Cellulose Cetylpyridinium chloride

In certain instances, enantioselectivity can be influenced by the addition of a second chiral additive such as alkylhydroxyalkyl cellulose [3,4], hexadecyltrimethyl ammonium bromide or cetylpyridinium chloride [3]. Extra additives, will not only introduce a different enantiomeric selectivity, but it will also increase the probability of the solute interacting with a chiral center and thus increase the selectivity. This... 

Gecol et al (2004) investigated the removal of As(V) from water by using flat sheet UF membranes and cetylpyridinium chloride (CPC) as cationic surfactant. In particular, regenerated cellulose (RC) membranes with a MWCO of 10 kDa and polyethersulfone (PES) membranes with MWCO of 5 and 10 kDa were used. When membranes were used without surfactant micelles PES membranes exhibited a lower As removal than RC membranes. This was attributed to the negatively charged surface of RC membranes and, consequently, to a Donnan exclusion mechanism. However, in both cases the As concentration in the permeate stream was higher than the MCL of 10 p.g. The addition of CPC (10 mM) reduced the As concentration in the permeate of all tested membranes well below the MCL. 

In the present study, hydrophobic interaction between hydroxypropylcellulose (HPC) and an ionic surfactant in an aqueous phase was discussed. HPC, as well as EHEC, is a nonionic cellulose ether which contains hydrophobic groups in its molecular structure. Therefore, it might be interesting to compare the complex-formation properties of HPC with that of EHEC. The surfactants used here were an anionic surfactant SDS and a cationic one cetylpyridinium chloride (CPC). HPC formed a complex with these surfactants, of which cloud point changed with the surfactant concentration in the same manner as that observed in the EHEC-surfactant systems [4]. Effects of the complex on stability of dilute and concentrated kaoiinite suspensions were also studied, taking physicochemical properties of the complex into account. 

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