Magnetic beads based colorimetric detection of mercuric ion

Huang, Xijing; Hao, Yanlin; Wu, Hanyin; Guo, Qingquan; Guo, Liangqia; Wang, Jing; Zhong, Liangshuang; Lin, Tianran; Fu, FengFu; Chen, Guonan

doi:10.1016/j.snb.2013.10.025

Cited by 19 publications

(11 citation statements)

References 27 publications

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“…Sensor untuk logam dapat memberikan prosedur yang murah, sederhana, cepat dan mudah dalam pemantauan harian secara rutin [5]. Visualisasi hasil sensor warna yang didasarkan pada perubahan warna yang terjadi menggunakan mata atau spektrofotometer UV-Vis [15].…”

Section: Pendahuluanunclassified

Pembuatan Dan Optimasi Sensor Warna Logam Besi Terlarut Dalam Air Dengan Matriks Karagenan

Susanto

Siswanta

2020

J. ilm. Teknik. Kimia

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Karagenan merupakan polimer alam anionik yang mempunyai sifat hidrogel. Kemampuan tersebut memberikan kemungkinan karagenan dijadikan matriks untuk sensor logam besi di dalam air. Sensor logam besi diukur sebagai ion Fe2+. Ion Fe2+ mempunyai kemampuan membentuk kompleks stabil dengan fenantrolin dan memberikan warna jingga. Dalam Pengembangan sensor warna didasarkan pada imobilisasi gugus kromofor pada material pendukung. Oleh karena itu pada penelitian dilakukan pembuatan sensor warna dengan gugus kromofor kompleks Fe2+ dengan fenantrolin di dalam mtriks karagenan. Hasil penelitian diperoleh modifikasi matriks dalam bentuk beads campuran karagenan kappa dan iota sehingga menghasilkan sensor warna tanpa pelindian. Hasil sensor warna divisualisasi dengan mata dan spektrofotometer UV-Vis. Kondisi optimum yang diperoleh dari penelitian meliputi panjang gelombang maksimum 510 nm, konsentrasi fenantrolin yang diimobilisasi 3000 mg L-1 volume total larutan pembuat beads, pH larutan besi adalah 2, dan waktu kompleksasi 15 menit.

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Section: Pendahuluanunclassified

Pembuatan Dan Optimasi Sensor Warna Logam Besi Terlarut Dalam Air Dengan Matriks Karagenan

Susanto

Siswanta

2020

J. ilm. Teknik. Kimia

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“…Because Hg 2+ can specifically link two thymine bases and form a stable thymine-Hg 2+ -thymine (T-Hg 2+ -T) mismatch in a DNA duplex, 21 some novel methods based on the formation of the T-Hg 2+ -T structure have been developed in order to overcome the limitations of traditional approaches. [22][23][24][25][26][27][28] For example, Kong's group 22 utilized the T-Hg 2+ -T base pairs to trigger the formation of catalytically active G-quadruplex DNAzymes and developed the "turn-on" colorimetric sensors; Zeng's group 26 constructed an electrochemical sensor for mercury detection in environmental samples by using mercury-specific oligonucleotides, three dimensional gold nanoclusters, and an anionic intercalator; Tang's group 27 developed a fluorescent sensor for Hg 2+ assay by using Hg 2+ specific DNA functionalized gold nanoparticles (AuNPs) based on the formation of T-Hg 2+ -T complex and the excellent quenching fluorescence property of AuNPs. However, those assays mentioned above suffer from one or more of the following disadvantages, such as low sensitivity, high cost, and complexity.…”

Section: Introductionmentioning

confidence: 99%

Amplified Fluorescent Detection of Mercuric Ions by Conjugation of the ThT-induced G-Quadruplex Based Hybridization Chain Reaction

Chen

Tan

et al. 2017

ANAL. SCI.

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A sensitive fluorescent method for the detection of Hg 2+ was developed based on triple-helix molecular switch (THMS)-induced hybridization chain reaction (HCR) amplification. THMS was composed of a T-rich mercury-specific probe and an initiator probe, designed by the Watson-Crick and Hoogsteen base pairings and employed as a signal trigger. Two hairpin probes containing the G-quadruplex sequence were used as signal amplification elements. In the presence of Hg 2+ , the T-Hg 2+ -T mismatch resulted in disassembling the THMS and releasing the initiator probe. One of the hairpins was opened by the released initiator probe, which triggered a successive cross-opening of two hairpins based the strand displacement principle, resulting in the formation of long-chain DNA with multiple G-quadruplex. When thioflavin T (ThT), a fluorophore, was bound to the G-quadruplex, an obvious fluorescence enhancement would occur. This sensing system enabled the highly sensitive and selective detection of aqueous Hg 2+ with a limit-of-detection of 10.2 pM.

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“…Herein, inspired by the stimulation or inhibition effect on the peroxidase-like activity of various nanomaterials by heavy metal ions [24][25][26][27][28][29], we explored a spectrophotometric assay for the determination of Hg(II), based on its stimulating effect on the peroxidase-like activity of MoS 2 -NSs. The MoS 2 -NSs are found to act as a peroxidase mimic, capable of effectively oxidizing the substrate 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of H 2 O 2 .…”

Section: Introductionmentioning

confidence: 99%

Spectrophotometric determination of mercury(II) ions based on their stimulation effect on the peroxidase-like activity of molybdenum disulfide nanosheets

Lü

et al. 2016

Microchim Acta

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The authors describe a colorimetric method for the determination of Hg(II) ions by exploiting the peroxidase-lile activity of few-layered MoS 2 nanosheets (MoS2-NSs). These were prepared by sonication-induced exfoliation of bulk MoS 2 crystals in aqueous surfactant solution. The MoS2-NSs were found to acts as a peroxidase mimic that is capable of oxidizing the substrate 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of hydrogen peroxide (H2O2) to give a blue product with an absorption maximum at 652 nm. The addition of Hg(II) strongly accelerates the kinetics of this reaction. It is shown that the enzyme mimic possesses a high affinity for TMB and a lower pseudo-Michaelis-Menten constant. The stimulating effect of Hg(II) is seriously influenced by the change of surface charge. The use of nanosheets covered with (negatively charged) polystyrene sulfonate results in a decrease in the formation of blue dye, while those covered with (cationic) poly(diallyldimethyl ammonium) ions cause a small increase. Under optimal conditions, the peroxidase-like activity of MoS2-NSs is affected by Hg(II) in the 2.0 to 200 μM concentration range. The method has a detection limit (LOD) of 0.5 μM which is much below the allowed level in cosmetics (1 ppm; ca. 5 μM). The method display excellent sensitivity, selectivity and stability. It was applied to the determination of total mercury in cosmetic samples, and results compared well with results obtained by ICP-AES.

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Magnetic beads based colorimetric detection of mercuric ion

Cited by 19 publications

References 27 publications

Pembuatan Dan Optimasi Sensor Warna Logam Besi Terlarut Dalam Air Dengan Matriks Karagenan

Pembuatan Dan Optimasi Sensor Warna Logam Besi Terlarut Dalam Air Dengan Matriks Karagenan

Amplified Fluorescent Detection of Mercuric Ions by Conjugation of the ThT-induced G-Quadruplex Based Hybridization Chain Reaction

Spectrophotometric determination of mercury(II) ions based on their stimulation effect on the peroxidase-like activity of molybdenum disulfide nanosheets

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