Description_x000D_ Application_x000D_ 1-Methyluric acid has been used:_x000D_ • for the determination of uric acid in stool samples by liquid chromatography and tandem mass spectrometry_x000D_ • in turbidimetric assay of synthetic urine samples_x000D_ • as a substrate for CYP1A2(cytochrome P450 family 1 subfamily A member 2) assay_x000D_ Packaging_x000D_ 50, 100 mg in poly bottle_x000D_ Biochem/physiol Actions_x000D_ 1-Methyluric acid (1-U) is a major metabolite of caffeine and theophylline with antioxidant activity that protects molecules such as low density lipoproteins (LDL) from oxidative modifications. 1-Methyluric acid may be used in studies aimed at differentiating the activities of caffeine and theophylline metabolites._x000D_ Packaging_x000D_ Bottomless glass bottle. Contents are inside inserted fused cone._x000D_ Other Notes_x000D_ Tandem Mass Spectrometry data independently generated by Scripps Center for Metabolomics is available to view or download in PDF. M6885.pdf Tested metabolites are featured on Scripps Center for Metabolomics METLIN Metabolite Database. To learn more, visit sigma.com/metlin.