Effects of nano‐tio₂ on the performance of high‐amylose starch based antibacterial films

Abstract

The purpose of this article is to investigate the effects of nano-tianium dioxide (nano-TiO 2 ) on the high-amylose starch/ polyvingl alcohol (PVA) blend films prepared by a solution casting method. The results show that at the concentration of 0.6% of nano-TiO 2 , the film demonstrated the best tensile strength at 9.53 MPa, and the elongation at break was noted as 49.50%. The optical transmittance of the film was decreased and the water resistance was improved with further increase of the concentration of nano-TiO 2 . Using the techniques of Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and fieldemission scanning electron microscopy (SEM), the molecular and the crystal structures of the films were characterized. The results indicate that the miscibility and compatibility between high-amylose starch and PVA were increased with the addition of nano-TiO 2 into the films due to the formation of hydrogen and CAOATi bonds. The antimicrobial activities of the blend films were also explored. The results show that there were inhibitory zones around the circular film disc, which is attributable to the addition of nano-TiO 2 .

Effect of gelatin/agar bilayer film incorporated with TiO2 nanoparticles as a UV absorbent on fish oil photooxidation

“…This drastic reduction in transmittance values might be due to the photocatalytic properties of these nanoparticles and thereby their absorption of ultraviolet light. A similar result was observed by Liu et al (2015), concerning the addition of TiO 2 nanoparticles into high-amylase starch.…”

“…A similar result was observed by Liu et al . (), concerning the addition of TiO 2 nanoparticles into high‐amylase starch.…”

Physical, mechanical, and antibacterial characteristics of bio‐nanocomposite films loaded with Ag‐modified SiO2 and TiO2 nanoparticles

“…TS values of films loaded with TiO 2 NPs increased form 4.3 MPa to 7.0 MPa corresponding to 31% and 114% increase compared to pure starch film, respectively. These results could be described by the evidence that addition of SiO 2 and TiO 2 NPs into starch matrix would efficiently boost the interfacial interactions within starch matrix by evolving H–H and C–O–Ti/Si covalent bonds between NPs and starch molecules (C. Liu, Xiong, Chen, Lin, & Tu, 2015). This would improve starch network rigidity leading to stronger films (Oleyaei et al., 2016).…”

Effects of Triclosan Contents on Antimicrobial Efficacy of Environmentally-friendly Biodegradable Polylactic Acid Composite Films

“…A small amount of cology is scratched from the bacteria dish, and is then added to a culture tube in order to formulate lysate with a concentration of 5 x 10 8 . Afterwards, 1 μL of lysate is smeared over the agar in a culture dish.…”

“…In addition to basic protection of the content, films are also expected to have multiple functions to be qualified for active packaging that can prolong the shelf life of foods and ensure their quality [6,7]. For example, antimicrobial films kill microorganisms and thus protect foods from rot and extend their expiry date [8]. In order to satisfy market demands and make the composite films commercially viable, this study combines environmentally protective PLA and antibacterial Triclosan agent in different ratios to form PLA/Triclosan composite films using a casting method.…”