Study on Electrochemical Fingerprints and Identification of Different Varieties of Rice and Mouldy Rice by B-Z Oscillation Reaction System

2013 ◽  
Vol 25 (5) ◽  
pp. 1271-1277 ◽  
Author(s):  
Yongling Li ◽  
Cong Li ◽  
Wen Chen ◽  
Mingxiao Zhang
Keyword(s):  
Reaction System ◽  
Oscillation Reaction

scholarly journals Chlorine Dioxide-Iodide-Methyl Acetoacetate Oscillation Reaction Investigated by UV-Vis and Online FTIR Spectrophotometric Method

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Laishun Shi ◽  
Xiaomei Wang ◽  
Na Li ◽  
Jie Liu ◽  
Chunying Yan
Keyword(s):  
Induction Period ◽  
Chlorine Dioxide ◽  
Spectrophotometric Method ◽  
Ph Value ◽  
Great Influence ◽  
Reaction System ◽  
Oscillatory Behavior ◽  
Methyl Acetoacetate ◽  
Oscillation Reaction ◽  
Online Ftir

In order to study the chemical oscillatory behavior and mechanism of a new chlorine dioxide-iodide ion-methyl acetoacetate reaction system, a series of experiments were done by using UV-Vis and online FTIR spectrophotometric method. The initial concentrations of methyl acetoacetate, chlorine dioxide, potassium iodide, and sulfuric acid and the pH value have great influence on the oscillation observed at wavelength of 289 nm. There is a preoscillatory or induction period, and the amplitude and the number of oscillations are associated with the initial concentration of reactants. The equations for the triiodide ion reaction rate changing with reaction time and the initial concentrations in the oscillation stage were obtained. Oscillation reaction can be accelerated by increasing temperature. The apparent activation energies in terms of the induction period and the oscillation period were 26.02 KJ/mol and 17.65 KJ/mol, respectively. The intermediates were detected by the online FTIR analysis. Based upon the experimental data in this work and in the literature, a plausible reaction mechanism was proposed for the oscillation reaction.

The Effect of Caulophyllum robustum on the Oscillation System

2013 ◽  
Vol 303-306 ◽  
pp. 2708-2712
Author(s):  
Wei Wei Zhao ◽  
Dai Huo Liu ◽  
Jin Quan Gao ◽  
Zong Xiao Li
Keyword(s):  
Herbal Medicine ◽  
Chinese Herb ◽  
Reaction System ◽  
Oscillation System ◽  
Oscillation Reaction ◽  
Caulophyllum Robustum ◽  
Herb Medicine ◽  
Chinese Herb Medicine

The oscillation behavior was investigated in oscillation reaction system acetone-KBrO3-MnSO4-H2SO4 with Chinese herb medicine Caulophyllum Robustum as substrate. The effects of concentration of substrate, H2SO4, KBrO3, Mn2+ on the period, amplitude and life of oscillation were discussed and the action of each substance in the oscillation system was verified. It provided a new way for herbal medicine identification.

The Effect of Panax japonicus C. A. Mey. var.major (Burk.) C. Y. Wu et K. M. Feng on the Oscillation System

2013 ◽  
Vol 368-370 ◽  
pp. 826-829
Author(s):  
Jian Lan Suo ◽  
Wei Wei Zhao ◽  
Dai Huo Liu ◽  
Xiao Dong Han ◽  
Jiao Liu ◽  
...  
Keyword(s):  
Herbal Medicine ◽  
Chinese Herb ◽  
Reaction System ◽  
Oscillation System ◽  
Oscillation Reaction ◽  
Panax Japonicus ◽  
Herb Medicine ◽  
Chinese Herb Medicine

s: We have studied the oscillation behavior of Chinese herb medicine Panax japonicus C. A. Mey. var.major (Burk.) C. Y. Wu et K. M. Feng in oscillation reaction system acetone-KBrO3-MnSO4-H2SO4. Also discussed the effects of concentration of substrate, H2SO4, KBrO3, Mn2+ on the period, amplitude and life of oscillation. The action of each substance in the oscillation system was verified. It provided a new way for herbal medicine identification.

Belousov-Zhabotinskii reaction with ethyl ester of 3-oxobutanoic acid

1983 ◽  
Vol 48 (11) ◽  
pp. 3229-3237 ◽  
Author(s):  
Ľudovít Treindl ◽  
Arpád Nagy
Keyword(s):  
Carbon Dioxide ◽  
Ethyl Ester ◽  
Platinum Electrode ◽  
Reaction System ◽  
Bromo Derivative ◽  
Oscillation Reaction ◽  
Oxobutanoic Acid ◽  
Belousov Zhabotinskii Reaction

The modified Belousov-Zhabotinskii oscillation reaction with ethyl ester of 3-oxobutanoic acid is remarkable in that it does not yield carbon dioxide and the reaction system is closed and homogeneous until an emulsion of a bromo derivative of the substrate appears. As long as the system is homogeneous, it oscillates even in the motionless state and its oscillation behaviour in the absence of oxygen is independent of the intensity of stirring. The results obtained by polarography with a rotating platinum electrode are in agreement with those obtained by spectrophotometry.

