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

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.

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.

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.

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.

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