If you're seeking a reliable reagent for maintaining sulfhydryl (SH) groups in their reduced state, consider Dithiothreitol. This compound is effective in quantitatively reducing disulfide bonds, making it ideal for applications such as preparing protein samples for SDS-PAGE. It's less pungent and less toxic compared to alternatives like 2-mercaptoethanol. https://www.astorscientific.us/products/dtt-1-4-dithiothreitol-as-d0505