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UV Irradiation’s Influence on Fumitory Extract-Loaded Liposomes
No full textThe aim of the present study was the characterization of fumitory extract-loaded liposomal vesicles after UV irradiation via the determination of the encapsulation efficiency, size, polydispersity index (PDI), zeta potential, mobility, and conductivity. The encapsulation efficiency was the same before and after UV irradiation (>69%). The particle size and PDI of the UV-irradiated liposomes with the fumitory extract were 294.2 ± 4.1 nm and 0.387 ± 0.011, respectively. The zeta potential after UV irradiation was −5.51 ± 0.4 mV. The mobility and conductivity of the obtained liposomal particles were −0.429 ± 0.012 µmcm/Vs and 0.468 ± 0.005 mS/cm, respectively. The results indicate the existence of nanoparticles and a non-uniform system, while a negative zeta potential value is related to the organization of phospholipids. Since UV irradiation did not cause significant changes in all of the mentioned parameters of the fumitory extract-loaded liposomes, it can be employed as a sterilization step in the preparation of liposomes.The IX International Congress “Engineering, Environment and Materials in Process Industry”—EEM2025, 2-4 April 2025, Bijeljina, Bosnia and Herzegovin
The influence of preparation method on the efficiency of clay-carbon composites for detection of 4- aminoantipyrine
No full textSmectite-rich bentonite clay was used to synthesize a chitosan-smectite nanocomposite. The resulting nanocomposite underwent two carbonation procedures: air-limitation pyrolysis and hydrothermal treatment. The obtained clay-carbon composites were characterized using XRD analysis, FT-IR, and Raman spectroscopy. The point of zero charge was determined for both composites. Electrochemical characterization was performed via cyclic voltammetry and electrochemical impedance spectroscopy. The electrochemical activity of carbon paste electrodes modified with the clay-carbon composites was evaluated for 4-aminoantipyrine (4-AAP) detection in Britton-Robinson buffer (pH 3–9) using cyclic voltammetry. The sensor based on the hydrothermally synthesized composite was further tested by square wave voltammetry, achieving a sensitivity of 0.0125 μA/μM and a detection limit (LOD) of 0.4 μM. The sensor demonstrated satisfactory performance when tested in real urine samples. © 2025 Elsevier B.V
Degradation of aniline via microbial treated post Fe(II) or Co(II)/PMS advanced oxidation processes
No full textAniline, a common derivative pollutant found in non-ferrous metal(loid) tailings due to the usage of flotation reagents, is a significant residual chemical and requires remediation in tailings waste management. This research identified a Staphylococcus aureus CUGB-LJL5 as a proficient aniline-degrading bacterium isolated from tailings soil. This strain was successfully used to establish a two-step strategy of microbiological treatment followed by an advanced oxidation process (AOP) to eliminate high concentrations of aniline (1000 mg/L). The results indicate that the combined microbial AOPs technique exhibits superior efficiency in degrading aniline at high concentration of 1000 mg/L, achieving a degradation rate of 99.89% with only 1.08 mg/L remaining. Optimal conditions for this process involved the addition of 5 mM peroxymonosulfate (PMS) and 1 mM Fe(II) after inoculating with a 3% bacterial culture for 96 h at a pH of 7 and a temperature of 30°C. PCR and radical scavenger experiments suggest that the microbial phase primarily involves enzyme-mediated removal, while the subsequent AOPs phase was mainly driven by free radical (SO4•-) reactions. Three different degradation pathways are proposed based on the aniline degradation byproducts determined by GC–MS. Including the elimination of aniline by the aniline dioxase pathway during microbial degradation and promotes further mineralization by Fe(II) or Co(II)/PMS by both, hydroxylation and acetylation. Additionally, results from the cost analysis also highlight the potential and economic feasibility of the combined technology. In general, microbiological treatment post Fe(II)/PMS process is a green, efficient and economical method for remediating high concentrations of aniline in non-ferrous(loid) tailings environments
Assessment of Antioxidant Activity and Dose-Dependent Effect on Genotoxicity/Antigenotoxicity of Pulmonaria officinalis Ethanolic Extract
