Abstract
The batch-to-batch reproducibility of an endcapped trifunctional C18 bonded phase based on ethylene-bridged hybrid particles was assessed using a modified version of a chromatographic test developed by Neue and coworkers. The test involves the isocratic separation of six compounds chosen to probe different characteristics of the stationary phase, including hydrophobicity, hydrogen bonding and cation-exchange. The assessment was based on results for a total of 471 batches manufactured and tested over a 19 year time span. The results were compared to those for an endcapped monofunctional C18 bonded phase on silica particles, based on results generated for 246 batches over 29 years. Overall, both stationary phases show similar reproducibility, with relative standard deviations for the relative retentions ranging from 0.1 to 3.2 %.
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