PENGGUNAAN AIR SUPER KRITIS PADA DEPOLIMERISASI NYLON-12 (BATCH PROCESS)

2018 ◽  
Vol 5 (3) ◽  
Author(s):  
Mohamad Yusman
Keyword(s):  
Supercritical Water ◽  
Scale Up ◽  
Experimental Studies ◽  
Reaction System ◽  
Batch Process ◽  
Chemical Recycling ◽  
Water Decomposition ◽  
Product Distributions ◽  
New Process ◽  
Nylon 12

Water at the supercritical state is a new process for the chemical recycling. At this thermodynamic state i.e. Pc = 218 atmospheres and Tc = 374oC , water behaves very differently from its everyday temperament and it is a very good solvent for organic components. Experimental studies show that supercritical water can decompose hydrocarbons/polymers and produce useful products like 2-Azacyclotridecanone /lactam-1 from Nylon-12 (batch process). The decomposition process itself was carried out in batch reaction system in order to get more information about product distributions, time dependence, and scale-up possibilities.Keywords: supercritical water, decomposition, batch, polymer, hydrocarbon

Optimization for ISSR-PCR reaction system of tea plant

2010 ◽  
Vol 36 (4) ◽  
pp. 414-417
Author(s):  
Jing NING ◽  
Jian-an HUANG ◽  
Juan LI ◽  
Xing-gang ZHONG ◽  
Qi ZHU
Keyword(s):  
Reaction System ◽  
Tea Plant ◽  
Issr Pcr

Establishment and optimization of ISSR-PCR reaction system for endophytic fungi of Huperzia crispata

2013 ◽  
Vol 38 (4) ◽  
pp. 398-403
Author(s):  
Yun-feng SHI ◽  
Li-jun YU ◽  
Zhong-hua LIU ◽  
Huang HUANG ◽  
Jin-hua XU ◽  
...  
Keyword(s):  
Endophytic Fungi ◽  
Reaction System ◽  
Issr Pcr

Polymer-Bound Triphenylphosphine and 4,4′-Dinitroazobenzene as a Coupling Reagents for Chromatography-Free Esterification Reaction

2019 ◽  
Vol 16 (7) ◽  
pp. 1024-1031
Author(s):  
Diparjun Das ◽  
Kalyani Rajkumari ◽  
Lalthazuala Rokhum
Keyword(s):  
Microwave Irradiation ◽  
Solid Phase ◽  
Reaction System ◽  
Triphenylphosphine Oxide ◽  
High Yield ◽  
Sustainable Chemistry ◽  
Esterification Reaction ◽  
Coupling Reagent ◽  
Simple Filtration ◽  
Esterification Reactions

Aim and Objective: Sustainable production of fine chemicals both in industries and pharmaceuticals heavily depends on the application of solid-phase synthesis route coupled with microwave technologies due to their environmentally benign nature. In this report, a microwave-assisted esterification reaction using polymer-bound triphenylphosphine and 4,4′-dinitroazobenzene reagent system was investigated. Materials and Methods: The solvents were obtained from Merck India. Polymer-bound triphenylphosphine (~3 mmol triphenylphosphine moiety/g) was acquired from Sigma-Aldrich. The progress of the reaction was observed by thin-layer chromatography. All the reactions were performed in Milestones StartSYNTH microwave. The NMR spectra were recorded on Bruker Avance III 300, 400, and 500 MHz FT NMR Spectrometers. Using azo compound and polymer-bound triphenyl phosphine as a coupling reagent, esterification of different carboxylic acids with alcohols was performed under microwave irradiation. Results: Esterification of benzoic acid with 1-propanol under microwave irradiation gave a high yield of 92% propyl benzoate in 60 minutes only. Isolation of the ester products was relatively simple as both the byproducts polymer-bound triphenylphosphine oxide and hydrazine could be removed by simple filtration. The rates of reactions were found to be directly proportional to the pKa of the benzoic acids. Conclusion: 4,4′-Dinitroazobenzene was introduced as a novel coupling reagent, in conjugation with polymer-bound triphenylphosphine, for esterification reactions under microwave irradiation. The low moisture sensitivity of the reaction system, easy separation of the byproducts, and column chromatographyfree isolation of esters help our methods with application significance, particularly from the ‘Sustainable Chemistry’ perspective.

Belousov–Zhabotinskii type oscillation reaction with glycerol and kinetics of reactions between the system components

1987 ◽  
Vol 52 (10) ◽  
pp. 2375-2382 ◽  
Author(s):  
Ľubica Adamčíková ◽  
Peter Ševčík
Keyword(s):  
Oscillation System ◽  
Chemical Oscillations ◽  
Oscillation Reaction ◽  
Reaction Solution ◽  
System Components ◽  
Probable Source ◽  
Belousov Zhabotinskii Reaction ◽  
Kinetics Of ◽  
Hydrolysis Of ◽  
Type Oscillation

Glycerol causes chemical oscillations in Belousov-Zhabotinskii reaction in a closed system as well as in a reaction solution bubbled with nitrogen. Since the oxidation of glycerol with bromate ions does not proceed autocatalytically and bromine in the oxidation state 0 or +1 in the absence of light does not react with glycerol, hydrolysis of bromine is the probable source of bromide ions in the studied oscillation system.

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