Carbon-dot dispersal in PVA thin film for food colorant sensing

Ng, H.K. Melvin; Leo, C.P.; Senanayake, S.M.N. Arosa; Lim, Gin Keat; Tan, Miaomiao

doi:10.1016/j.jece.2019.103187

Cited by 16 publications

(6 citation statements)

References 20 publications

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“…They used these films for the detection of tartrazine, a synthetic food dye, and reported that they can be used as a tartrazine sensor in food quality control, as they can detect tartrazine at a concentration as low as 10 μM. 34 …”

Section: Introductionmentioning

confidence: 99%

“…Kwan et al produced composite films by immobilizing carbon dots (CDs) synthesized by the microwave-assisted hydrothermal method to PVA and PVA/PEG polymer matrixes. They used these films for the detection of tartrazine, a synthetic food dye, and reported that they can be used as a tartrazine sensor in food quality control, as they can detect tartrazine at a concentration as low as 10 μM …”

Section: Introductionmentioning

confidence: 99%

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Multicolor Emitting Carbon Dot-Reinforced PVA Composites as Edible Food Packaging Films and Coatings with Antimicrobial and UV-Blocking Properties

et al. 2022

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Active food packaging has become attractive because of the possibility to provide a longer shelf-life by loading functional agents into the packages to maintain the quality of food products. Herein, photoluminescent and transparent polyvinyl alcohol (PVA)-based composites embedding multicolor fluorescent carbon dots (CD/PVA) were prepared by the solvent casting method. The prepared CDs emit a strong and stable fluorescence in solution while the CD/PVA composite films were transparent, flexible, and showed UV-blocking activity with a strong fluorescence emission. Blue color-emitting CDs showed the highest UV blockage at UVA (87.04%), UVB (87.04%), and UVC (92.22%) regions while PVA alone absorbed only less than 25% of the light in all UV regions. UV blockage capacity was shown to be decreased by half, in line with the emission color shift from blue to red. Thermal properties of the PVA film were improved by the addition of CDs to the polymer, and in vitro cell viability tests showed that none of the CDs were cytotoxic against the human lung fibroblast healthy cell line (MRC-F cells) when integrated into the PVA. The antimicrobial activity of CD/PVA nanofilms was qualitatively determined. The prepared films exhibited good antimicrobial activity against both Gram-positive and Gram-negative bacteria with mild antioxidant and metal chelating activity, and significant inhibition of biofilm formation with a strong link with emitted color and the concentration of the composites. Green- and red-emitting CD/PVA with the highest antimicrobial activity were then analyzed and compared with the plane PVA employing their effect on the shelf-life of strawberries as a model for perishable foods. Fresh strawberries dip coated with CD/PVA and PVA were monitored over time, and virtual evaluations showed that CDs/PVA film coating resulted in reduced weight and moisture loss and significantly inhibited the fungal growth and spoiling for over 6 days at RT and 12 days at fridge conditions maintaining the visual appearance and natural color of the fruit. The findings in this work indicated the potential of reported CD as non-cytotoxic, UV-blocking antimicrobial additives for the development of edible coatings and packages for their use in the food industry, as well as pharmaceutical and healthcare applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multicolor Emitting Carbon Dot-Reinforced PVA Composites as Edible Food Packaging Films and Coatings with Antimicrobial and UV-Blocking Properties

et al. 2022

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“…2 c, it was revealed that the excitation wavelength of CQD adsorbent was achieved at 448 nm, which implies that the luminescent properties were primarily attributed to the bandgap transitions 38 – 40 , which were observed to correspond to the surface defects existing in the CQDs, supporting the findings of Raman spectroscopy results. The sp 2 hybridization of carbon clusters, along with the slight differences in particle size distribution, may also be attributed to the influence of the fluorescence aspects of the CQDs 12 , 35 , 37 , 63 , 64 . Moreover, the high excitation intensity of the CQDs subsequently resulted in higher energy emissions by the material, which influenced its luminescent properties.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of highly fluorescent carbon quantum dots from rubber seed shells for the adsorption and photocatalytic degradation of dyes

Nizam,

Hanafiah,

Mahmoudi

et al. 2023

Sci Rep

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The potentials of biomass-based carbon quantum dot (CQD) as an adsorbent for batch adsorption of dyes and its photocatalytic degradation capacity for dyes which are congo red (CR) and methylene blue (MB) have been conducted in this study. The CQDs properties, performance, behaviour, and photoluminescence characteristics were assessed using batch adsorption experiments which were carried out under operating conditions including, temperature, pH and dosage. The morphological analysis revealed that CQDs are highly porous, uniform, closely aligned and multi-layered. The presence of hydroxyl, carboxyl and carbonyl functional groups indicated the significance of the oxygenated functional groups. Spectral analysis of photoluminescence for CQDs confirmed their photoluminescent quality by exhibiting high excitation intensity and possessing greenish-blue fluorescence under UV radiation. The removal percentage of the dyes adsorbed for both CR and MB dyes was 77% and 75%. Langmuir isotherm and pseudo-second-order models closely fitted the adsorption results. Thermodynamics analysis indicated that the adsorption process was exothermic and spontaneous, with excellent reusability and stability. The degradation efficiency of CQDs on both dyes was more than 90% under sunlight irradiation and obeyed the first-order kinetic model. These results demonstrated CQDs to be an excellent adsorbent and outstanding photocatalyst for organic dye degradation.

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“…The characterization of the synthesized PVA-CQD thin films were compared with that of PVA thin films, with no observable morphological and compositional changes after the immobilization of CQDs, results comparable with those of previous investigations. 29…”

Section: Preparation and Characterization Of Folic Acid Cqds And Cqd-...mentioning

confidence: 99%

Chemical sensor thin film-based carbon quantum dots (CQDs) for the detection of heavy metal count in various water matrices

Vyas,

Joshi

2024

Analyst

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Carbon-dot dispersal in PVA thin film for food colorant sensing

Cited by 16 publications

References 20 publications

Multicolor Emitting Carbon Dot-Reinforced PVA Composites as Edible Food Packaging Films and Coatings with Antimicrobial and UV-Blocking Properties

Multicolor Emitting Carbon Dot-Reinforced PVA Composites as Edible Food Packaging Films and Coatings with Antimicrobial and UV-Blocking Properties

Synthesis of highly fluorescent carbon quantum dots from rubber seed shells for the adsorption and photocatalytic degradation of dyes

Chemical sensor thin film-based carbon quantum dots (CQDs) for the detection of heavy metal count in various water matrices

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