Resistance of lipid films to oxygen transmission

Abstract

Various lipids, mounted on a polar filter paper matrix, were evaluated as barriers to O2 transmission Among those lipids tested, stearyl alcohol was most resistant to oxygen transmission, the most likely reason being its ability to crystallize as compactly overlapping platelets with their planes normal to the direction of O2 diffusion. Tristearin, beeswax, and acetylated monoglycerides were, respectively, 39, 43 and 61% less resistant to O2 transmission than the fatty alcohol. Activation energies of O2 transport were. 7.0, 7.5, 15.0 and 27.5 kcal/mole, respectively, for stearyl alcohol, tristearin, beeswax, and acetylated monoglycerides. Stearic acid was substantially less resistant to O2 flux than the above four lipids. In addition, the fatty acid was unique among the, lipids tested in its temperature dependence, i.e., resistance to O2 transmission increased with elevation of temperature yielding a negative activation energy of −17.2 kcal/mole. This was attributed to the presence of small interplatelet channels in the stearic acid film, which presumably act as the principal route for gas transport. Hexatriacontane displayed poor O2 barrier properties compared to the other lipids, a consequence of relatively large pores in the alkane film.

Quinoa protein–chitosan–sunflower oil edible film: Mechanical, barrier and structural properties

“…The OP values increased drastically with the addition of SO. Adding SO also increased the gas oxygen permeation up to 920e1500 times, probably due to a significant decrease in the crystalline spacing by matrix restructuring after the addition of lipids molecules, which generate channel sand pores in the network; this facilitates O 2 diffusion (Bertan, Fakhouri, Siani, & Grosso, 2005;Kester & Fennema, 1989) because the OP of edible films is attributable to capillary mechanisms (Morillon et al, 2002). Finally, the Q-8/CH/2.9SO blend film was chosen due to its good mechanical behaviour and its lower WVP relative to the hydrophilic films (Q-8/CH and CH).…”

Evaluation of Factors Affecting Barrier, Mechanical and Optical Properties of Pectin‐based Films Using Response Surface Methodology

“…The use of edible films and coatings has been extensively reviewed by Krochta and De Mulder‐Johnstone (1997), Debeaufort et al. (1998), Greener and Fennema (1989), Guilbert (1986), Kamper and Fennema (1984), Kester and Fennema (1986, 1989a,b). These articles provide information on the properties and uses of edible films, as well as formulations that work best for specific applications.…”

“…These articles provide information on the properties and uses of edible films, as well as formulations that work best for specific applications. Among the various edible films, a composite hydrocolloid‐lipid film is particularly desirable because it has acceptable structural integrity (imparted by the hydrocolloid) and good barrier properties to water vapor, contributed by the lipid (Kester and Fennema 1989a,b). …”

Fatty Acid Distribution and Its Effect on Oxygen Permeability in Laminated Edible Films

“…Since foods containing fat are susceptible to oxidation, oxygen barrier characteristics for protective films are important, and oxygen barrier properties for edible films have been investigated. Kester and Fennema (1989b, 1989c, 1989d) measured the degree of resistance of various lipid films to oxygen transmission and determined the influence of polymorphic form and tempering on oxygen transmission through lipid films. Oxygen permeability of bilayer films from methylcellulose and beeswax were measured by Greener and Fennema (1989).…”