quaternary ammonium derivative

quaternary ammonium derivative

a substance whose chemical structure has four carbon groups attached to a positively charged nitrogen atom. When the quaternary ammonium ion has more than about 16 carbon atoms, it is usually a strong emulsifying agent, highly water soluble but relatively insoluble in lipids.
Mentioned in ?
References in periodicals archive ?
As a quaternary ammonium derivative of atropine, ipratropium is fully ionized and does not distribute well across lipid membranes, limiting its distribution more to the lung when inhaled.

Full browser ?