Effect of TiO2 nanoparticles on the physico-mechanical and ultraviolet light barrier properties of fish gelatin/agar bilayer film

Abstract

a b s t r a c tBilayer gelatin/agar films containing different concentrations of TiO 2 (0.5, 1, and 2 g/100 g) were prepared by incorporation of anatase titanium dioxide nanoparticles in the fish gelatin layer of the bilayers. Gelatin/agar bilayer film was produced from the monolayers using the casting method in two steps and their microstructural, physical, mechanical and optical characteristics were studied. Results showed that the addition of TiO 2 decreased water vapor permeability of the bilayers more than 30%, upon increasing TiO 2 content to 2 (g/100 g). However, swelling ratio and moisture content increased with the increase in the nano-TiO 2 content, probably due to the hydrophilic nature of the TiO 2 nanoparticles. The tensile strength of the bilayer films increased from 10.80 to 13.91 MPa upon increasing nano-TiO 2 content from 0 to 0.5 (g/100 g); however, tensile strength decreased with further increase of the nanoparticle concentration. In addition, the metallic nature of nano-TiO 2 considerably improved the barrier properties of the bilayer films against UV light at low concentration, while it increased their opacity. This property might help in the preservation of light-sensitive foods, but more studies on real food systems are required.

Impact of nano/micron vegetable carbon black on mechanical, barrier and anti‐photooxidation properties of fish gelatin film

“…In addition, from the transmittance curves in the UV region (200–400 nm), it indicated a very low transmittance of UV light for the fish gelatin films incorporated with the VCB, especially with the nano VCB, when compared to the pure gelatin film. This result revealed that VCB tended to absorb UV light because short‐wave light (UV light) has more energy than long‐wave light (visible light) . These results coincided with those previously reported about the addition of carbon black to plastic as an ultraviolet stabiliser .…”

Biodegradable polymer films from seaweed polysaccharides: A review on cellulose as a reinforcement material

“…[67] garlic oil, show higher antibacterial activity (Table 4). The antimicrobial properties of essential oils and their generally recognized-as-safe regulatory status have attracted much interest for their incorporation in edible films [52].…”

Physico‐mechanical, thermal, and ultraviolet light barrier properties of collagen hydrolysate films from leather solid wastes incorporated with nano TiO2

“…This behavior suggests that NPs create a tortuous path for the water molecules diffusion and increasing cohesion of polymer matrix by filling free volume spaces . Reduced film WVP was observed in previous researches on the incorporation of nanoscale hydroxyapatite and TiO 2 into gelatin‐based films, respectively …”

“…Film thickness of the resulting films did not show significance difference by the incorporation of TiO 2 NPs ( P > 0.05). This can be attributed to the small diameter of the obtained NPs …”