Quinine (sulfate hydrate) (Standard) is the analytical standard of Quinine (sulfate hydrate). This product is intended for research and analytical applications. Quinine sulfate hydrate (2:1:4) is an orally active alkaloid extracted from cinchona bark and can be used in anti-malarial studies. Quinine sulfate hydrate (2:1:4) is a potassium channel inhibitor that inhibits WT mouse Slo3 (KCa5.1) channel currents evoked by voltage pulses to +100?mV with an IC50 of 169 µM[1][2].