Potency Testing
This test measures the concentration of the active ingredient at a specific point in time.

Stability Studies
A stability study measures the extent to which a product retains, within specified limits, and throughout its period of storage and use, the same properties and characteristics that it possessed at the time of compounding.

A study commonly includes: a stability indicating method assay, sterility (for sterile preparations), endotoxin (for most sterile preparations), pH, visual inspection, particulate matter, preservative effectiveness, preservative quantification, microbial limits (for non-sterile preparations), and the absence of specified organisms (for non-sterile preparations).

Compendia Testing
USP, EP, BP and JP compendial testing qualifies drug substances and excipients as well as drug products to meet pharmacopeia specifications. Testing consists of procedures and acceptance criteria that help ensure the identity, strength, quality, and purity of the article

Method Development and Validation
Celltechgen has extensive experience in analytical method development/validation for a variety of drug substances and products.

Our laboratory validates analytical methods based on ICH and USP guidelines and high-quality industry practices. Method parameters may include: precision, limit of detection, limit of quantitation, accuracy, linear range, specificity, robustness, system suitability, ruggedness and freeze-thaw.

Dissolution
Quality tests to ensure proper performance of the formulation, generally solid oral dose forms such as tablets and capsules.

Compatibility Studies
Compatibility testing is performed to ensure that the mixing of two different formulations does not impact the physical or chemical properties of the drugs.

PK/PD Studies
A PK/PD study analyzes the rate and extent of absorption of the active ingredient or moiety and emphasizes the use of pharmacokinetic endpoints in an accessible biological matrix, such as blood, plasma, and/or serum, to indicate release of the drug substance from the drug product into the systemic circulation.

Pre-Clinical and Clinical Analytical Testing
Celltechgen has extensive experience with chemical, manufacturing and controls testing for original and abbreviated new drug applications. This testing includes: identification tests, quantitative tests for impurities content, limit tests for the control of impurities, performance tests such as dissolution, and quantitative tests of the active moiety in samples of drug substance or drug product or other selected component(s) in the drug product.

Water Activity
Water activity refers to the water in a drug product freely available to participate in reactions such as hydrolysis or provide an environment that supports microbiological growth.

Water activity is measured by calculating the vapor pressure of water in the test sample relative to the vapor pressure of pure water at the same temperature. CTG’s water activity instrument uses a chilled dew point sensor to measure water activity with ± 0.003 accuracy.