scholarly journals Highly Selective Hg (II) Ion Detection Based on Linear Blue-Shift of the Maximum Absorption Wavelength of Silver Nanoparticles

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Li Ping Wu ◽  
Hua Wen Zhao ◽  
Zhu Hong Qin ◽  
Xian Ying Zhao ◽  
Wen Dan Pu
Keyword(s):  
Silver Nanoparticles ◽  
Detection Limit ◽  
Color Change ◽  
Blue Shift ◽  
Ion Concentration ◽  
Maximum Absorption ◽  
Experimental Conditions ◽  
Selective Method ◽  
Maximum Absorption Wavelength ◽  
Absorption Wavelength

A new method of detecting Hg (II) ion with silver nanoparticles (AgNPs) is developed in this contribution. When Hg (II) ions were added into AgNPs solution, the solution displayed rapid color change and blue shift of the maximum absorption wavelength (Δλ), which was in proportion to the Hg (II) ion concentration over the range of 2.0 × 10−7–6.0 × 10−6 mol/L, with detection limit (3σ) of 6.6 × 10−9 mol/L. Under the same experimental conditions, other metal ions did not interfere. Thus, we propose a rapid, simple and highly selective method for detecting Hg (II) ion.

Investigating the Interaction of Ninhydrin with Amino Acids and Polypeptide

2014 ◽  
Vol 955-959 ◽  
pp. 395-398
Author(s):  
Shu Yuan Hu ◽  
Hui Qing Li ◽  
Lian Wei Yu ◽  
Fu Li Tian
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Detection Limit ◽  
Linear Relationship ◽  
Maximum Absorption ◽  
Good Linear ◽  
Good Linear Relationship ◽  
Ninhydrin Reaction ◽  
Maximum Absorption Wavelength ◽  
Absorption Wavelength

Ninhydrin chromogenic reactions are widely used to analyze and characterize amino acids, peptides, and proteins. In this study, the spectroscopy behavior of ninhydrin reaction with mercapto amino acid and polypeptide has been investigated. The maximum absorption wavelength of glutathione reaction with ninhydrin was 568 nm; the maximum absorption wavelength of cysteine reaction with ninhydrin was 457 nm. Under the optimized wavelength condition, glutathione and cysteine in the certain concentration range exhibt good linear relationship and low detection limit.

scholarly journals SPECTROPHOTOMETRIC DETERMINATION OF PYROCATHECOL AND PYROGALLOL BASED ON THEIR REDOX REACTION WITH IRON(III)/PHENANTHROLINE SYSTEM

2010 ◽  
Vol 2 (3) ◽  
pp. 161-166 ◽  
Author(s):  
Mudasir Mudasir ◽  
Mugiyanti Mugiyanti ◽  
Ngatidjo Hadipranoto
Keyword(s):  
Phenolic Compounds ◽  
Redox Reaction ◽  
Heating Temperature ◽  
Heating Time ◽  
Maximum Absorption ◽  
Optimum Conditions ◽  
Phenanthroline Complex ◽  
Maximum Absorption Wavelength ◽  
Absorption Wavelength

