Reasons for choosing our testing services
ZHONGXI Testing has obtained inspection qualification certifications from multiple countries and regions worldwide. We possess a senior testing team and advanced testing methods, providing independent, impartial, and professional third-party verification services for global carbon projects.
Internationally recognized authority
Certified by multiple international standards such as CNAS, VCS, and GS, with reports universally applicable worldwide.
Global service capability
Covering 140+ countries and regions, it supports on-site detection and remote verification in multiple languages.
Professional experimental methods
Adopt standard experimental methods to ensure accurate and reliable data.
For procurement and quality teams in the pharmaceutical and biotechnology sectors, a clearly defined testing scope is essential to ensure efficient and effective collaboration. At our CNAS/CMA-accredited laboratory, we specialize in cell interferon testing, offering standardized and reliable services to meet international quality standards. By understanding your specific testing requirements—such as product type, material grade, application scenario, and referenced standards (ASTM, ISO, EN, GB)—we can provide tailored solutions that align with your regulatory and performance expectations. This page outlines our testing capabilities, parameters, and data analysis methodologies to facilitate a streamlined testing process.
Testing Scope
Our cell interferon testing services cover a wide range of product categories, including recombinant and natural interferons, used in therapeutic and diagnostic applications. The scope applies to interferon proteins in various formulations, such as lyophilized powders, liquid suspensions, and conjugated formulations. Material grades vary from clinical-grade to research-grade interferons, with testing tailored to meet industry-specific requirements. Common application scenarios include antiviral treatments, autoimmune diseases, and cancer therapies. The following standards are frequently referenced during testing:
- ISO 15378: Biologicals for human use — Interferons
- ASTM F1788: Standard Test Method for Interferon Activity
- EN 13606: Biologicals in vitro—Measurement of the biological activity of interferon alpha and interferon gamma using a cytopathic effect (CPE) assay
- GB/T 20944: Recombinant human interferon alpha
Testing Items and Parameters
We conduct a comprehensive suite of tests to evaluate the biological activity, purity, and stability of cell interferon products. Typical test items include:
- Biological activity determination (using standardized cell-based assays)
- Purity assessment (HPLC, SDS-PAGE, and electrophoresis)
- Endotoxins and pyrogens testing
- Identity confirmation (peptide mapping, mass spectrometry)
- Stability testing (accelerated and long-term)
Below is a table summarizing typical parameters and graded limit requirements for biological activity assays:
| Test Item | Typical Parameters | Graded Limit Requirements |
|---|---|---|
| Interferon Activity (IU/mL) | Range: 1x10³ to 1x10⁹ IU/mL | ±15% of declared activity for ≥80% potency |
| Purity (HPLC) | ≥95% (main peak area) | ±5% for bulk drug; ±3% for final product |
| Endotoxins (EU/mL) | ≤0.25 EU/mL | Compliance with ISO 15378 limits |
Data and Variation Analysis
Our testing methodology incorporates rigorous parallel-sample and batch-to-batch variation analysis to ensure reproducibility and consistency. For each test item, at least two parallel samples are analyzed to determine relative deviation, typically within ±10% for biological activity and ±5% for purity metrics. Batch-to-batch variation is assessed using statistical process control, with acceptance windows defined based on historical data and regulatory guidelines. For example, interferon activity may exhibit a typical acceptance window of ±12% across consecutive batches, while purity remains within ±4%. All variations are documented in the report, accompanied by confidence intervals and statistical significance (p-value <0.05). This approach ensures that results meet stringent industry standards and regulatory requirements.
Send us your testing item list and sample details, and our engineers will confirm the applicable items and turnaround within one working day.