Biosynthesis of gold decorated reduced graphene oxide and its biological activities

Saikia, Indranirekha; Sonowal, Shashanka; Pal, Mintu; Boruah, Purna K.; Das, Manash R.; Tamuly, Chandan

doi:10.1016/j.matlet.2016.05.011

Cited by 43 publications

(15 citation statements)

References 15 publications

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“…The XRD image revealed the peaks at 2 θ value 38.20, 44.48, 64.18, 78.46, and 81.14 which is associated to (111), (200), (220), (311) and (222) plane of cubic Au nanoparticles, respectively (JCPDS card No 004–0784) (Figure S[B]). The result was similar to the reported data . The SEM‐EDX study reflected the presence of Au, C and O elements in the sample (weight C: 47.28%, O: 39.21% and Au: 13.12%) in Au‐rGO nanocomposite [Figure S[B]).…”

Section: Resultssupporting

confidence: 89%

“…The peak at 1378 cm −1 assigned presence of carboxyl (C−O) and at 1040 cm −1 is attributed to epoxy C−O functional group available at the edges of GO respectively . Similarly, the FT‐IR of Au‐rGO and Ag‐rGO are reported in supporting information [Figure S A−B] which is similar with previous results ,…”

Section: Resultssupporting

confidence: 86%

“…The SEM‐EDX study reflected the presence of Au, C and O elements in the sample (weight C: 47.28%, O: 39.21% and Au: 13.12%) in Au‐rGO nanocomposite [Figure S[B]). It is also supported by reported result ,. The Au nanoparticles appeared as hexagonal, pentagonal and some irregular geometry shape.…”

Section: Resultssupporting

confidence: 85%

“…The peak at 2 θ value 20.4 may be due to presence of C (002) of rGO nanosheet. It is supported by reported literature . The SEM‐EDX study revealed that the presence of Ag, C and O elements (weight; C: 45.29%, O: 38.18% and Ag: 16.64% in Ag‐rGO nanocomposite (Figure S[A]).…”

Section: Resultssupporting

confidence: 85%

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Synthesis of Pd‐rGO Nanocomposite for the Evaluation of In Vitro Anticancer and Antidiabetic Activities

et al. 2019

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Biosynthesis of Pd-rGO nanocomposite using water extract of Zanthoxylum armatum C.DC is reported here. The nanocomposite was characterized using X-Ray Diffraction (XRD), Fourier Transform Infrared (FT-IR), Transmission Electron Microscope (TEM), Scanning Electron Microscope-Energy Dispersive X-ray Spectroscopy (SEM-EDX), X-ray Photoelectron Spectroscopy (XPS), Raman and Thermo-gravimetric (TG) analysis. Similarly, the Ag-rGO and Au-rGO nanocomposite were synthesized using the water extract of Zanthoxylum armatum C.DC. A comparative study was done on α-glucosidase inhibition activity and cytotoxicity effect for these nanocomposites. The α-glucosidase inhibition assay revealed that the Pd-rGO nanocomposite has excellent inhibitory potency compared to GO, Ag-rGO and Au-rGO nanocomposite respectively. In this study, the 50% inhibition concentration (IC 50 ) value was observed at 0.0218 � 0.01 and 1.051 � 0.28 μg/ml for Pd-rGO and GO respectively. Overall our novel findings showed that the cytotoxic effect of Pd-rGO nanocomposite was higher than other M-rGO (M=Ag, Au) and GO against prostate cancer DU145 cells compared to non-tumorigenic prostate epithelial cells, RWPE-1.

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Section: Resultssupporting

confidence: 89%

Section: Resultssupporting

confidence: 86%

Section: Resultssupporting

confidence: 85%

Section: Resultssupporting

confidence: 85%

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Synthesis of Pd‐rGO Nanocomposite for the Evaluation of In Vitro Anticancer and Antidiabetic Activities

et al. 2019

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“…a, all spectra of the samples exhibit two prominent peaks in the range of 1,347–1,360 cm −1 (D‐band) and 1,571–1,597 cm −1 (G‐band), respectively. The D‐band is related to defect and edge sites in graphitic structure, while the G‐band corresponds to the CC vibration of regular sp 2 carbon skeleton in a two‐dimensional hexagonal lattice . With the increase of oxidation degree of GO, the D‐band and G‐band of GO samples shift to higher peak positions, indicating that the higher oxidation degrees cause the structural defects, reduced number of layers and discrete graphitic islands in the GO structure .…”

Section: Resultsmentioning

confidence: 99%

Impact of various oxidation degrees of graphene oxide on the performance of styrene–butadiene rubber nanocomposites

