We published " Separation of nicotinamide metabolites using a PBr column packed with pentabromobenzyl group modified silica gel" in Analytical Biochemistry. 2022, 655, 114837.. https://doi.org/10.1016/j.ab.2022.114837 The following products were used in this study. COSMOSIL PBr Packed Column: https://www.nacalaiusa.com/...