Fabrication of eco-friendly hydrogel strips for the simultaneous quantification of heavy metal ions in aqueous environment

Mohan, Anandhu; Prakash, John

doi:10.1016/j.dyepig.2021.110045

Cited by 9 publications

(5 citation statements)

References 35 publications

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“…The lowest concentration of mercury ions (Hg 2+ ) in water samples was detectable in the most recent study using anthocyanin hydrogel (LOD 0.2 µM by linear-graph estimation) [110], followed by curcumin-gold nanoparticles, with a visual LOD of 2 µM [86], compared to betalain (LOD 25 µM) and chlorophyll (LOD 2.7 µM with UV-Vis spectrophotometry, 60 µM visually) [71,117]. Mohan and Prakash also reported that a colour change at 10 µM can be visually observable, but the lowest concentration for naked eye observation was not reported [110]. For inorganic mercury, the maximum contamination in drinking water of not more than 6 µg/L (0.029 µM) is set by WHO [118].…”

Section: Comparative Results Of Metal Detector Using Natural Pigmentsmentioning

confidence: 99%

“…Some references also reported simple pre-treatment steps during application to real samples. Filtration is mostly used to remove insoluble materials [59,110,117]. Continuous improvements on sensitivity and selectivity to reduce false positives/negatives are essential to produce reliable methods.…”

Section: Comparative Results Of Metal Detector Using Natural Pigmentsmentioning

confidence: 99%

“…Eco-friendly fabricated hydrogel strips were also developed for Cd and Hg detection in water samples. The strips changed colour from white to green and blue to indicate a positive result for Cd 2+ and Hg 2+ , respectively [110]. Fabricated forms are more portable than solution-based forms and support naked eye observations for qualitative purposes.…”

Section: Anthocyaninmentioning

confidence: 95%

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An Update on the Use of Natural Pigments and Pigment Nanoparticle Adducts for Metal Detection Based on Colour Response

2023

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Natural pigments occur in plants as secondary metabolites and have been used as safe colourants in food. Studies have reported that their unstable colour intensity might be related to metal ion interaction, which leads to the formation of metal–pigment complexes. This underlines the need for further investigations on the use of natural pigments in metal detection using colorimetric methods, since metals are important elements and can be hazardous when present in large amounts. This review aimed to discuss the use of natural pigments (mainly betalains, anthocyanins, curcuminoids, carotenoids, and chlorophyll) as reagents for portable metal detection based on their limits of detection, to determine which pigment is best for certain metals. Colorimetric-related articles over the last decade were gathered, including those involving methodological modifications, sensor developments, and a general overview. When considering sensitivity and portability, the results revealed that betalains are best applied for copper, using a smartphone-assisted sensor; curcuminoids are best applied for lead, using a curcumin nanofiber; and anthocyanin is best applied for mercury, using anthocyanin hydrogel. This provides a new perspective on the use of colour instability for the detection of metals with modern sensor developments. In addition, a coloured sheet representing metal concentrations may be useful as a standard to support on-site detection with trials on masking agents to improve selectivity.

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Section: Comparative Results Of Metal Detector Using Natural Pigmentsmentioning

confidence: 99%

Section: Comparative Results Of Metal Detector Using Natural Pigmentsmentioning

confidence: 99%

Section: Anthocyaninmentioning

confidence: 95%

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An Update on the Use of Natural Pigments and Pigment Nanoparticle Adducts for Metal Detection Based on Colour Response

2023

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“…Due to the metallophilic interaction of Hg 2+ /Au 2+ , the fluorescence of the hydrogel beads was completely quenched in the presence of Hg 2+ . Furthermore, to develop cost‐effective and environment‐friendly analytical tools, the hydrogel strips designed by incorporating natural plant‐derived fluorescent dyes (curcumin and anthocyanin) in biodegradable polyethylene glycol diacrylate hydrogels showed satisfactory accuracy in the precise quantification of Hg 2+ and Cd 2+ (Mohan & Prakash, 2022).…”

Section: Innovative Biosensor‐based Devices For Hmis Detectionmentioning

confidence: 99%

Recent advances and trends in innovative biosensor‐based devices for heavy metal ion detection in food

Aihaiti,

Wang,

Zhang

et al. 2024

Comp Rev Food Sci Food Safe

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Low‐cost, reliable, and efficient biosensors are crucial in detecting residual heavy metal ions (HMIs) in food products. At present, based on distance‐induced localized surface plasmon resonance of noble metal nanoparticles, enzyme‐mimetic reaction of nanozymes, and chelation reaction of metal chelators, the constructed optical sensors have attracted wide attention in HMIs detection. Besides, based on the enrichment and signal amplification strategy of nanomaterials on HMIs and the construction of electrochemical aptamer sensing platforms, the developed electrochemical biosensors have overcome the plague of low sensitivity, poor selectivity, and the inability of multiplexed detection in the optical strategy. Moreover, along with an in‐depth discussion of these different types of biosensors, a detailed overview of the design and application of innovative devices based on these sensing principles was provided, including microfluidic systems, hydrogel‐based platforms, and test strip technologies. Finally, the challenges that hinder commercial application have also been mentioned. Overall, this review aims to establish a theoretical foundation for developing accurate and reliable sensing technologies and devices for HMIs, thereby promoting the widespread application of biosensors in the detection of HMIs in food.

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“…Earlier, Mohan and Prakash [ 45 ] fabricated eco-friendly hydrogel strips with curcumin and anthocyanin extracts from turmeric and red cabbage. These strips can be used for visual detection of Hg 2+ and Cd 2+ in river water samples under a UV chamber and emit color when in the presence of heavy metals (Hg 2+ = green and Cd 2+ = blue).…”

Section: Application Of Natural-derivedmentioning

confidence: 99%

Natural and Engineered Nanomaterials for the Identification of Heavy Metal Ions—A Review

et al. 2022

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In recent years, there has been much interest in developing advanced and innovative approaches for sensing applications in various fields, including agriculture and environmental remediation. The development of novel sensors for detecting heavy metals using nanomaterials has emerged as a rapidly developing research area due to its high availability and sustainability. This review emphasized the naturally derived and engineered nanomaterials that have the potential to be applied as sensing reagents to interact with metal ions or as reducing and stabilizing agents to synthesize metallic nanoparticles for the detection of heavy metal ions. This review also focused on the recent advancement of nanotechnology-based detection methods using naturally derived and engineered materials, with a summary of their sensitivity and selectivity towards heavy metals. This review paper covers the pros and cons of sensing applications with recent research published from 2015 to 2022.

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Fabrication of eco-friendly hydrogel strips for the simultaneous quantification of heavy metal ions in aqueous environment

Cited by 9 publications

References 35 publications

An Update on the Use of Natural Pigments and Pigment Nanoparticle Adducts for Metal Detection Based on Colour Response

An Update on the Use of Natural Pigments and Pigment Nanoparticle Adducts for Metal Detection Based on Colour Response

Recent advances and trends in innovative biosensor‐based devices for heavy metal ion detection in food

Natural and Engineered Nanomaterials for the Identification of Heavy Metal Ions—A Review

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