An analytical method for the spectrophotometric determination of some phenolic compounds, i.e.: pyrocathecol and pyrogallol based on their redox reaction with iron(III)-phenanthroline complex has been developed. These two compounds, in appropriate conditions, reduce iron(III)-phenanthroline complex to yield very stable and color-intense complex of iron(II)-phenanthroline, [Fe(phen)2]2+, whose concentration is equivalent to the amount of pyrocathecol or pyrogallol in the solution, and is easily detected by spectrophotometric method. Some parameters influencing the sensitivity of the determination were optimized. These included maximum absorption wavelength, pH of the solution, time and temperature of heatingand reagent to analyte minimum mole-ratio. Using the optimum conditions obtained, the analytical performance of the method was examined and the developed method was then applied to analyzed pyrocathecol and pyrogallol contents in several river water of Yogyakarta, Indonesia. Result of the study showed that the optimum conditions for the determination of pyrocathecol are as follows: maximum absorption wavelength (lmax) at 510 nm, pH of the solution = 4, heating time = 120 min, heating temperature = 70 0C and the minimum mole ratio of reagent to analyte is 8. On the other hand, the optimum conditions for the determination of pyrogallol are as follows: maximum absorption wavelength (lmax) at 510 nm, pH of the solution = 5, heating time = 90 min, heating temperature = 90 0C and the minimum mole ratio of reagent to analyte is 7. At the corresponding conditions of analysis, calibration curves for pyrocathecol and pyrogallol are linear in the range concentration of 0.00 - 0.16 ppm and 0.00 - 0.24 ppm, respectively. The correlation coefficients for both compounds were found to be higher than 0.998 and the detection limits went down below 0.07 ppm. It has been demonstrated that the developed method can be applied for the determination of pyrocathecol and pyrogallol contents in natural samples.   Keywords: Spectrophotometry, phenolic compounds, 1,10-phenanthroline, redox reaction

Study on Determination of Glucose in Amylofermentation Liquid Using Ultraviolet Spectrophotometry

2012 ◽  
Vol 538-541 ◽  
pp. 2434-2437 ◽  
Author(s):  
Bao Shan He ◽  
Na Gao ◽  
Fang Wei ◽  
Qi Yu Lu
Keyword(s):  
Hydrogen Peroxide ◽  
Glucose Oxidase ◽  
Optical Method ◽  
Maximum Absorption ◽  
Ultraviolet Spectrophotometry ◽  
Titanyl Oxalate ◽  
Maximum Absorption Wavelength ◽  
Absorption Wavelength

In the presence of glucose oxidase, glucose in samples was oxygenated to hydrogen peroxide, the solution turned from colourless to yellow upon the reaction of potassium titanyl oxalate to the generated hydrogen peroxide. Using ultraviolet spectrophotometry, a new optical method for detecting glucose in amylofermentation liquid has been established. Results demonstrated that glucose concentrations were proportional to absorbance at the maximum absorption wavelength of 380 nm. A favorable linearity was presented in the range of 1 mmol/L to 60 mmol/L. The linear coeffciency was 0.993. This method was simple, reliable, and could be used for determing glucose in samples.

scholarly journals Schiff Base Anchored with Silver Nanoparticles as Effective Adsorbent for Removal of Cadmium(II) Heavy Metal from Industrial Wastewater

2020 ◽  
Vol 32 (8) ◽  
pp. 1941-1946
Author(s):  
Preeti Sharma ◽  
Vedula Uma
Keyword(s):  
Silver Nanoparticles ◽  
Schiff Base ◽  
Contact Time ◽  
Industrial Wastewater ◽  
Metal Ion ◽  
Solid Phase ◽  
Chemical Reduction ◽  
Ion Concentration ◽  
Spectral Studies ◽  
Experimental Conditions

The current study deals with the examination of the capacity of Schiff base anchored with silver nanoparticles for removal of cadmium(II) ions from industrial wastewater. Schiff base was synthesized using refluxing of salicylaldehyde and 4-aminoantipyrine in alcoholic medium. The characterization of Schiff base were studied by elemental analysis, FTIR, NMR, UV-visible and mass spectral studies. The silver nanoparticles were synthesized using the chemical reduction method and characterized. Then, silver nanoparticles anchored to the Schiff base by suitable method and again characterized. Peanut shells were used as solid phase for removal of Cd(II) ions. The effects of several parameters to optimize the adsorption of Cd(II) ions on solid phase, including pH, contact time, initial metal ion concentration and adsorbent weight were investigated. The maximum removal efficiency of Cd(II) ions on solid phase using Ag nano@Schiff base was achieved under experimental conditions of pH 6 (% removal = 81%), contact time of 15 min (% removal = 93%), initial metal ion concentration of 0.5 ppm (% removal = 95%) and adsorbent weight of 3 mg (% removal = 89%). The results showed that extraction of Cd2+ on AgNPs@Schiff base follows Freundlich adsorption isotherm.

