Photocatalytic and antimicrobial activities of chitosan-TiO2 nanocomposite

Karthikeyan, K.; Nithya, A.; Jothivenkatachalam, Kandasamy

doi:10.1016/j.ijbiomac.2017.03.121

Cited by 144 publications

(58 citation statements)

References 50 publications

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“…Antibacterial activity of the chitosan-TiO 2 coating films against E. coli and S. aureus was determined using an Oxford cup method, with some modifications, as described by Li et al [34] and Karthikeyan et al [16]. In a bacteria-free environment, stainless steel tubes (6 mm inner diameter) were placed on a nutrient agar plate pre-spread with 100 µL of microbial cell suspension (10 6 -10 7 CFU/mL).…”

Section: Determination Of Inhibitory Zones Against E Coli and S Aureusmentioning

confidence: 99%

“…However, the bactericidal, moisturizing, mechanical and antioxidant properties of pure chitosan film have been thought unsatisfactory in practical applications [13,14]. To overcome these disadvantages, the inorganic nanoparticles (NPs) (such as silicon dioxide, zinc oxide and titanium dioxide (TiO 2 )) [15][16][17] were added during film formation, to form chitosan-based composite films, which could increase the physicochemical and biological properties.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Different TiO2 Nanoparticles Concentrations on the Physical and Antibacterial Activities of Chitosan-Based Coating Film

Xing

Guo

et al. 2020

Nanomaterials

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In this investigation, the effect of different concentrations of titanium dioxide (TiO2) nanoparticles (NPs) on the structure and antimicrobial activity of chitosan-based coating films was examined. Analysis using scanning electron microscopy (SEM) and atomic force microscopy (AFM) revealed that the modified TiO2 NPs were successfully dispersed into the chitosan matrix, and that the roughness of the chitosan-TiO2 nanocomposites were significantly reduced. Moreover, X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) analyses indicated that the chitosan interacted with TiO2 NPs and possessed good compatibility, while a thermogravimetric analysis (TGA) of the thermal properties showed that the chitosan-TiO2 nanocomposites with 0.05% TiO2 NPs concentration had the best thermal stability. The chitosan-TiO2 nanocomposite exhibited an inhibitory effect on the growth of Escherichia coli and Staphylococcus aureus. This antimicrobial activity of the chitosan-TiO2 nanocomposites had an inhibition zone ranging from 9.86 ± 0.90 to 13.55 ± 0.35 (mm). These results, therefore, indicate that chitosan-based coating films incorporated with TiO2 NPs might become a potential packaging system for prolonging the shelf-life of fruits and vegetables.

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Section: Determination Of Inhibitory Zones Against E Coli and S Aureusmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Different TiO2 Nanoparticles Concentrations on the Physical and Antibacterial Activities of Chitosan-Based Coating Film

Xing

Guo

et al. 2020

Nanomaterials

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“…Many methods have been investigated to achieve the visible light active TiO 2 photocatalyst. The methods followed made visible light activity by the doping of TiO 2 with transition metals [20]; doping of TiO 2 with non-metals [21]; and coupling of TiO 2 with grapheme et al [22]. It could extend the absorption property in the visible region.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Antibacterial Activity of Silver Doped Titanium Dioxide-Chitosan Composites under Visible Light

Xie

Xia

et al. 2018

Materials

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Nano titanium dioxide (TiO2) with photocatalytic activity was firstly modified by diethanolamine, and it was then doped with broad spectrum antibacterial silver (Ag) by in situ method. Further, both Ag doped TiO2-chitosan (STC) and TiO2-chitosan (TC) composites were prepared by the inverse emulsion cross-linking reaction. The antibacterial activities of STC composites were studied and their antibacterial mechanisms under visible light were investigated. The results show that in situ doping and inverse emulsion method led to good dispersion of Ag and TiO2 nanoparticles on the cross-linked chitosan microsphere. The STC with regular particle size of 1–10 μm exhibited excellent antibacterial activity against E. coli, P. aeruginosa and S. aureus under visible light. It is believed that STC with particle size of 1–10 μm has large specific surface area to contact with bacterial cell wall. The increased antibacterial activity was attributed to the enhancement of both electron-hole separations at the surface of nano-TiO2 by the silver ions under the visible light, and the synergetic and sustained release of strong oxidizing hydroxyl radicals of nano-TiO2, together with silver ions against bacteria. Thus, STC composites have great potential applications as antibacterial agents in the water treatment field.

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“…It is worth noting that CS possesses an excellent film-forming ability, and it can easily be casted into films after dissolution under slightly acidic aqueous conditions. CS has been widely used as a natural source for preparing films in many fields, including packaging, filtration, and some medical applications [11]. The inter- and intra-molecular hydrogen bonding of CS film could improve its mechanical strength [12].…”

Section: Introductionmentioning

confidence: 99%

60Co γ-ray Irradiation Crosslinking of Chitosan/Graphene Oxide Composite Film: Swelling, Thermal Stability, Mechanical, and Antibacterial Properties

et al. 2018

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Abstract:In this paper, chitosan (CS)/graphene oxide (GO) composite films were prepared, and the effect of γ-ray irradiation on the properties of composite films was investigated. The irradiation crosslinking reaction occurred in composite films with the existence of acetic acid, and the properties changed upon the various irradiation dose. The swelling degree of the composite film with 0 wt % GO decreased with the increasing of the irradiation dose, but the swelling degree of which with GO increased instead. The thermal stability increased with the increasing of the irradiation dose, but the effect of the irradiation on the thermal stability weakened as the increasing of the content of GO, due to the enhanced irradiation resistance performance. The tensile strength increased firstly and decreased subsequently with the increasing of the irradiation dose and the content of GO. Composite films showed the enhanced antibacterial activity against Bacillus subtilis, compared to Escherichia coli and Staphylococcus aureus. The antibacterial activity weakened with the increasing of the content of GO. The antibacterial activity was relatively stronger when the irradiation dose was 20 KGy. In addition, the structural, crystal, and morphological properties of composite films were characterized by FT-IR, XRD, and SEM. It is worth noting that the GO was pre-functionalized via KH560 for the better compatibility with CS matrix.

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Photocatalytic and antimicrobial activities of chitosan-TiO2 nanocomposite

Cited by 144 publications

References 50 publications

Effects of Different TiO2 Nanoparticles Concentrations on the Physical and Antibacterial Activities of Chitosan-Based Coating Film

Effects of Different TiO2 Nanoparticles Concentrations on the Physical and Antibacterial Activities of Chitosan-Based Coating Film

Enhanced Antibacterial Activity of Silver Doped Titanium Dioxide-Chitosan Composites under Visible Light

60Co γ-ray Irradiation Crosslinking of Chitosan/Graphene Oxide Composite Film: Swelling, Thermal Stability, Mechanical, and Antibacterial Properties

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