title: Preparation of starch-stabilized silver nanoparticles from amylose-sodium palmitate inclusion complexes.
abstract: Starch-stabilized silver nanoparticles (AgNP) were prepared from amylose-sodium palmitate helical inclusion complexes by first converting sodium palmitate within the amylose helix to silver palmitate by an ion-exchange reaction with silver nitrate, and then reducing the complexed silver palmitate salt with NaBH(4). This process yielded stable aqueous solutions that could be dried and then re-dispersed in water for end-use applications. Reaction products were characterized by inductively coupled plasma-atomic emission spectroscopy (ICP-AES), UV-VIS spectroscopy, X-ray diffraction, TEM, SEM and light microscopy. Addition of acid to reduce the pH of aqueous starch-AgNP solutions produced an increase in viscosity, and nearly quantitative precipitation of starch-AgNP was observed at low pH. Smaller AgNP and higher conversions of silver nitrate to water-soluble starch-AgNP were obtained in this process, as compared with a process carried out under similar conditions using a commercial soluble starch as a stabilizer.
authors.affiliation: Plant Polymer, National Center for Agricultural Utilization Research, USDA/ARS, 1815 N. University St., Peoria, IL 61604, United States.
authors.forename: George F
authors.initials: GF
authors.lastname: Fanta
authors.forename: James A
authors.initials: JA
authors.lastname: Kenar
authors.forename: Frederick C
authors.initials: FC
authors.lastname: Felker
authors.forename: Jeffrey A
authors.initials: JA
authors.lastname: Byars
mesh_terms: D000688:Amylose / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D019308:Palmitic Acid / Q000737:chemistry; D012834:Silver / Q000737:chemistry*; D013213:Starch / Q000138:chemical synthesis / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D019308:Palmitic Acid; D012834:Silver; D013213:Starch; D000688:Amylose