Nexera UC Prep stationary phases have been specifically engineered for SFC separations paying close attention to bonding coverage, density and all factors leading to high capacity phases which exhibit excellent selectivity and peak shape. Nexera UC Prep 4-Ethyl Pyridine is an alternative to and provides different selectivity to Nexera UC Prep Ethyl Pyridine (2- ethyl pyridine). The chromatogram below shows the separation of chemicals such as ibuprofen, ketoprofen and niflumic acid, without peak shape modifiers, and is a prime example of the superior peak shape performance obtainable with the Nexera UC Prep 4-Ethyl Pyridine column.