SERS detection of red organic dyes in Ag-agar gel

2012 ◽  
Vol 44 (1) ◽  
pp. 47-54 ◽  
Author(s):  
Cristiana Lofrumento ◽  
Marilena Ricci ◽  
Elena Platania ◽  
Maurizio Becucci ◽  
Emilio Castellucci
Keyword(s):  
Organic Dyes ◽  
Agar Gel ◽  
Sers Detection

Suitability of Ag-agar gel for the micro-extraction of organic dyes on different substrates: the case study of wool, silk, printed cotton and a panel painting mock-up

2014 ◽  
Vol 45 (11-12) ◽  
pp. 1133-1139 ◽  
Author(s):  
Elena Platania ◽  
John R. Lombardi ◽  
Marco Leona ◽  
Nobuko Shibayama ◽  
Cristiana Lofrumento ◽  
...  
Keyword(s):  
Organic Dyes ◽  
Agar Gel ◽  
Panel Painting

scholarly journals Preparation of Graphene Oxide Decorated Fe3O4@SiO2Nanocomposites with Superior Adsorption Capacity and SERS Detection for Organic Dyes

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Song Yang ◽  
Tian Zeng ◽  
Yaling Li ◽  
Jun Liu ◽  
Qian Chen ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Organic Dyes ◽  
Infrared Spectrometry ◽  
X Ray Diffraction ◽  
Fast Detection ◽  
Adsorption Behaviors ◽  
Transmission Electron ◽  
Surface Enhanced Raman ◽  
Detectable Concentration ◽  
Sers Detection

The fast detection and removal of organic dyes from contaminated water has become an urgent environmental issue due to their high toxicity, chemical stability, and low biodegradability. In this paper, we have developed graphene oxide decorated Fe3O4@SiO2(Fe3O4@SiO2-GO) as a novel adsorbent aiming at the rapid adsorption and trace analysis of organic dyes followed by surface enhanced Raman scattering (SERS). The structure and morphology of the nanocomposites were characterized by transmission electron microscopy (TEM), Fourier infrared spectrometry (FT-IR), X-ray diffraction (XRD), and vibrating sample magnetometer (VSM). The obtained nanocomposites were used to adsorb methylene blue (MB) in aqueous solution based onπ-πstacking interaction and electrostatic attraction between MB and GO, and the adsorption behaviors of MB were investigated. Moreover, the obtained nanocomposites with adsorbed dyes were separated from the solution and loaded with silver nanoparticles for SERS detection. These nanocomposites showed superior SERS sensitivity and the lowest detectable concentration was 1.0 × 10−7 M.

scholarly journals Self-sustainable and recyclable ternary Au@Cu2O–Ag nanocomposites: application in ultrasensitive SERS detection and highly efficient photocatalysis of organic dyes under visible light

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Tong Wu ◽  
Hui Zheng ◽  
Yichuan Kou ◽  
Xinyue Su ◽  
Naveen Reddy Kadasala ◽  
...  
Keyword(s):  
Visible Light ◽  
Organic Dyes ◽  
Galvanic Replacement ◽  
Sers Substrates ◽  
Replacement Method ◽  
Wide Range ◽  
Surface Enhanced Raman ◽  
Sers Detection ◽  
Semiconductor Nanocomposites ◽  
Ag Ncs

AbstractTernary noble metal–semiconductor nanocomposites (NCs) with core–shell–satellite nanostructures have received widespread attention due to their outstanding performance in detecting pollutants through surface-enhanced Raman scattering (SERS) and photodegradation of organic pollutants. In this work, ternary Au@Cu2O–Ag NCs were designed and prepared by a galvanic replacement method. The effect of different amounts of Ag nanocrystals adsorbed on the surfaces of Au@Cu2O on the SERS activity was investigated based on the SERS detection of 4-mercaptobenzoic acid (4-MBA) reporter molecules. Based on electromagnetic field simulations and photoluminescence (PL) results, a possible SERS enhancement mechanism was proposed and discussed. Moreover, Au@Cu2O–Ag NCs served as SERS substrates, and highly sensitive SERS detection of malachite green (MG) with a detection limit as low as 10−9 M was achieved. In addition, Au@Cu2O–Ag NCs were recycled due to their superior self-cleaning ability and could catalyze the degradation of MG driven by visible light. This work demonstrates a wide range of possibilities for the integration of recyclable SERS detection and photodegradation of organic dyes and promotes the development of green testing techniques.

