Sulphanilamide-d4 Hydrochloride (CAS 77435-46-2)

Sulphanilamide-d4 hydrochloride is a deuterium-labeled sulfonamide used primarily as an internal standard in analytical chemistry, particularly in mass spectrometry. The mechanism of action involves the inhibition of bacterial dihydropteroate synthase, an enzyme critical for the synthesis of folic acid in bacteria. This inhibition disrupts the production of folic acid, essential for DNA, RNA, and protein synthesis, thereby halting bacterial growth. In research, sulphanilamide-d4 hydrochloride is used to quantify sulphanilamide and related compounds in biological samples through mass spectrometry, leveraging its stable isotopic labeling to differentiate it from endogenous compounds. This allows for precise measurement and analysis of drug metabolism, pharmacokinetics, and the study of biochemical pathways involving sulfonamides. Additionally, sulphanilamide-d4 hydrochloride serves as a tool for studying the inhibition mechanisms of sulfonamide antibiotics. By investigating the interactions between sulphanilamide and dihydropteroate synthase, researchers can gain insights into the structure-activity relationships and resistance mechanisms of these antibiotics. These applications are crucial for advancing the understanding of antimicrobial action and the development of new strategies to combat bacterial resistance.