RETRACTED: Graphene quantum dots decorated CdS doped graphene oxide sheets in dual action mode: As initiator and platform for designing of nimesulide imprinted polymer

Patra, Santanu; Roy, Ekta; Choudhary, Raksha; Tiwari, Ashutosh; Madhuri, Rashmi; Sharma, Prashant K.

doi:10.1016/j.bios.2015.12.053

Cited by 16 publications

(8 citation statements)

References 32 publications

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“…The XRD pattern of CCDs shows a broader (002) peak centered at about 21.5°, attributed to highly disordered carbon atoms and confirms the graphene core-structure of the as-prepared CCDs. 25 The broad nature of XRD pattern also suggests the amorphous nature of CCDs (Figure 1D). The functional groups present on the surface of CCDs were investigated by FT-IR (Figure 1E).…”

Section: ■ Results and Discussionmentioning

confidence: 91%

“…In addition, the selected area electron diffraction (SAED) pattern of CCDs was also recorded, which shows the amorphous nature of dots (inset, Figure E). The XRD pattern of CCDs shows a broader (002) peak centered at about 21.5°, attributed to highly disordered carbon atoms and confirms the graphene core-structure of the as-prepared CCDs . The broad nature of XRD pattern also suggests the amorphous nature of CCDs (Figure D).…”

Section: Resultsmentioning

confidence: 98%

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Equipment-Free, Single-Step, Rapid, “On-Site” Kit for Visual Detection of Lead Ions in Soil, Water, Bacteria, Live Cells, and Solid Fruits Using Fluorescent Cube-Shaped Nitrogen-Doped Carbon Dots

Choudhary

Patra

Madhuri

et al. 2016

ACS Sustainable Chem. Eng.

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In this work, we have designed an equipment free, single-step, rapid, cost-effective, "in-house", and "outdoor" kit for visual detection of lead ions (Pb 2+ ) in various real samples viz., soil, water, bacteria, live cells, and solid fruits based on cube-shaped fluorescent carbon dots. The cube-shaped nitrogen-doped carbon dots (CCDs) were prepared using calcein dye as precursor and have potential to be used as better and stable replacement of commercially available dyes. For the visual detection of Pb 2+ , the color of the CCDs changes from yellowish to brown in solution and a limit of detection (LOD) of 10.0 μg L −1 was obtained for the naked eye. In addition, the same CCD solution was also coated on a filter paper strip to fabricate an easy-toprepare paper sensor. The paper sensor was used to identify the Pb 2+ in real samples which proves their applicability toward in-situ on-site detection. In addition, the prepared strip sensor was successfully implemented for analysis of lead ions inside the solid fruit also. For quantitative detection, a photoluminescence (PL) study was carried out for trace level determination of Pb 2+ with LOD of 2.21 ng L −1 . Both the visual as well as PL study also suggested that the results obtained from the CCD sensing probe is free from any interference. We also incubated the CCDs into live cells (E. coli and MCF-7) through endocytosis and monitored the changes in Pb 2+ levels within cells. The study demonstrates the role of prepared fluorescent probe for live cell bioimaging and intracellular detection of metal ions.

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Section: ■ Results and Discussionmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 98%

Equipment-Free, Single-Step, Rapid, “On-Site” Kit for Visual Detection of Lead Ions in Soil, Water, Bacteria, Live Cells, and Solid Fruits Using Fluorescent Cube-Shaped Nitrogen-Doped Carbon Dots

Choudhary

Patra

Madhuri

et al. 2016

ACS Sustainable Chem. Eng.

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“…This broad peak also indicates that the prepared GO QDs have a small particle size 16,41 . This is also mainly due to the presence of oxygenated groups, which increased the d-space between graphene sheets 16,25,42–44 .…”

Section: Resultsmentioning

confidence: 99%

Highly Luminescent Ternary Nanocomposite of Polyaniline, Silver Nanoparticles and Graphene Oxide Quantum Dots

