Blockage of chloride channels by HEPES buffer

Abstract
Chloride channels of neurons of Drosophila are blocked when the cytoplasmic side of the membrane is exposed to the commonly used buffering agents 4-(2-hydroxyethyl)-1-piperazine ethanesulphonic acid (HEPES) and 4-morpholinepropanesulphonic acid (MOPS). In the presence of these compounds, chloride channels appear to function as a complex of multiple protochannels.