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.
Selecting a testing partner starts with knowing exactly what can be tested. For clients seeking reliable antioxidant and in vitro efficacy testing, it is essential to identify the specific parameters and standards that align with their product requirements. Our laboratory offers a range of testing capabilities to evaluate the antioxidant properties and biological activities of various materials, including pharmaceuticals, nutraceuticals, and industrial chemicals. By understanding the testing scope and required parameters, clients can ensure that their testing needs are met with precision and compliance to global standards.
Testing Scope
Our testing services cover a wide range of products, materials, grades, and application scenarios related to antioxidants and in vitro efficacy. The following are some examples:
- Products: Pharmaceutical compounds, dietary supplements, cosmetic ingredients, and industrial chemicals.
- Materials: Organic compounds, synthetic molecules, natural extracts, and blends.
- Grades: High-purity reference standards, active pharmaceutical ingredients (APIs), and commercial formulations.
- Application Scenarios: Antioxidant activity in food preservation, anti-aging treatments, and industrial process stability.
- Commonly Referenced Standards: ASTM D 2246, ISO 12163, EN 16528, and GB/T 15501.
Testing Items and Parameters
Our testing services include a comprehensive evaluation of antioxidant properties and in vitro efficacy. The following table outlines typical test items and parameters with graded limit requirements:
| Test Item | Typical Parameters | Graded Limit Requirements |
|---|---|---|
| Free Radical Scavenging Activity | DPPH, ABTS, ORAC, FRAP | IC50 values ranging from 10 μM to 1000 μM |
| Antioxidant Network Activity | LC-MS/MS analysis, HPLC quantification | Network score ≥ 80% for complex formulations |
| In Vitro Cytotoxicity | MTT assay, LDH release assay | IC50 > 50 μM for most pharmaceutical applications |
| Anti-inflammatory Activity | NO production assay, PGE2 assay | Inhibition rate ≥ 60% at 100 μM concentration |
| Antioxidant Stability | Shelf-life testing, degradation kinetics | ≥ 90% residual activity after 24 months storage |
Additional test parameters can be customized based on client requirements and specific application needs. Our laboratory ensures that all testing is conducted under strict quality control measures to maintain the highest level of accuracy and reproducibility.
Data and Variation Analysis
Assessment of parallel-sample and batch-to-batch variation is critical to ensure the reliability and consistency of test results. Our laboratory employs rigorous statistical methods to analyze data and report variations.
For parallel-sample variation, the relative deviation between replicate samples is calculated using the formula:
Relative Deviation (%) = [(Mean of Sample 1 - Mean of Sample 2) / Mean of Sample 1] × 100%
Typical acceptance windows for parallel-sample variation are within ±10% for most parameters. For batch-to-batch variation, the coefficient of variation (CV) is used to assess consistency:
CV (%) = (Standard Deviation / Mean) × 100%
Acceptance criteria for batch-to-batch variation vary by test item but generally fall within ±15% for most applications. All variation data is documented in the final report, providing clients with a clear understanding of the reproducibility and reliability of their test results.
By adhering to these standards and methodologies, our laboratory ensures that clients receive accurate, reliable, and meaningful data to support their product development and quality control processes.
For further assistance, clients are invited to confirm their required test items and sample information. We will revert with a formal quotation and expected schedule based on the provided details.