Stability and characterization of iron(III) and iron(II) heme peptides encapsulated in aqueous detergent micelles: proton NMR and UV-visible spectroscopic studies

1991 ◽  
Vol 30 (4) ◽  
pp. 700-705 ◽  
Author(s):  
Shyamalava. Mazumdar ◽  
Okhil K. Medhi ◽  
Samaresh. Mitra
Keyword(s):  
Proton Nmr ◽  
Spectroscopic Studies ◽  
Heme Peptides ◽  
Uv Visible ◽  
Aqueous Detergent ◽  
Detergent Micelles

scholarly journals Extraction, Screening and Spectral Characterization of Tannins from Acacia Xanthophloea (Fever Tree) Bark

2020 ◽  
pp. 1-10
Author(s):  
Ramesh Duraisamy ◽  
Tesema Shuge ◽  
Bezawit Worku ◽  
Abiyu Kerebo Berekete ◽  
Karthikeyan M Ramasamy
Keyword(s):  
Moisture Content ◽  
Random Sampling ◽  
Vacuum Distillation ◽  
Sampling Method ◽  
Soxhlet Extraction ◽  
Spectroscopic Studies ◽  
Tree Bark ◽  
Acacia Species ◽  
Uv Visible

Identifying studied sample acacia species selected and collected from Bekele Molla Hotel Avenue, Chamo Kebele, Arba Minch under convenient random sampling method. Tannins extracted using the solvents such as water (at 60 & 900C), methanol (at 900C) and its 1:1 mixture (at 900C) by employing Soxhlet extraction. Extracted crude tannins was separated and purified under vacuum distillation. The photochemical screening and quantitative determinations of sample carried out. Furthermore, the sample of tannins characterized by employing U-visible and FTIR spectroscopic studies. Methonalic extract consist moisture content and % yield about 17.86±0.51 % and 52.55 %. The results of Uv-visible and FTIR spectroscopic studies were supporting that the sample of Acacia xanthophloea has tannins and flavonoids. Thus, this study reveals and confirmed that the methanol is more suitable solvent for extraction of tannins over than water

Green Synthesis and Spectroscopic Studies of Ag-rGO Nanocomposites for Highly Selective Mercury (II) Sensing

2018 ◽  
Vol 9 (1) ◽  
pp. 101-108 ◽  
Author(s):  
Shubhangi J. Mane-Gavade ◽  
Sandip R. Sabale ◽  
Xiao-Ying Yu ◽  
Gurunath H. Nikam ◽  
Bhaskar V. Tamhankar
Keyword(s):  
Green Synthesis ◽  
Color Change ◽  
Limit Of Detection ◽  
Aqueous Media ◽  
Suitable Condition ◽  
Cost Effective ◽  
Spectroscopic Studies ◽  
Calibration Plot ◽  
First Time

Introduction: Herein we report the green synthesis and characterization of silverreduced graphene oxide nanocomposites (Ag-rGO) using Acacia nilotica gum for the first time. Experimental: We demonstrate the Hg2+ ions sensing ability of the Ag-rGO nanocomposites form aqueous medium. The developed colorimetric sensor method is simple, fast and selective for the detection of Hg2+ ions in aqueous media in presence of other associated ions. A significant color change was noticed with naked eye upon Hg2+ addition. The color change was not observed for cations including Sr2+, Ni2+, Cd2+, Pb2+, Mg2+, Ca2+, Fe2+, Ba2+ and Mn2+indicating that only Hg2+ shows a strong interaction with Ag-rGO nanocomposites. Under the most suitable condition, the calibration plot (A0-A) against concentration of Hg2+ was linear in the range of 0.1-1.0 ppm with a correlation coefficient (R2) value 0.9998. Results & Conclusion The concentration of Hg2+ was quantitatively determined with the Limit of Detection (LOD) of 0.85 ppm. Also, this method shows excellent selectivity towards Hg2+ over nine other cations tested. Moreover, the method offers a new cost effective, rapid and simple approach for the detection of Hg2+ in water samples.

scholarly journals New Brightener for Zn-Fe Alloy Plating from Sulphate Bath

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
B. M. Praveen ◽  
T. V. Venkatesha
Keyword(s):  
Grain Size ◽  
Metal Ion ◽  
Condensation Product ◽  
Spectroscopic Studies ◽  
Sem Images ◽  
Alloy Electrodeposition ◽  
Fine Grained ◽  
Polarization Studies ◽  
Uv Visible ◽  
Sulphate Bath

Zn-Fe alloy electrodeposition was carried out in the presence of condensation product 2-{[(1E)-(3,4-dimethoxyphenyl)methylidene]amino}-3-hydroxypropanoic acid formed between veratraldehyde and serine in acid sulphate bath. Hull cell was used for optimizing the operating parameters and bath constituents. During deposition, the potential was shifted towards cathodic direction in the presence of addition agents and brightener. The polarization studies show that deposition taking place in basic bath and optimum bath was 1.08 and 1.15 V, respectively. Current efficiency and throwing power were reached around 85% and 26%, respectively. The SEM images of bright deposit indicated its fine-grained nature and appreciable reduction in the grain size. XRD studies have showed that the grain size of the deposit generated from optimum bath was 16 nm. UV-visible spectroscopic studies confirm the formation of complex between metal ion and brightener.

pH Influences on Optical Absorption of Anthocyanin from Black Rice as Sensitizer for Dye Sensitized Solar Cell TiO2 Nanoparticles

2016 ◽  
Vol 864 ◽  
pp. 154-158
Author(s):  
Mariya Al Qibtiya ◽  
Eka Cahya Prima ◽  
Brian Yuliarto ◽  
Suyatman
Keyword(s):  
Solar Cell ◽  
Optical Absorption ◽  
Dye Sensitized Solar Cell ◽  
Black Rice ◽  
X Ray ◽  
Dye Sensitized ◽  
Current Voltage ◽  
Average Grain Size ◽  
Uv Visible

Natural dyes extracted from black rice are used as sensitizer for dye sensitized solar cell. The anthocyanin extracted with various pH in acidic and neutral coditions. Preparation of fotolectrode TiO2 film using doctor blade method and resulting average grain size 33,9 nm using X-Ray Diffractometer. Characterization of morphology and cross-section film TiO2 is confirmed by Scanning Electron microscopy (SEM). Optical absorption using UV-Visible Spectroscopy to obtain spectrum absorbance of anthocyanin in various pH. The current-voltage (J-V) characterization shows the performance DSSC have a match relation to the optical absorption. The best absorption of anthocyanin obtained at pH 6 as well as conversion efficiency reaches 2.26% at this pH condition.

Proton NMR characterization of gasoline–ethanol blends

Fuel ◽  
2014 ◽  
Vol 137 ◽  
pp. 335-338 ◽  
Author(s):  
A. Turanov ◽  
A.K. Khitrin
Keyword(s):  
Proton Nmr ◽  
Nmr Characterization ◽  
Ethanol Blends

Synthesis and proton NMR spectroscopic characterization of trans-[Pt(NH3)2[d(ApGpGpCpCpT)-N7-A(1),N7-G(3)]]

Biochemistry ◽  
1987 ◽  
Vol 26 (18) ◽  
pp. 5651-5657 ◽  
Author(s):  
Christopher A. Lepre ◽  
Kenneth G. Strothkamp ◽  
Stephen J. Lippard
Keyword(s):  
Proton Nmr ◽  
Spectroscopic Characterization
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