GLP Solutions for Purity Testing and Nanotesting of Pharmaceutical Products
The efficacy and safety of a pharmaceutical product depend directly on its degree of purity. The purer the active pharmaceutical ingredient (API) in a drug, the more predictable its therapeutic effect and the lower the risk of side effects. GLP purity testing for pharmaceutical products is the process of detecting, identifying, and quantifying undesirable impurities in an active ingredient or a drug.
Good Laboratory Practice (GLP) ensures that these tests are conducted reliably, reproducibly, and in accordance with standards recognized by international regulatory agencies (FDA, EMA, TİTCK). The purity test is not only a quality control step but also an integral part of the drug development process (R&D) and production validation.
The Importance and Scope of Purity Testing
The purity of pharmaceutical products is generally evaluated based on three main criteria:
- Chemical purity: This involves determining the total amount of organic and inorganic impurities (intermediates, byproducts, degradation products, heavy metals, and solvent residues) present in the product.
- Optical purity: This is important for chiral molecules. While only one specific enantiomer (mirror image) of a drug has a therapeutic effect, the other may be toxic. Enantiomeric purity is determined using chiral chromatography.
- Physical Purity: Evaluation of physical properties such as particulate impurities, color, clarity, and polymorphs.
Purity tests conducted in accordance with GLP demonstrate that the product meets the specifications (product quality standard). Regulatory authorities have established acceptance limits for each impurity. For example, the ICH guidelines Q3A and Q3B specify the reporting, definition, and qualification thresholds for impurities in new active pharmaceutical ingredients and products.
Analytical Methods for Purity Testing
Pharmaceutical purity analyses require a combination of high-resolution chromatographic techniques and spectroscopic methods. The method used depends on the structure of the molecule being analyzed and the expected impurity profile.
1. High-Performance Liquid Chromatography (HPLC)
HPLC is the most commonly used technique in pharmaceutical purity testing.
When combined with UV/VIS, DAD (diode array detector), or FLD (fluorescence detector), it enables the detection of both the main component and impurities at very low concentrations. Both reverse-phase (RP-HPLC) and normal-phase (NP-HPLC) modes can be used.
2. Gas Chromatography (GC)
Used for the analysis of volatile and semi-volatile organic contaminants (including solvent residues). The headspace-GC method is particularly effective for detecting volatile contaminants without matrix effects.
3. Methods combined with mass spectrometry (LC-MS/MS, GC-MS/MS)
They are essential for the identification and structural characterization of unknown contaminants. This method offers high sensitivity for the detection of genotoxic contaminants at low concentrations.
4. Chiral Chromatography (Chiral HPLC)
This is a method for separating enantiomers and determining their ratios using chiral columns to determine optical purity.
Parameters Evaluated in Purity Tests
The following table summarizes the basic parameters taken into account when evaluating the purity profile of a pharmaceutical product:
| Parameters | Explanation | Typical analytical method | Acceptance Criterion (Example) |
|---|---|---|---|
| Chemical contaminants | Organic byproducts, intermediates, degradation products | HPLC-DAD, LC-MS/MS | Total impurities ≤ 0.5% |
| Enantiomeric Purity | Proportion of the undesirable mirror-image isomer | Chiral HPLC | Unwanted enantiomer ≤ 0.1% |
| Solvent Residues | Organic solvents from the production process | Headspace-GC-FID | Compliance with ICH Q3C Threshold Values |
| Heavy Metals | Metals from catalyst residues or resulting from contamination | ICP-MS, AAS | Compliance with ICH Q3D Thresholds |
| Water content | Moisture content in the product | Karl Fischer titration | As specified (e.g., ≤ 0.5%) |
GLP-compliant purity testing services with Nano-Test
The purity profile of your pharmaceutical products not only directly affects your compliance with regulatory requirements but also influences how the quality of your brand is perceived. With its comprehensive purity testing, conducted in laboratories that are fully GLP-compliant, Nano-Test is a reliable solution partner for the pharmaceutical industry.
Description of Nano-Test Services
Nano-Test offers GLP-compliant purity testing for pharmaceutical products. Our service portfolio includes advanced analytical techniques such as HPLC-DAD/FLD, LC-MS/MS, GC-MS/MS, chiral HPLC, ICP-MS, and Karl Fischer titration.
Our analyses are performed using fully validated methods in accordance with the ICH Q2(R1) Validation Guideline. For each test, we prepare GLP compliance reports that can be defended during inspections by regulatory authorities (FDA, EMA, TİTCK) and ensure full traceability and data integrity (ALCOA+ principles). Whether it is an active pharmaceutical ingredient (API), an excipient, or a finished product, we document your purity profile in accordance with international standards.
At Nano-Test, our team of experts is here to assist you even with complex analyses, such as the structural characterization of unknown impurities and the evaluation of genotoxic impurities.
Benefits of Purity Analysis at Nano-Test:
- Comprehensive Analysis: One-stop management of chemical, optical, and physical purity parameters.
- Ultra-high sensitivity: Detection of even trace amounts of contaminants (ppm/ppb).
- Fast Reporting: Results are delivered within 5–10 business days for standard purity tests.
- Compliance with Regulatory Requirements: Full compliance with ICH Guidelines Q3A, Q3B, Q3C, and Q3D, as well as with the pharmacopoeia monographs.
- Identification of Unknown Contaminants: Structural Characterization Using HRMS and NMR.
The purity of a pharmaceutical product is directly linked to its safety and efficacy. GLP compliance in pharmaceutical purity testing ensures the scientific identification and quantification of all impurities present in your product, as well as verification of compliance with regulatory limits. Even the smallest error in this process can delay your product’s regulatory filing or increase the risk of a recall.
With its state-of-the-art analytical infrastructure, GLP-certified procedures, and team of experts, Nano-Test is a reliable partner for pharmaceutical purity testing. Have your purity analyses performed by Nano-Test to ensure your products gain seamless access to global markets.