Theoretical calculation of the maximum absorption wavelength for Cyanidin molecules with several methodologies

2015 ◽  
Vol 1067 ◽  
pp. 129-134 ◽  
Author(s):  
Nora-Aydee Sanchez-Bojorge ◽  
Luz-Maria Rodriguez-Valdez ◽  
Daniel Glossman-Mitnik ◽  
Norma Flores-Holguin
Keyword(s):  
Theoretical Calculation ◽  
Maximum Absorption ◽  
Maximum Absorption Wavelength ◽  
Absorption Wavelength

The Interaction between Reactive Dye and Octyl Trimethyl Ammonium Chloride

2013 ◽  
Vol 781-784 ◽  
pp. 2712-2715
Author(s):  
Yu Kun Si ◽  
Jian Feng Zhou ◽  
Li Yuan Qu ◽  
Ling Zhong ◽  
Feng Xiu Zhang ◽  
...  
Keyword(s):  
Particle Size ◽  
Ammonium Chloride ◽  
Reactive Dyes ◽  
Reactive Dye ◽  
Maximum Absorption ◽  
Trimethyl Ammonium Chloride ◽  
Dye Molecules ◽  
Maximum Absorption Wavelength ◽  
Dye Molecule ◽  
Absorption Wavelength

Octyl trimethyl ammonium chloride (OTMAC) is a very efficient accelerant for reactive dyes on dyeing silk. In order to understand the accelerating mechanism, the interaction between dye molecules and OTMAC molecule was studied in this paper. The results showed that the DTMAC made the dye molecules assembled and the particle size of dye assemblages could reach to more than 500nm. The assembling of dye molecules leads to increase of the maximum absorption wavelength of dye. The higher the temperature is, the weaker the interaction between dye molecule and accelerant.

Ultrasensitive Chemiluminescence Detection of Indoleacetic Acid Catalyzed by Silver Nanoparticles

2011 ◽  
Vol 306-307 ◽  
pp. 1440-1443 ◽  
Author(s):  
Wen Wen Liu ◽  
Wei Hua Liu ◽  
Xue Min Mu ◽  
Pi Xue Gong ◽  
Wei Cao
Keyword(s):  
Silver Nanoparticles ◽  
Detection Limit ◽  
Flow Injection ◽  
Indoleacetic Acid ◽  
Optimum Conditions ◽  
Chemiluminescence Detection ◽  
Experimental Conditions ◽  
Acid Catalyzed ◽  
Flow Injection Chemiluminescence

A flow injection chemiluminescence (CL) method has been developed for the determination of indoleacetic acid (IAA). It is based on the fact that the weak CL of Ce(IV)-Ru(phen)32+ system is strongly enhanced in the presence of silver nanoparticles. Optimum conditions and possible mechanisms have been investigated. Under optimum experimental conditions, the linear range is from 1.0×10-8 – 6.0×10-7 g mL-1 with a detection limit 9.0×10-9 g mL-1

2-chloromethyl-5-aryl-1,3,4-oxadiazole Synthesis and Properties of Compounds

2012 ◽  
Vol 554-556 ◽  
pp. 768-771
Author(s):  
Xiong Lu Zhang ◽  
Qiu Yan Qin ◽  
Yi Ping Qian ◽  
Hong Xiao
Keyword(s):  
Thermal Stability ◽  
Fluorescence Spectroscopy ◽  
Oxidation Resistance ◽  
Fluorescence Emission ◽  
Maximum Absorption ◽  
Blue Fluorescence ◽  
Excellent Thermal Stability ◽  
Ft Ir ◽  
Maximum Absorption Wavelength ◽  
Absorption Wavelength

1,3,4-oxadiazole(OXD) and its derivatives have excellent thermal stability and oxidation resistance and strong blue fluorescence emission[1].Six novel compounds have been designed and and synthesized. And their structures were confirmed by 1HNMR,FT-IR MS, UV-vis absorption results showed that the maximum absorption wavelength appeared at 304 nm，and fluorescence spectroscopy results showed that they emit strong purple fluorescence in DMF solution.

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