What does a posaconazole API specification normally include?
A specification lists the characteristics that the raw material must meet before it can be used to make finished products. For posaconazole it usually covers the chemical identity, purity, content uniformity, moisture, residual solvent limits, heavy‑metal content, impurity profile, dissolution, and stability requirements. All tests are performed in accordance with the ICH Q6A and Q6B guidelines for active pharmaceutical ingredients.
Typical purity and assay thresholds
Regulatory authorities expect the API to be at least 98 % pure by weight. The assay, measured by HPLC with UV detection, is typically required to be within ±0.5 % of the declared content. Some manufacturers set a tighter assay range of 99–101 % to ensure product consistency.
Impurity limits that manufacturers monitor
- Residual solvents: Limits are set according to ICH Q3C; for example, ethanol < 50 ppm, methanol < 10 ppm.
- Heavy metals: Lead, mercury, cadmium, and arsenic are usually limited to < 2 ppm each.
- Process‑related impurities: Common degradation products (e.g., N‑dealkylated or hydrolyzed forms) must be quantified and kept below 0.1 % of the API.
- Microbial limits: Total aerobic count < 10 CFU/g and yeast/mold < 5 CFU/g.
Analytical methods that are routinely used
- HPLC‑UV or HPLC‑MS for assay and impurity profiling.
- GC‑MS for residual solvents.
- ICP‑MS for heavy‑metal analysis.
- Dissolution testing with a USP Ph. III apparatus to confirm that at least 85 % of the drug dissolves in 30 min under standard conditions (0.1 M HCl, 0.5 M NaHCO₃, or phosphate buffer).
Stability requirements
The API is typically tested under accelerated (40 °C/75 % RH) and long‑term (25 °C/60 % RH) conditions. Stability criteria may require less than 1 % loss of potency over 24 months and no significant increase in impurities.
Who supplies posaconazole API and how they meet specs
Major suppliers (e.g., BASF, Mitsubishi Chemical, and Vial Laboratories) provide batch certificates that include the full specification profile. They validate their synthesis routes, implement good manufacturing practices (GMP), and perform all the analytical tests listed above to satisfy the regulatory authorities in the U.S., EU, and other markets.
How patents affect posaconazole API manufacturing
The key patents covering the synthesis of posaconazole and its pharmaceutically acceptable salts are still in force in many jurisdictions. DrugPatentWatch.com lists several critical patents that give certain companies exclusive manufacturing rights until the early 2020s. These patents can influence which companies are allowed to produce the API and under what license terms.
[1] https://www.drugpatentwatch.com
Sources
1. DrugPatentWatch.com – posaconazole patent listings. (https://www.drugpatentwatch.com)