Near-Infrared pH Sensor Based on a SPEEK–Polyaniline Polyelectrolyte Complex Membrane

Abu-Thabit, Nedal Y.

doi:10.3390/iocn_2018-1-05493

Cited by 4 publications

(3 citation statements)

References 31 publications

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“…The negatively charged strong acidic sulfonic acid groups and the positively charged lysozyme (with an isoelectric point of 11.35) are attracted to each other by Coulombic interactions [ 34 , 35 ]. Other interactions, such as hydrogen bonding, hydrophobic interactions, and van der Waals forces, also contribute to the binding affinity between the protein and the membrane adsorber [ 35 , 36 , 37 ]. The choice of lysozyme as the model protein in this study is due to its stability, antimicrobial properties, and is a natural preservative, which makes lysozyme an ideal test molecule and is therefore widely studied [ 38 ].…”

Section: Introductionmentioning

confidence: 99%

On the Performance of a Ready-to-Use Electrospun Sulfonated Poly(Ether Ether Ketone) Membrane Adsorber

Joosten,

Wyrębak,

Schenning

et al. 2023

Membranes

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Motivated by the need for efficient purification methods for the recovery of valuable resources, we developed a wire-electrospun membrane adsorber without the need for post-modification. The relationship between the fiber structure, functional-group density, and performance of electrospun sulfonated poly(ether ether ketone) (sPEEK) membrane adsorbers was explored. The sulfonate groups enable selective binding of lysozyme at neutral pH through electrostatic interactions. Our results show a dynamic lysozyme adsorption capacity of 59.3 mg/g at 10% breakthrough, which is independent of the flow velocity confirming dominant convective mass transport. Membrane adsorbers with three different fiber diameters (measured by SEM) were fabricated by altering the concentration of the polymer solution. The specific surface area as measured with BET and the dynamic adsorption capacity were minimally affected by variations in fiber diameter, offering membrane adsorbers with consistent performance. To study the effect of functional-group density, membrane adsorbers from sPEEK with different sulfonation degrees (52%, 62%, and 72%) were fabricated. Despite the increased functional-group density, the dynamic adsorption capacity did not increase accordingly. However, in all presented cases, at least a monolayer coverage was obtained, demonstrating ample functional groups available within the area occupied by a lysozyme molecule. Our study showcases a ready-to-use membrane adsorber for the recovery of positively charged molecules, using lysozyme as a model protein, with potential applications in removing heavy metals, dyes, and pharmaceutical components from process streams. Furthermore, this study highlights factors, such as fiber diameter and functional-group density, for optimizing the membrane adsorber’s performance.

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Section: Introductionmentioning

confidence: 99%

On the Performance of a Ready-to-Use Electrospun Sulfonated Poly(Ether Ether Ketone) Membrane Adsorber

Joosten,

Wyrębak,

Schenning

et al. 2023

Membranes

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“…However, the buffer capacity of the polyelectrolyte complex is not only protection against the acidity of the medium, but also an important parameter of diagnostic systems, which must be taken into account in order to obtain reliable results. For example, Nedal Y. Abu-Thabit developed a pH-sensitive sensor whose membrane consisted of a polyelectrolyte complex and increased the response time of the system [11].…”

Section: Introductionmentioning

confidence: 99%

The Discovery of the Buffer Capacity of Various Types of Polyelectrolyte Microcapsules

et al. 2021

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Polyelectrolyte microcapsules, which are obtained by the method of alternate adsorption of oppositely charged polyelectrolytes onto colloidal particles of micron size, are widely used in science and industry. Nevertheless, the properties of microcapsules are still poorly understood. In particular, there is no information in the literature on the buffer capacity. However, information on the presence of a buffer capacity and an understanding of its mechanisms can both simplify the use of microcapsules and expand the scope of their application. In this regard, the buffer capacity of various types of microcapsules was studied. It was found that polyelectrolyte microcapsules consisting of polyallylamine, and polystyrene sulfonate have a buffer capacity. In addition, in an acidic medium, the buffer capacity of microcapsules containing BSA is significantly greater than that of microcapsules without protein. This is due to the fact that BSA contributes to the buffering of microcapsules. Differences in the behaviour of the buffer capacity of microcapsules with the composition (PAH/PSS)3 and (PSS/PAH)3 were found. In addition, a hypothesis has been proposed that regions of unbound polyallylamine are responsible for the buffering properties of polyelectrolyte microcapsules. This hypothesis is confirmed by the fact that incubation of microcapsules in 0.5 M NaCl increases the amount of unbound polyallylamine, which leads to an increase in the buffer capacity of microcapsules at alkaline pH values higher than the buffer capacity of capsules in an aqueous solution.

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“…The main requirements for preparing pH-responsive films is the safety, which means that films shall be made from safe and biocompatible materials derived from natural resources, which avoids toxicity issues that may result from leaching/ degradation of film components during the application period. Another key feature of the used packaging films is its biodegradability which has a direct impact on the safety of the environment by avoiding use of non-biodegradable materials such as pHresponsive films based on synthetic polymers [4,5]. Natural polymers have been employed for drug delivery applications and hence they are suitable for use as matrix for film packaging materials [6].…”

Section: Introductionmentioning

confidence: 99%

Optical and pH-Responsive Nanocomposite Film for Food Packaging Application

Abu-Thabit

Umar

Sadique

et al. 2019

The 6th International Electronic Conference on Sensors and Applications

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In this study, a biocompatible and non-toxic pH-responsive composite film was prepared for food packaging application. The films are composed from polyvinyl alcohol as the main polymeric matrix, nanoclay as a reinforcing component and red cabbage extract as a non-toxic indicator. The prepared films showed lower water uptake values when the amount of nanoclay was increase up to 25 %. It was observed that the films become brittle at high loading of nanoclay (40%). The prepared films exhibited color change in alkaline and acidic medium due to the presence of red cabbage extract which turned pinkish in acidic medium and greenish in alkaline environment. The prepared films were characterized by FTIR and visible spectroscopy. The maximum absorption in acidic medium was (λmax = 527 nm), while a red-shift occurred in the alkaline medium (λmax = 614 nm). Future work will focus on crosslinking of the prepared films to improve their mechanical properties.

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Near-Infrared pH Sensor Based on a SPEEK–Polyaniline Polyelectrolyte Complex Membrane

Cited by 4 publications

References 31 publications

On the Performance of a Ready-to-Use Electrospun Sulfonated Poly(Ether Ether Ketone) Membrane Adsorber

On the Performance of a Ready-to-Use Electrospun Sulfonated Poly(Ether Ether Ketone) Membrane Adsorber

The Discovery of the Buffer Capacity of Various Types of Polyelectrolyte Microcapsules

Optical and pH-Responsive Nanocomposite Film for Food Packaging Application

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