title: Effect of various gelling cations on the physical properties of "wet" alginate films.
abstract: In this study, the physical properties of "wet" alginate films gelled with various divalent cations (Ba(2+) , Ca(2+) , Mg(2+) , Sr(2+) , and Zn(2+) ) were explored. Additionally, the effect of adding NaCl to the alginate film-forming solution prior to gelling was evaluated. Aside from Mg(2+) , all of the divalent cations were able to produce workable "wet" alginate films. Films gelled with BaCl2 (without added NaCl) had the highest (P < 0.05) tensile strength and Young's modulus while films gelled with CaCl2 (alone) had the highest puncture strength. The Zn-alginate and Sr-alginate films had the highest elongation at break values. Adding NaCl to the alginate film-forming solution increased the viscosity of the solution. Films with added NaCl were less transparent and had lower tensile strength, elongation, and puncture strength than films formed without NaCl in the film-forming solution. ATR-FTIR results showed a slight shift in the asymmetric COO(-) vibrational peak of the alginate when the "wet" alginate films were gelled with Zn(2+) .
authors.affiliation: Dept. of Food Science Univ. of Guelph, 50 Stone Rd., Guelph, ON, Canada, N1G 2W1.
authors.forename: B Allison
authors.initials: BA
authors.lastname: Harper
authors.forename: Shai
authors.initials: S
authors.lastname: Barbut
authors.forename: Loong-Tak
authors.initials: LT
authors.lastname: Lim
authors.forename: Massimo F
authors.initials: MF
authors.lastname: Marcone
mesh_terms: D000464:Alginates / Q000737:chemistry*; D002412:Cations / Q000737:chemistry*; D018857:Food Packaging / Q000379:methods*; D005782:Gels / Q000737:chemistry; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D012965:Sodium Chloride / Q000737:chemistry*; D013314:Stress, Mechanical; D013718:Tensile Strength; D014131:Trace Elements / Q000737:chemistry; D014783:Viscosity
chemical_list: D000464:Alginates; D002412:Cations; D005782:Gels; D006603:Hexuronic Acids; D014131:Trace Elements; D012965:Sodium Chloride; D020723:Glucuronic Acid
keywords: Fourier transform infrared spectroscopy; alginate; cationic gelling agents; film; texture