILIC methods through a structured workflow that begins with analyte assessment, sample matrix review, and target separation objectives. Our scientists screen multiple HILIC stationary phases, evaluate mobile-phase composition, adjust buffer strength and pH where appropriate, and optimize gradient conditions to improve retention, peak shape, and resolution. For complex samples, we may combine UV, CAD, ELSD, or MS detection strategies. The final method is designed to provide practical, reproducible analytical insight for polar compounds and drug development samples.
Clients can expect a clear analytical package that may include optimized chromatographic conditions, representative chromatograms, peak assignment support, retention behavior interpretation, impurity or component profiling, and recommendations for further method refinement when needed. For LC-MS projects, BOC Sciences can also provide molecular weight confirmation, extracted ion chromatograms, and structural interpretation support for selected analytes. The goal is not only to generate data, but to help clients understand whether HILIC is the right analytical route for their compound class, matrix, and development objective.
Our polar metabolite panel was almost unusable by reversed-phase LC. BOC Sciences built a HILIC workflow that finally separated the critical components and gave our team interpretable quantitative data.
— Dr. Walsh, Director of Analytical Development
The team understood why our HILIC retention was drifting and quickly identified the equilibration and sample solvent issues. Their final method was much more practical for repeated project testing.
— Hardy, Senior Research Scientist
BOC Sciences combined HILIC separation with high-quality MS interpretation, which helped us distinguish real oligonucleotide impurities from background matrix signals. Their reporting was detailed and easy to act on.
— Dr. Newman, Project Lead, Nucleic Acid Therapeutics
We needed a partner who could handle polar, structurally similar glycans without turning the work into a generic LC screen. Their HILIC strategy was focused, scientific, and very effective.
— Holt, Principal Scientist, Bioconjugate Research
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