Analytical Sciences

Validation of a Stability-indicating RP-LC Method for the Assessment of Recombinant Human Interleukin-11 and Its Correlation with Bioassay

Ricardo Bizogne SOUTO,* Fernanda Pavani STAMM,* Maria Teresa de Carvalho Pinto RIBELA,** Paolo BARTOLINI,** Guilherme Zanini CALEGARI,* and Sérgio Luiz DALMORA*

*Department of Industrial Pharmacy, Federal University of Santa Maria, 97105-900 Santa Maria-RS, Brazil
**Biotechnology Department, IPEN-CNEN, Cidade Universitária, 05508-900 São Paulo-SP, Brazil

A stability-indicating reversed-phase liquid chromatography (RP-LC) method was validated for the assessment of recombinant human interleukin-11 (rhIL-11), based on the ICH guidelines. The method was carried out on a Jupiter C₄ column (250 mm × 4.6 mm i.d.), maintained at 25°C. The mobile phase A consisted of 0.1% trifluoroacetic acid (TFA) and the mobile phase B was acetonitrile with 0.1% TFA, run at a flow rate of 1 mL/min, and using a photodiode array (PDA) detection at 214 nm. Separation was obtained with a retention time of 27.6 min, and was linear over the concentration range of 1 – 200 μg/mL (r² = 0.9995). Specificity was established in degradation studies, which also showed that there was no interference of the excipients. The accuracy was 100.22% with bias lower than 1.25%. Moreover, the in vitro cytotoxicity test of the degraded products showed non-significant differences (p > 0.05). The method was applied to the assessment of rhIL-11 and related proteins in biopharmaceutical dosage forms, and the results were correlated to those of a bioassay.

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