Characterising the chemical interactions that occur on polyaniline with inverse thin layer chromatography

Teasdale, Peter R.; Wallace, Gordon G.

doi:10.1002/pi.1994.210350210

Cited by 17 publications

(3 citation statements)

References 13 publications

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“…This type of study helps to explain the affinity differences found in the whisky experiment mentioned above. Several studies indicate there is an effect of pH on the properties and structure of PANI. − PANI-EB and -ES are very sensitive to environments with different pH values; this produces changes in the backbone of both PANI forms due to protonation and deprotonation of the imine nitrogen of the quinoid segment . The pH of whisky is 4.43, and when PANI-EB (Figure a) was mixed with whisky, its pH was increased to 4.94, which suggests that the imine nitrogens were partially protonated (Figure b).…”

Section: Resultsmentioning

confidence: 99%

“…49−51 PANI-EB and -ES are very sensitive to environments with different pH values; this produces changes in the backbone of both PANI forms due to protonation and deprotonation of the imine nitrogen of the quinoid segment. 52 The pH of whisky is 4.43, and when PANI-EB (Figure 10a) was mixed with whisky, its pH was increased to 4.94, which suggests that the imine nitrogens were partially protonated (Figure 10b). On the other hand, when PANI-ES (Figure 10a) was mixed with whisky, the pH of the solution was decreased to 3.75, which suggests that the imine nitrogens of PANI-ES were partially deprotonated (Figure 10b) when it was subjected to a low pH environment.…”

Section: Affinity Of Polyaniline-based Materials Toward Tcamentioning

confidence: 99%

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Polyaniline Based Materials as a Method to Eliminate Haloanisoles in Spirits Beverages

Valdés

Maricán

Ávila-Salas

et al. 2018

Ind. Eng. Chem. Res.

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In this research, the abilities of two polyanilinebased materials (PANI-EB and PANI-ES) were evaluated as potential fining agents to eliminate 2,4,6-trichloroanisole (TCA) and 2,4,6-tribromoanisole (TBA). The results showed that the retention percentages of TCA and TBA were higher than 68% for all the materials tested in methanol, and they vary according to the interaction time and the quantity of polymer used. The polymers were also tested in whisky following the same procedures and considering the results obtained in the methanol tests. The analyses indicated that polyaniline-based materials are effective in removing TBA and TCA, with retention percentages around 75% and 13%, respectively. Electronic structure calculations and molecular dynamics simulations helped to gain insight on the behavior of the PANI polymers in methanol and simulated whiskey solution (ethanol/water) and their interactions with each haloanisole. Finally, the main compounds present in the whisky were characterized in order to demonstrate that the purification process did not modify significantly the aromatic profile of the product and the total phenolic content.

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Section: Resultsmentioning

confidence: 99%

Section: Affinity Of Polyaniline-based Materials Toward Tcamentioning

confidence: 99%

Polyaniline Based Materials as a Method to Eliminate Haloanisoles in Spirits Beverages

Valdés

Maricán

Ávila-Salas

et al. 2018

Ind. Eng. Chem. Res.

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“…Each chain was separated by a distance of at least 5 Å, to give PANI‐EB and PANI‐ES spherical nanoparticles of 90 Å diameter. The emeraldine forms (base and salt) of PANI are sensitive to pH change (Lindfors and Ivaska , Patil et al , Tanwar and Ho ), which produces changes in the backbone because of the imine nitrogen located in the quinoid segment (INQS) undergoing protonation or deprotonation (Teasdale and Wallace ). Therefore, three different PANI‐EB nanoparticles were built in order to simulate the environments in methanol solution (0% protonated INQS), whisky (50% protonated INQS) and red wine (75% protonated INQS).…”

Section: Methodsmentioning

confidence: 99%

Simple approach for cleaning up 2,4,6‐trichloroanisole from alcoholic‐beverage‐reconstituted solutions using polymeric materials

Valdés

Maricán

Ávila-Salas

et al. 2019

Australian Journal of Grape and Wine Research

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Background and Aims 2,4,6‐Trichloroanisole (TCA) is a well‐recognised contaminant in the wine and whisky industries. In this work, several polymeric materials were tested through a hybrid strategy (computational and experimental studies) as potential fining agents for elimination of TCA. Methods and Results Sodium alginate, polyaniline emeraldine base (PANI‐EB), polyaniline emeraldine salt (PANI‐ES) and three cross‐linked derivatives of different generations (G3, G4 and G5) of polyamidoamine (PAMAM) were tested. Materials were characterised by Fourier transform infrared spectroscopy and thermogravimetric analysis. The amount of material and the interaction time needed to achieve TCA sorption were optimised in a screening study. The binding capacity of the materials was then determined in methanol‐reconstituted wine and whisky solutions to demonstrate their effectiveness. The proportion of TCA in wine retained by PANI‐ES, PANI‐EB and PAMAM‐G5‐CD was greater than 75%, and for whisky all polymers except PANI‐ES retained greater than 75% of TCA. The concentration of phenolic substances of both methanol‐reconstituted solutions was measured after treatment; most of the polymers had no impact on the concentration of phenolic substances. The intermolecular interactions between the polymeric materials and TCA were characterised by computational studies involving molecular dynamics simulations. Conclusions The polymers PAMAM G5‐CD and PANI‐EB retained the most TCA in reconstituted red wine and whisky solutions. Significance of the Study The provision of efficient materials for the removal of TCA will improve the purification processes employed in beverage production.

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Conductive Polymers

Wallace

Lewis

Kane‐Maguire

2002

Encyclopedia of Smart Materials

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Intelligent polymer systems have the capacity to sense a variety of stimuli in the operational environment. They can further process this information and then actuate responses. The stimuli utilized may be chemical (e.g., chemical imbalance in a living system) or physical (e.g., structure exceeds a stress limit). Likewise the response actuated may be chemical (e.g., controlled release of drugs) or physical (e.g., increase in stiffness of material). The intelligent polymer structure will require energy to implement these functions, so energy conversion/storage capabilities are desirable. These latter functions could be achieved, for example, by utilizing the photovoltaic properties of polymer structures. Ideally, all of the above mentioned functions would be integrated at the molecular level. While a number of classes of polymers are capable of providing one or more intelligent functions, inherently conducting polymers (ICPs) may provide all of them. Synthesis and properties of these polymers are detailed. Their use as sensors, information processors and actuators are discussed as is the possiblity of providing an energy conversion and storage stystem.

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Characterising the chemical interactions that occur on polyaniline with inverse thin layer chromatography

Cited by 17 publications

References 13 publications

Polyaniline Based Materials as a Method to Eliminate Haloanisoles in Spirits Beverages

Polyaniline Based Materials as a Method to Eliminate Haloanisoles in Spirits Beverages

Simple approach for cleaning up 2,4,6‐trichloroanisole from alcoholic‐beverage‐reconstituted solutions using polymeric materials

Conductive Polymers

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