SCIEX Intabio ZT Capillary Electrophoresis System
| Brand | SCIEX |
|---|---|
| Origin | USA |
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | Intabio ZT System |
| Instrument Type | Capillary Isoelectric Focusing (cIEF) System |
| Application Focus | Charge Variant Analysis of Monoclonal Antibodies (mAbs) and Therapeutic Proteins |
| pI Resolution | ≤ 0.02 units |
| pI Range Options | 7.3–9.1 (standard ampholyte range) |
| Detection | UV-Vis (280 nm), coupled with offline or online MS integration capability |
| Data Output | Deconvoluted mass spectra aligned to individual cIEF peaks |
Overview
The SCIEX Intabio ZT Capillary Electrophoresis System is an automated, high-resolution capillary isoelectric focusing (cIEF) platform engineered for rigorous charge variant analysis (CVA) of monoclonal antibodies (mAbs), fusion proteins, and other therapeutic biologics. Unlike conventional slab-gel IEF or zone electrophoresis, the Intabio ZT leverages microfluidic capillary geometry and precise ampholyte-mediated pH gradient formation to achieve reproducible, quantitative separation based on intrinsic isoelectric point (pI). The system operates under controlled temperature and voltage ramping protocols to minimize protein migration artifacts and ensure robust pI calibration across runs. Its primary analytical objective is the identification and quantification of critical quality attributes (CQAs) that directly impact stability, efficacy, and immunogenicity—including deamidation, C-terminal lysine clipping, sialylation, mannose-type glycosylation, and glycation. With demonstrated resolution of pI differences as small as 0.02 units, the Intabio ZT meets the stringent demands of comparability studies, biosimilarity assessments, and regulatory submissions under ICH Q5E and Q5A guidelines.
Key Features
- Automated cIEF workflow from sample loading to data export—reducing manual handling and inter-operator variability
- Integrated UV detection at 280 nm with real-time peak tracking and baseline correction algorithms
- Pre-optimized, narrow-range ampholyte kits (e.g., pI 7.3–9.1) for high-fidelity mAb charge variant profiling
- On-instrument pI calibration using internal pI markers co-migrating with analytes
- Native compatibility with downstream mass spectrometry: seamless fraction collection for offline LC-MS/MS or direct coupling via SCIEX’s cIEF-MS interface modules
- Compliance-ready architecture supporting audit trails, electronic signatures, and user access controls per FDA 21 CFR Part 11 requirements
Sample Compatibility & Compliance
The Intabio ZT accommodates purified IgG1/IgG4 mAbs, antibody–drug conjugates (ADCs), Fc-fusion proteins, and recombinant enzymes in standard formulation buffers (e.g., PBS, histidine, acetate). Sample volumes range from 1–10 µL at concentrations ≥ 0.5 mg/mL. No derivatization or labeling is required. All separations are performed under non-denaturing conditions to preserve native charge states and post-translational modifications (PTMs). The system conforms to ISO/IEC 17025 method validation principles and supports GLP/GMP-aligned documentation packages. It is routinely employed in laboratories conducting stability-indicating assays compliant with USP , ICH Q5E, and EMA CHMP/BWP/33256/2012 guidance on charge heterogeneity characterization.
Software & Data Management
Control and analysis are executed via SCIEX OS software v2.4 or later—a validated platform offering full traceability, version-controlled method storage, and automated report generation. Chromatograms and electropherograms are annotated with calibrated pI values, relative peak area %, and mobility-based retention time alignment. Integrated deconvolution tools process raw MS spectra collected per cIEF fraction, enabling confident assignment of PTM-specific mass shifts (e.g., +0.984 Da for deamidation, −42.011 Da for lysine removal). Data files adhere to mzML and .wiff standards, ensuring interoperability with third-party bioinformatics suites such as BioPharma Finder™ and Byos™. Audit logs record all parameter changes, user actions, and instrument events with timestamped digital signatures.
Applications
- Comparability assessment across manufacturing process changes (cell line, purification, formulation)
- Forced degradation study monitoring of acid/base-induced deamidation and oxidation
- Lot-to-lot consistency evaluation during commercial release testing
- Supporting regulatory filings for BLA, MAA, and variation applications requiring CQA mapping
- Root cause investigation of potency loss or aggregation onset linked to charge-driven conformational instability
FAQ
Can the Intabio ZT be used for intact mass analysis of charge variants?
No—the system performs cIEF separation only; intact mass determination requires offline or online coupling to a high-resolution mass spectrometer.
Is pI calibration required before every run?
Yes, internal pI standards are injected with each sample batch to maintain inter-run accuracy and meet ICH Q5E calibration frequency recommendations.
Does the system support multi-attribute monitoring (MAM) workflows?
Yes—when integrated with SCIEX TripleTOF® or X500B systems, the Intabio ZT enables concurrent quantification of charge variants, glycoforms, and sequence variants within a single analytical framework.
What buffer systems are compatible with the capillaries?
Only SCIEX-certified cIEF ampholytes and carrier ampholyte additives are validated for use; non-approved buffers may compromise resolution, capillary lifetime, or regulatory compliance.
How is system suitability verified?
Via resolution (Rs ≥ 1.5 between adjacent peaks), pI repeatability (RSD ≤ 0.02 units), and UV peak area precision (RSD ≤ 5%) using NIST-traceable mAb reference standards.
