Preparation and Antifoaming Properties of Long Chain Fatty Acid Methyl Esters

A fiber-optic pH sensor based on polyelectrolyte multilayers embedded with gold nanoparticles

“…where n is an empirical parameter. The curve is a close fit to the data points with a pKa value of 7.44 which is higher than the commonly reported values of chitosan in solution form [30,35]. This is similarly observed for other PEM systems and attributed to the energetically favorable ionic pairing in a PEM that makes polyacid more difficult to deprotonate, hence the higher basicity [36].…”

“…It is the only pseudo natural cationic polymer and is a material of immense research interest due to its biocompatibility, biodegradability, film forming [26], anti-bacterial [27] and chelating properties and the ease of modification of the amino group at the C2 position which allows the design of polymers for use in diverse fields ranging from the pharmaceutical [28] and food industries to waste water treatment [29], etc. Owing to the protonation of the amino functional group on the C2 position in acidic medium, chitosan is a weak cationic polyelectrolyte with an apparent dissociation constant, pKa value of ∼6.2 in water [30].…”