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.
A well-defined testing scope is the first sign of a competent laboratory. Our nisin detection services are designed to meet the rigorous demands of the food industry, ensuring that products meet safety and quality benchmarks. We leverage advanced analytical techniques to provide accurate and reliable results for clients seeking to validate the presence and concentration of nisin in their products.
Testing Scope
Our nisin detection services cover a wide range of products, materials, and application scenarios. We test for nisin in food and food-related products, including dairy products, meat products, processed foods, and beverage formulations. The testing scope encompasses various grades of nisin, such as food-grade nisin solutions and natural nisin isolates, to ensure versatility across different industries.
Application scenarios include quality control, regulatory compliance, and research and development purposes. Our testing is commonly referenced against international standards such as ISO 22300 (Food Additives - Nisin), ASTM E2257 (Standard Test Method for Determination of Nisin in Foods), and EN 1442 (Microbial Food Preservatives - Nisin).
Testing Items and Parameters
Our testing items and parameters are carefully selected to provide comprehensive analysis of nisin in various matrices. The primary test item is the quantitative determination of nisin concentration, typically expressed in units of activity (IU/g or IU/mL). Additional parameters may include the assessment of nisin stability, efficacy against specific pathogens, and purity analysis.
The following table provides a typical parameter list for nisin detection:
| Parameter | Typical Range | Graded Limit Requirement |
|---|---|---|
| Nisin Concentration (IU/g) | 0.1 - 1000 IU/g | ±10% for concentrations >10 IU/g, ±15% for concentrations ≤10 IU/g |
| Nisin Stability (at 37°C, 7 days) | ≥85% retention of initial activity | Must meet regulatory minimums specified in ISO 22300 |
| Efficacy Against Listeria monocytogenes | Minimum inhibitory concentration (MIC) ≤ 0.1 IU/mL | Compliance with FDA or EFSA guidelines |
Other test items may include residual solvent analysis, heavy metal contamination checks, and microbiological assays to ensure the overall quality and safety of the nisin product. Our methodologies are validated to meet the highest standards of accuracy and precision.
Data and Variation Analysis
Parallel-sample and batch-to-batch variation are rigorously assessed to ensure consistency and reliability in nisin detection results. For parallel-sample analysis, we compute the relative deviation between replicate samples to quantify variability. Typically, the relative deviation for nisin concentration is maintained within ±5% for most applications, with stricter limits of ±2% for high-purity standards.
Batch-to-batch variation is evaluated by comparing results from consecutive production batches or different suppliers. Acceptance windows are established based on historical data and regulatory guidelines, ensuring that products consistently meet specified requirements. For example, a typical acceptance window for nisin concentration may be set within ±8% of the declared value, subject to adjustments based on product sensitivity and regulatory demands.
The analysis is documented in detailed reports, including statistical summaries of variation metrics and graphical representations of data trends. This approach ensures transparency and provides clients with the confidence needed to make informed decisions about their products.
Clients are welcome to share drawings, material grades, or purchase specifications so that the testing plan can be matched precisely to their requirements. Our team is ready to assist with tailored solutions to meet your specific needs.