Shokry

Khalil

Ibrahim

et al. 2019

Sci Rep

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Quantum dots (QDs) with photostability show a potential application in optical sensing and biological imaging. In this work, ternary nanocomposite (NC) of high fluorescent polyaniline (PANI)/2-acrylamido-2-methylpropanesulfonic acid (AMPSA) capped silver nanoparticles (NPs)/graphene oxide quantum dots (PANI/Ag (AMPSA)/GO QDs) have been synthesized by in situ chemical oxidative polymerization of aniline in the presence of Ag (AMPSA) NPs and GO QDs. Ag (AMPSA) NPs and GO QDs were prepared by AgNO3 chemical reduction and glucose carbonization methods, respectively. The prepared materials were characterized using UV-visible, Fourier transform infrared (FTIR), photoluminescence and Raman spectroscopies, X-Ray diffractometer (XRD) and high- resolution transmission electron microscopy (HRTEM). HRTEM micrographs confirmed the preparation of GO QDs with an average size of 15 nm and Ag (AMPSA) NPs with an average size of 20 nm. PANI/Ag (AMPSA)/GO QDs NC showed high and stable emission peak at 348 nm. This PANI/Ag (AMPSA)/GO QDs NC can emerge as a new class of fluorescence materials that could be suitable for practical sensing applications.

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“…Molecularly imprinted polymers (MIPs), which are synthetic receptors prepared through templated polymerization, can exhibit antibody-like binding properties or enzyme-like activities. − As MIPs are easier to prepare, more cost-efficient, and more stable than antibodies, they have found promising applications in separation, sensing, , catalysis, and bacteria killing . Recently, by using boronic acids as ligands to bind the glycans of glycoproteins, we have synthesized a series of high-performance MIPs via the photolithographic boronate affinity molecular imprinting , and the boronate affinity-based controllable oriented surface imprinting approaches. − These boronate affinity MIPs exhibited highly attractive binding properties, including high specificity, high affinity, biocompatible binding pH range, and superb tolerance to interferences.…”

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confidence: 99%

Molecularly Imprinted Polymer-Based Plasmonic Immunosandwich Assay for Fast and Ultrasensitive Determination of Trace Glycoproteins in Complex Samples

Muhammad

Liu

et al. 2016

Anal. Chem.

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Glycoproteins play significant roles in many biological processes. Assays of glycoproteins have significant biological importance and clinical values, for which immunoassay has been the workhorse tool. However, immunoassay suffers from some disadvantages, such as poor availability of high-specificity antibodies and limited stability of biological reagents. Herein, we present an antibody-free and enzyme-free approach, called molecularly imprinted polymer (MIP)-based plasmonic immunosandwich assay (PISA), for fast and ultrasensitive detection of trace glycoproteins in complex samples. A gold-based boronate affinity MIP array was used to specifically extract the target glycoprotein from complex samples. After washing away unwanted species, the captured glycoprotein was labeled with boronate affinity silver-based Raman nanotags. Thus, sandwich-like complexes were formed on the array. Upon being shined with a laser beam, the gold-based array generated a surface plasmon wave, which significantly enhanced the surface-enhanced Raman scattering (SERS) signal of the silver-based Raman nanotags. The MIP ensured the specificity of the assay, while the plasmonic detection provided ultrahigh sensitivity. Erythropoietin (EPO), a glycoprotein hormone that controls erythropoiesis or red blood cell production, was employed as a test glycoprotein in this study. Specific detection of EPO in solution down to 2.9 × 10 M was achieved. Using a novel strategy to accommodate the method of standard addition to a logarithmic dose-response relationship, EPO in human urine was quantitatively determined by this approach. The analysis time required only 30 min in total. This approach holds promising application prospects in many areas, such as biochemical research, clinical diagnosis, and antidoping analysis.

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RETRACTED: Graphene quantum dots decorated CdS doped graphene oxide sheets in dual action mode: As initiator and platform for designing of nimesulide imprinted polymer

Cited by 16 publications

References 32 publications

Equipment-Free, Single-Step, Rapid, “On-Site” Kit for Visual Detection of Lead Ions in Soil, Water, Bacteria, Live Cells, and Solid Fruits Using Fluorescent Cube-Shaped Nitrogen-Doped Carbon Dots

Equipment-Free, Single-Step, Rapid, “On-Site” Kit for Visual Detection of Lead Ions in Soil, Water, Bacteria, Live Cells, and Solid Fruits Using Fluorescent Cube-Shaped Nitrogen-Doped Carbon Dots

Highly Luminescent Ternary Nanocomposite of Polyaniline, Silver Nanoparticles and Graphene Oxide Quantum Dots

Molecularly Imprinted Polymer-Based Plasmonic Immunosandwich Assay for Fast and Ultrasensitive Determination of Trace Glycoproteins in Complex Samples

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