P 6911 (OTTO) Poly(allylamine hydrochloride), average Mw ~15,000 Cas 71550-12-4 - used to make redox hydrogel-modified electrodes for measuring enzyme responses. Poly(allylamine hydrochloride) has many biomedical applications. The most prominent use of this polyelectrolyte is in the field of cell encapsulation. A layer by layer method is used by alternating positively and negatively charged polyelectrolytes to build a barrier between the cell and the harsher outside environment.