Yang

Yin

Zhang

et al. 2017

Polymer Engineering & Sci

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In this work, graphene oxide (GO) with various oxidation degrees were synthesized by adjusting the dosage of oxidation agent based on a modified Hummers' method, and were then used for the fabrication of the styrene–butadiene rubber (SBR)/GO nanocomposites through latex coagulation method, followed by a high‐temperature cure process. The vulcanization characteristics, thermal stability, mechanical properties, thermal conductivity as well as solvent resistance of SBR/GO nanocomposites were investigated. The results indicated that various surface structures of GO due to oxidation degrees may lead to different dispersion states of GO in the rubber matrix, and thus greatly influenced the cure rate, mechanical properties as well as thermal conductivity of SBR/GO nanocomposites. The optimal (moderate) oxidation degree of GO was achieved at the oxidation agent (KMnO4)/graphite weight ratio 9/5, for which case the tensile strength, tear strength, and thermal conductivity of SBR/GO nanocomposites increased by 271.3%, 112.3%, and 28.6%, respectively, compared with those of neat SBR. In addition, the mentioned nanocomposites also showed the best solvent resistance in toluene. POLYM. ENG. SCI., 58:1409–1418, 2018. © 2017 Society of Plastics Engineers

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Fabrication of Au/Fe₃O₄/RGO based aptasensor for measurement of miRNA‐128, a biomarker for acute lymphoblastic leukemia (ALL)

Dinani

Pourmadadi

Yazdian

et al. 2022

Engineering in Life Sciences

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Due to their high sensitivity, simplicity, portability, self‐contained, and low cost, the development of electrochemical biosensors is a beneficial way to diagnose and anticipate many types of cancers. An electrochemical nanocomposite‐based aptasensor is fabricated for the determination of miRNA‐128 concentration as the acute lymphoblastic leukemia (ALL) biomarker for the first time. The aptamer chains were immobilized on the surface of the glassy carbon electrode (GCE) through gold nanoparticles/magnetite/reduced graphene oxide (AuNPs/Fe3O4/RGO). Fast Fourier transform infrared (FTIR), X‐ray diffraction (XRD), vibrating sample magnetometer (VSM), and transmission electron microscopy (TEM) were used to characterize synthesized nanomaterials. Cyclic voltammetry (CV), square wave voltammetry (SWV), and electrochemical impedance spectroscopy (EIS) were used to characterize the modified GCE in both label‐free and labeled methods. The results indicate that the modified working electrode has high selectivity and for miRNA‐128 over other biomolecules. The hexacyanoferrate redox system typically operated at around 0.3 V (vs. Ag/AgCl), and the methylene blue redox system ran at about 0 V, were used as an electrochemical probe. The detection limit and linear detection range for hexacyanoferrate and methylene blue are 0.05346 fM, 0.1–0.9 fM, and 0.005483 fM, 0.01–0.09 fM, respectively. The stability and diffusion control analyses were performed as well. In both label‐free and labeled methods, the modified electron showed high selectivity for miRNA‐128. The use of methylene blue as a safer redox mediator caused miRNA‐128 to be detected with greater accuracy at low potentials in PBS media. The findings also show the substantial improvement in detection limit and linearity by using reduced graphene oxide‐magnetite‐gold nanoparticles that can be verified by comparing with previous studies on the detection of other miRNAs.

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Biosynthesis of gold decorated reduced graphene oxide and its biological activities

Cited by 43 publications

References 15 publications

Synthesis of Pd‐rGO Nanocomposite for the Evaluation of In Vitro Anticancer and Antidiabetic Activities

Synthesis of Pd‐rGO Nanocomposite for the Evaluation of In Vitro Anticancer and Antidiabetic Activities

Impact of various oxidation degrees of graphene oxide on the performance of styrene–butadiene rubber nanocomposites

Fabrication of Au/Fe₃O₄/RGO based aptasensor for measurement of miRNA‐128, a biomarker for acute lymphoblastic leukemia (ALL)

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Biosynthesis of gold decorated reduced graphene oxide and its biological activities

Cited by 43 publications

References 15 publications

Synthesis of Pd‐rGO Nanocomposite for the Evaluation of In Vitro Anticancer and Antidiabetic Activities

Synthesis of Pd‐rGO Nanocomposite for the Evaluation of In Vitro Anticancer and Antidiabetic Activities

Impact of various oxidation degrees of graphene oxide on the performance of styrene–butadiene rubber nanocomposites

Fabrication of Au/Fe3O4/RGO based aptasensor for measurement of miRNA‐128, a biomarker for acute lymphoblastic leukemia (ALL)

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Fabrication of Au/Fe₃O₄/RGO based aptasensor for measurement of miRNA‐128, a biomarker for acute lymphoblastic leukemia (ALL)