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Effect of Various Gelling Cations on the Physical Properties of “Wet” Alginate Films
Author(s) -
Harper B. Allison,
Barbut Shai,
Lim LoongTak,
Marcone Massimo F.
Publication year - 2014
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/1750-3841.12376
Subject(s) - ultimate tensile strength , elongation , divalent , chemical engineering , intrinsic viscosity , chemistry , sodium alginate , fourier transform infrared spectroscopy , viscosity , materials science , nuclear chemistry , polymer , composite material , organic chemistry , sodium , engineering
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 BaCl 2 (without added NaCl) had the highest ( P < 0.05) tensile strength and Young's modulus while films gelled with CaCl 2 (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+ .