title: Physico-chemical studies and emulsifying properties of N-propyl-N-methylene phosphonic chitosan.
abstract: Chitosan is a modified, natural carbohydrate polymer derived by deacetylation of chitin. Due to the presence of two functional groups can undergo many chemical modifications. In a previous work we described the synthetic strategy and characterization of a novel soluble derivative: N-propyl-N-methylene phosphonic chitosan (PNMPC). In the study of some physicochemical properties, results showed that this modified chitosan aggregates in several steps when the concentration is increased. By addition of NaOH the initially coiled molecules stretch exposing more phosphonic acid groups to neutralization and finally give a cooperative reaction with OH((). PNMPC has emulsifying properties and gives O/W emulsions with quasi-monodisperse small droplets. Emulsions with 0.18% PNMPC and 30:70 o:w ratio exhibited the best emulsifying properties within the test range. This emulsion ratio showed high stability to long time storage and several successive freeze/thaw and heating/cooling cycles.
authors: Instituto de Química (INQUISUR), Universidad Nacional del Sur-CONICET, Av. Alem 1253, B8000CPB Bahía Blanca, Argentina. alberten@criba.edu.ar
authors: Liliana
authors: L
authors: Albertengo
authors: Sonia
authors: S
authors: Farenzena
authors: Adriana
authors: A
authors: Debbaudt
authors: Adriana
authors: A
authors: Zuñiga
authors: Pablo
authors: P
authors: Schulz
authors: Maria Susana
authors: MS
authors: Rodriguez
mesh_terms: D055598:Chemical Phenomena; D048271:Chitosan / Q000031:analogs & derivatives* / Q000737:chemistry*; D003358:Cosmetics; D045703:Emulsifying Agents / Q000737:chemistry*; D005511:Food Handling; D010757:Phosphorous Acids / Q000737:chemistry*; D010938:Plant Oils / Q000737:chemistry; D000074242:Sunflower Oil
chemical_list: D003358:Cosmetics; D045703:Emulsifying Agents; D010757:Phosphorous Acids; D010938:Plant Oils; D000074242:Sunflower Oil; D048271:Chitosan