Carrageenan-stabilized silver nanoparticle gel probe kit for colorimetric sensing of mercury (II) using digital image analysis

Lobregas, Michaela Olisha S.; Bantang, Jose Paolo O.; Camacho, Drexel H.

doi:10.1016/j.sbsr.2019.100303

Cited by 30 publications

(9 citation statements)

References 38 publications

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“…Meanwhile, in the work reported by Lobregas et al [ 55 ], carrageenan-stabilized AgNPs were used for the colorimetric detection of Hg 2+ . The sensing mechanism is similar to the work reported in [ 54 ] via the interaction of AgNPs with Hg 2+ .…”

Section: Application Of Polysaccharides As Sensing Materials In Optmentioning

confidence: 99%

Polysaccharides as the Sensing Material for Metal Ion Detection-Based Optical Sensor Applications

Azeman

Arsad

Bakar

2020

Sensors

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The incorporation of a proper sensing material towards the construction of high selectivity optical sensing devices is vital. Polysaccharides, such as chitosan and carrageenan, are among the bio-based sensing materials that are extensively employed due to their remarkable physicochemical attributes. This paper highlights the critical aspects of the design of suitable polysaccharides for the recognition of specific analytes through physical and chemical modifications of polysaccharide structure. Such modifications lead to the enhancement of physicochemical properties of polysaccharides and optical sensor performance. Chitosan and carrageenan are two materials that possess excellent features which are capable of sensing target analytes via various interactions. The interaction between polysaccharides and analytes is dependent on the availability of functional groups in their structure. The integration of polysaccharides with various optical sensing techniques further improves optical sensor performance. The application of polysaccharides as sensing materials in various optical sensing techniques is also highlighted, particularly for metal ion sensing.

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Section: Application Of Polysaccharides As Sensing Materials In Optmentioning

confidence: 99%

Polysaccharides as the Sensing Material for Metal Ion Detection-Based Optical Sensor Applications

Azeman

Arsad

Bakar

2020

Sensors

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“…et al [27] reported the sonochemical synthesis of AgNPs with carrageenan as a stabilizer, but with high-intensity ultrasound radiation as reducing agent. Michaela Olisha S. Lobregas et al [28] reported the preparation of gel-based AgNPs with carrageenan for the detection of Hg 2+ . However, using higher concentration of carrageenan, the solution was viscous or even gelatinous.…”

Section: Introductionmentioning

confidence: 99%

Facile and Green Fabrication of Carrageenan-Silver Nanoparticles for Colorimetric Determination of Cu2+ and S2−

et al. 2020

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In the present work, silver nanoparticles (AgNPs) were prepared by a simple and green method using carrageenan as reducing and capping agent. The as-synthesized carrageenan-AgNPs was demonstrated as an effective duel colorimetric sensing for selective and sensitive recognition of Cu2+ and S2−, which could be used to detect these ions with naked eyes. In addition, the possible sensing mechanism was that Cu2+ ions caused serious aggregation of carrageenan-AgNPs, which led to the color change of carrageenan-AgNPs. AgNPs were etched by S2− forming Ag2S, which played an important role in the determination of S2− ions. Furthermore, it has been successfully applied to the determination of Cu2+ and S2− in tap water and lake water, showing its great potential for the analysis of environmental water samples.

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“…The presence of sulfate esters in the molecule provides desirable properties for numerous applications, including gelling agents and water-holding capacity [ 11 ]. For instance, Lobregas, Bantang, and Camacho (2019) [ 12 ] developed an Hg 2+ selective colorimetric detection method employing carrageenan as both a reducing agent and a stabilizer as part of a probe kit with silver nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Carrageenan from Gigartina skottsbergii: A Novel Molecular Probe to Detect SARS-CoV-2

et al. 2023

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The COVID-19 pandemic has caused an unprecedented health and economic crisis, highlighting the importance of developing new molecular tools to monitor and detect SARS-CoV-2. Hence, this study proposed to employ the carrageenan extracted from Gigartina skottsbergii algae as a probe for SARS-CoV-2 virus binding capacity and potential use in molecular methods. G. skottsbergii specimens were collected in the Chilean subantarctic ecoregion, and the carrageenan was extracted —using a modified version of Webber’s method—, characterized, and quantified. After 24 h of incubation with an inactivated viral suspension, the carrageenan’s capacity to bind SARS-CoV-2 was tested. The probe-bound viral RNA was quantified using the reverse transcription and reverse transcription loop-mediated isothermal amplification (RT-LAMP) methods. Our findings showed that carrageenan extraction from seaweed has a similar spectrum to commercial carrageenan, achieving an excellent proportion of binding to SARS-CoV-2, with a yield of 8.3%. Viral RNA was also detected in the RT-LAMP assay. This study shows, for the first time, the binding capacity of carrageenan extracted from G. skottsbergii, which proved to be a low-cost and highly efficient method of binding to SARS-CoV-2 viral particles.

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Carrageenan-stabilized silver nanoparticle gel probe kit for colorimetric sensing of mercury (II) using digital image analysis

Cited by 30 publications

References 38 publications

Polysaccharides as the Sensing Material for Metal Ion Detection-Based Optical Sensor Applications

Polysaccharides as the Sensing Material for Metal Ion Detection-Based Optical Sensor Applications

Facile and Green Fabrication of Carrageenan-Silver Nanoparticles for Colorimetric Determination of Cu2+ and S2−

Carrageenan from Gigartina skottsbergii: A Novel Molecular Probe to Detect SARS-CoV-2

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