11. The standard intermediates are anionic , cationic, and carbenoid. 12. SMARTS can be used to encode pharmacophore elements such as anionic centers. 13. The first anionic exchanger replaces the anions in solution with hydroxide ions. 14. The second cationic and anionic exchangers further reduce ion levels in solution. 15. MBAS assay is an ASTM International standard technique for detecting anionic surfactants. 16. They are prepared by treating anionic complexes with carbon disulfide. 17. Catalysis by anionic catalysts is also called asymmetric counteranion-directed catalysis. 18. Cationic starch increases strength because it binds to the anionic paper fibers. 19. These can be anionic , cationic or non-ionic in nature. 20. Mixtures of cationic and anionic surfactants form insoluble salts and are not useful.