No full textBackground/Objectives: Pulmonaria officinalis L., commonly known as lungwort, is a medicinal plant traditionally used for respiratory ailments, but its biological activities have not yet been sufficiently researched. The aim of this study was to investigate the antioxidant and dose-dependent genotoxic/antigenotoxic properties of a 70% ethanolic extract. Methods: Quantification of polyphenols and GC–MS analysis were performed in order to chemically characterize the extract. Antioxidant activity was evaluated through DPPH, PFRAP, total antioxidant capacity (TAC), and ferrous ion chelating assay (FIC). MTT and alkaline comet assay were used for investigation of cytotoxicity and geno/antigenotoxicity on normal fetal fibroblast cells (MRC-5). Results: The chemical analysis of the extract showed that the extract is rich in polyphenolics and that phytol is the most abundant compound, accompanied by terpenoids, fatty acids, alcohols, polyketides, and alkaloids. In addition, notable antioxidant capacity was detected in all tests applied. The extract reduced cell viability only at the highest concentration tested (33.7%). Furthermore, a dual dose-dependent effect was recorded since the genotoxic effect of the tested extract was observed at higher concentrations, while non-genotoxic concentrations showed protective effects against oxidative damage of DNA. Namely, pretreatment with lungwort extract reduced the DNA damage induced by H2O2, with the highest protective effect at the lowest tested concentration, indicating a hormetic mode of action. Conclusions: These results provide a solid foundation for future research into this medicinal plant, with the aim of its potential therapeutic use in the prevention of diseases associated with oxidative stress
Supplementary Materials for: "Synthesis, characterization and electrochemical properties of cobalt-doped phosphate tungsten heteropoly acid and its bronze"
No full textHeteropoly acids and their compounds are a fascinating class of multifunctional materials for use in various fields: medicine, magnetism, catalysis and nonlinear optics, as well as for electrochemistry and battery materials. This study used tungsten-phosphate heteropoly acid to synthesize and characterize its Co doped salt (Co-PWA) and tungsten-phosphate bronze (Co-PWB). Thermal analysis was used to determine Co-PWA salt phase transition into Co-PWB bronze occurring at 588 °C. Both samples were further characterized using Fourier transform infrared spectroscopy, X-ray powder diffraction and scanning electron microscopy containing energy dispersive X-ray spectroscopy, and by use of electrochemical examinations. Cyclic voltammetry (as a rapid analytical method) showed that both materials yielded low capacities in an aqueous solution of LiNO3. However, a “slow” analytical method, chronopotentiometry, in which more places of a crystal lattice are occupied with ions (as compared to cyclic voltammetry), yielded solid and stable discharge capacity, making Co-PWB attractive as a potential electrode material for aqueous Li-ion batteries. The results obtained fill the gap in the scientific literature dealing with similar materials
Novel Alumina-Copper Electrode Composites: Toward Efficient Glutamate and H2O2 Detection
No full textAlumina is a well-known catalyst and catalyst support. The electrochemical properties of alumina have recently gained attention. The electrochemical response of alumina greatly depends on the type and number of surface groups present in different alumina types. The surfaces of two types of alumina, anhydrous (A) and trihydrate (T) alumina, were modified by copper through an ion-exchange procedure. The samples were characterized by diffuse reflectance UV–Vis spectroscopy. The obtained samples were used as modifiers of carbon paste electrodes. The electrochemical characterization of the samples was performed using cyclic voltammetry and two redox probes. The electrochemical behavior of samples was investigated in the alkaline and neutral media. The electroanalytical performance of the synthesized composites was tested on glutamate and hydrogen peroxide by linear sweep voltammetry. The functionalization of alumina with copper by ion exchange offered a fast and cost-effective procedure for obtaining a composite with enhanced electrochemical properties for sensing biologically important analytes. © 2025 by the authors
