RT Journal Article
SR Electronic
T1 Implementation of a High-Throughput Ion Chromatographic Assay To Assess Glass Degradation in Drug Product Formulations
JF PDA Journal of Pharmaceutical Science and Technology
JO PDA J Pharm Sci Technol
FD Parenteral Drug Association (PDA)
SP 96
OP 107
DO 10.5731/pdajpst.2015.01007
VO 69
IS 1
A1 Renuka Thirumangalathu
A1 Kwun Ngok Wong
A1 James Coultas
A1 Alison Hair
A1 Deirdre Murphy Piedmonte
YR 2015
UL http://journal.pda.org/content/69/1/96.abstract
AB The primary container for parenterals is usually composed of glass. Given the recent industry-wide spike in glass-related problems, assays capable of detecting glass degradation before glass-related particles are visible in solution have practical significance. A rapid, high-throughput ion chromatography method coupled with molybdate reaction is described here for detection and quantitation of silicic acid (soluble form of silica) in complex samples. The method involves ion exchange separation of the silicate anion at high pH followed by a post-column derivatization step with sodium molybdate reagent. The resulting molybdo-silicate complex is detected with high sensitivity in the visible wavelength range at 410 nm and correlates to the level of soluble silica in solution. This assay is high-throughput and amenable for implementation during the early phase of product development. The assay provides a direct measurement to assess potential incompatibility between the formulation and its glass container. The Si levels measured by this method showed a direct correlation to the vial surface morphology changes as monitored by differential interference contrast microscopy. LAY ABSTRACT: Recently, the pharmaceutical industry has been faced with glass quality challenges that have resulted in many products being recalled from the market. Monitoring levels of soluble silica in solution is critical because silica is the primary component of glass containers used in the pharmaceutical industry. Given this recent industry-wide increase in glass-related problems, assays capable of detecting glass degradation before glass-related particles are visible in solution have practical significance. A rapid assay to detect the soluble form of silica is presented here. The method presented will enable earlier detection of a formulation and container incompatibility instead of waiting until glass-related particles are visible in solution.