Bray–Liebhafsky oscillatory reaction as the matrix system for the kinetic determination of microquantities of alizarin and purpurin
| Autor: | Željko Čupić, Slobodan Anić, Aleksandra Đerić, Jelena Maksimović, Ljiljana Kolar-Anić, Nedeljko Manojlović |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Rubia tinctorum
Mechanism of interaction Inorganic chemistry Microquantitative determination of alizarin and purpurin 010402 general chemistry Kinetic energy Alizarin 01 natural sciences Catalysis Pigment chemistry.chemical_compound Bray–Liebhafsky oscillatory reaction as the matrix system Extraction of alizarin and purpurin from roots of Rubia tinctorum Kinetic determination of alizarin and purpurin Physical and Theoretical Chemistry biology 010405 organic chemistry Chemistry biology.organism_classification Oscillatory reaction 0104 chemical sciences visual_art visual_art.visual_art_medium Reaction system Dyeing |
| Zdroj: | Reaction Kinetics, Mechanisms and Catalysis |
| Popis: | Two hydroxyanthraquinones, alizarin and purpurin, that have been used throughout history as a natural pigment, were extracted from roots of Rubia tinctorum from Serbia. As substances with important chemical activities and, therefore, with wide applications (for example in dyeing textile fabrics as well as in pharmacy because of their anti-inflammatory, anti-cancer, antiviral, antimicrobial and antioxidant activities, etc.) they were analyzed in the kinetically very sensitive Bray–Liebhafsky (BL) oscillatory reaction. However, although they are both, hydroxyanthraquinones it is shown that their interactions with BL nonlinear reaction system differ significantly. Consequently, two different reactions were used to explain the mechanism of their chemical activities. The numerical simulations based on a standard model of the BL oscillatory reaction together with proposed reactions due to alizarin/purpurin interactions with a matrix are correlated with experimental investigations. Moreover, it is shown that very small amounts of alizarin and purpurin (from about 1 × 10–7 M) produce the response of the BL matrix such that micro-quantitative analysis based on the BL oscillatory reaction can be successfully performed in this reaction system. The linear response of the BL matrix on the presence of alizarin and purpurin (necessary for microquantitative determination) is analyzed as a function of two concentration sensitive parameters: pre-oscillatory period τ1 and potential shift after perturbation ΔE. |
| Databáze: | OpenAIRE |
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