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ICH Q2 – the Challenge of Measuring Total Organic Carbon in Modern Pharmaceutical Water Systems <span style="color: #4d4d4d;">Total Organic Carbon (TOC) is one of the quality attributes defined in the European and USA pharmacopoeias for pharmaceutical waters</span><span style="color: #4d4d4d;">. Modern water treatment systems can deliver such high purity water that TOC levels can be consistently close to zero and very difficult to measure with any accuracy. This paper discusses some of the challenges when using TOC analysers to demonstrate pharmacopoeial TOC level compliance for modern water systems in the light of the ICH Q2 document</span><span style="color: #4d4d4d;">2</span><span style="color: #4d4d4d;">&nbsp;from the International Conference on Harmonisation.</span>
Temperature dependence of hydrodynamic radius of an intrinsically disordered protein measured in the Optima AUC analytical ultracentrifuge. Analytical ultracentrifugation experiments over a wide range of temperatures were conducted to measure the hydrodynamic radius of an intrinsically disordered protein. Taking advantage of the highly stable temperature control offered through the latest shroud modification available in the new Optima AUC, replicate experiments demonstrated highly reproducible hydrodynamic parameters that suggest slight changes in the hydrodynamic radius of an intrinsically disordered protein, and impressive performance in both temperature control and data quality from the Optima AUC.

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