Control of Rate of Solute Transport in Newly Developed Portable Agar Gel Blood Purification System

1998 ◽  
Vol 2 (1) ◽  
pp. 67-70
Author(s):  
Akihiro C. Yamashita ◽  
Ryoichi Sakiyama ◽  
Hiroyuki Hamada ◽  
Kakuji J. Tojo
Keyword(s):  
Solute Transport ◽  
Blood Purification ◽  
Agar Gel ◽  
Purification System

Dose-response Curves in the Fibrin Plate Assay Fibrinolytic Activity of Proteases

1974 ◽  
Vol 32 (02/03) ◽  
pp. 356-365 ◽  
Author(s):  
F Haverkate ◽  
D. W Traas
Keyword(s):  
Dose Response ◽  
Fibrinolytic Activity ◽  
Enzyme Concentration ◽  
Response Curves ◽  
Agar Gel ◽  
Porcine Tissue ◽  
Plate Assay ◽  
Fibrin Plate ◽  
Different Types ◽  
Dose Response Curves

SummaryIn the fibrin plate assay different types of relationships between the dose of applied proteolytic enzyme and the response have been previously reported. This study was undertaken to determine whether a generally valid relationship might exist.Trypsin, chymotrypsin, papain, the plasminogen activator urokinase and all of the microbial proteases investigated, including brinase gave a linear relationship between the logarithm of the enzyme concentration and the diameter of the circular lysed zone. A similar linearity of dose-response curves has frequently been found by investigators who used enzyme plate assays with substrates different from fibrin incorporated in an agar gel. Consequently, it seems that this linearity of dose-response curves is generally valid for the fibrin plate assay as well as for other enzyme plate bioassays.Both human plasmin and porcine tissue activator of plasminogen showed deviations from linearity of semi-logarithmic dose-response curves in the fibrin plate assay.

Agar-gel precipitin reactions in experimental paragonimiasis

1981 ◽  
Vol 19 (2) ◽  
pp. 101 ◽  
Author(s):  
Won Young Choi ◽  
Ok Ran Lee
Keyword(s):  
Agar Gel

Quantum Dot Bioconjugates as Energy Donors in Fluorescence Resonance Energy Transfer Assays

2003 ◽  
Vol 773 ◽  
Author(s):  
Aaron R. Clapp ◽  
Igor L. Medintz ◽  
J. Matthew Mauro ◽  
Hedi Mattoussi
Keyword(s):  
Energy Transfer ◽  
Quantum Dot ◽  
Organic Dyes ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Genetically Engineered ◽  
Molar Ratio ◽  
Binding Assays ◽  
Specific Sequence ◽  
Donor Acceptor

AbstractLuminescent CdSe-ZnS core-shell quantum dot (QD) bioconjugates were used as energy donors in fluorescent resonance energy transfer (FRET) binding assays. The QDs were coated with saturating amounts of genetically engineered maltose binding protein (MBP) using a noncovalent immobilization process, and Cy3 organic dyes covalently attached at a specific sequence to MBP were used as energy acceptor molecules. Energy transfer efficiency was measured as a function of the MBP-Cy3/QD molar ratio for two different donor fluorescence emissions (different QD core sizes). Apparent donor-acceptor distances were determined from these FRET studies, and the measured distances are consistent with QD-protein conjugate dimensions previously determined from structural studies.

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