Theophylline electrochemical sensing in pharmaceutical drugs using disposable boron-doped diamond thin film electrodes
No full textThe main idea of this work was to investigate the voltammetric behavior of theophylline using cyclic voltammetry (CV), and to compare differential pulse voltammetry (DPV) and square wave voltammetry (SWV) for application in the development of a method for this analyte. The electrochemical results indicate that the homely printed sensor with a boron doped diamond electrode can significantly improve the electrocatalytic activity towards the oxidation of theophylline in 0.5 M sulfuric acid. After parameter optimization and comparison of the DPV and SWV methods, it was shown that both methods can effectively detect theophylline in the same concentration range from 3.8 to 27 µM. Slightly better analytical parameters in terms of detection limit and quantification limit were obtained by the SWV method and were 0.24 µM and 0.73 µM, respectively. In the case of DPV, the detection limit was 0.39 µM, while the quantification limit was at a value of 1.17 µM. The practical applicability was demonstrated through the development of the SWV method for the detection of theophylline in pharmaceutical formulations. The tests were performed in triplicate and using the standard addition method. Excellent agreement with the declared values showed that the proposed sensor can be a satisfactory alternative for fast, precise and accurate monitoring of theophylline concentration in real samples, with great potential for further modification and technology transfer for miniaturization and disposable sensing
Optimization of Orange G sorption using GMA-based polymer through response surface methodology and box-behnken design
No full textVarious industries, including textile, food, cosmetic, and pharmaceutical sectors, widely
use dyes due to their low cost and broad spectrum. Orange G (OG), an anionic dye, poses serious
risks to both aquatic ecosystems and human health; it disrupts photosynthesis by reducing light
penetration in water and is toxic to plants, animals, and microorganisms. Among humans, exposure
to OG dye can cause skin irritation, respiratory and gastrointestinal issues, and has been linked to
genotoxic and potentially carcinogenic effects. Adsorption is an effective method for dye removal,
while the GMA-based polymer is particularly suitable as a sorbent due to its highly reactive epoxy
functional groups. This study investigated the effect of three factors: sorbent dose (5–10 g/L), contact
time (10–20 min), and initial OG dye concentration (40–80 mg/L) on the sorption capacity using
GMA-based polymer. The influence of these parameters on the sorption capacity of OG dye removal
was optimized using response surface methodology (RSM) based on the Box–Behnken Design (BBD).
The optimal conditions provided by RSM indicated sorbent dose of 7.5 g/L, contact time of 15 min
and concentration of OG dye of 60 mg/L resulting in maximum sorption efficiency of 94 %
The effect of Na2WO4 on the Briggs-Rauscher oscillatory reaction: catalytic activity research
No full textThe Briggs-Rauscher (BR) is a well-known chemical oscillatory system. It is interesting because the oscillatory dynamics occur at room temperature and its sensitivity towards different perturbators. Our previous work was related to the testing of insoluble materials, such as phosphate tungsten bronzes. In this work, the addition of different concentrations of sodium tungstate
Na2WO4 in the BR reaction is investigated. The Na2WO4 has multifaced application. It acts as a fluxing agent in the glass and ceramics industry. Sodium tungstate significantly influences the oscillatory dynamics. The effect of Na2WO4 is more pronounced on the length of the BR oscillation
time, then on the amplitude of oscillations. This behavior could be related to the catalytic influence of tungsten ion on hydrogen-peroxide decomposition reaction via metal peroxo complex catalysis
Supplementary data for the article: NADES-Based Preparation of Nd-TiO2/Oxygen Doped-g-C3N4 Heterojunction with Enhanced Photocatalytic Performances: Experimental Investigation with Theoretical Explanation.
No full textSupplementary material for: [https://doi.org/10.1016/j.jwpe.2025.108786]Related to published version: [https://cer.ihtm.bg.ac.rs/handle/123456789/8802]Related to accepted version: [https://cer.ihtm.bg.ac.rs/handle/123456789/9068