M. Al-Shwaiyat, A. Vishnikin, A. Kharadzha, Y. Bazel. A non-extraction sequential injection method for determination

of loratadine using formation of its ion-association complex with bromocresol purple in acetonitrile. Talanta 272 (2024)

125844. https://doi.org/10.1016/j.talanta.2024.125844 IF 2023 6.1, Q1. Počet ohlasov 4

A. Skok, Y. Bazel, A. Vishnikin, J. Toth. Direct immersion single-drop microextraction combined with fluorescence

detection using an optical probe. Application for highly sensitive determination of rhodamine 6G. Talanta 269 (2024)

125511. https://doi.org/10.1016/j.talanta.2023.125511 IF 2023 6.1, Q1. Počet ohlasov 8

A.-E. Tamen, A. Vishnikin. In-vessel headspace liquid-phase microextraction. Anal. Chim. Acta. 1172 (2021) 338670

https://doi.org/10.1016/j.aca.2021.338670 IF 6.558, Q1.Počet ohlasov 23

A. Vishnikin, M. Hedjazi, M. Al-Shwaiyat, A. Skok, Y. Bazel. Consecutive spectrophotometric determination of

phosphate and silicate in a sequential injection lab-at-valve flow system. Analytica Chimica Acta 1273 (2023) 341464.

https://doi.org/10.1016/j.aca.2023.341464 IF 2022 6.91, Q1. Počet ohlasov 6

A. Vishnikin, A.-E. Tamen, D. Fedoseenko, Y. Bazel. In-trap headspace liquid-phase microextraction for highly

sensitive spectrophotometric determination of bromide in water samples. Analytica Chimica Acta 1382 (2026) 344832.

https://doi.org/10.1016/j.aca.2025.344832 IF 6.0, Q1. Počet ohlasov 0

APVV-24-0235 Advancing green microextraction techniques: using natural and bio-based solvents

This project proposes the integration of environmentally friendly solvents—natural deep eutectic solvents and bio-based solvents—into two advanced microextraction techniques: micro-cloud point extraction (MCPE) and dispersive liquid-liquid microextraction (DLLME). These approaches are designed to enhance the sustainability and efficiency of sample preparation in analytical chemistry while reducing environmental impact. The study aims to evaluate and compare the performance of MCPE and DLLME in extracting and preconcentrating diverse analytes, including heavy metals, pesticides, pharmaceuticals, and organic pollutants, from complex matrices such as biological fluids, food, environmental samples, pharmaceuticals, and industrial effluents. Optimization of extraction parameters will be conducted for each analyte and detection technique, employing chromatographic, spectrometric, and electroanalytical methods. By eliminating heating steps and minimizing organic solvent usage, MCPE and DLLME align with the principles of green analytical chemistry. The incorporation of NADESs in MCPE facilitates energy-efficient extractions, while bio-based solvents in DLLME offer a sustainable alternative to traditional organic solvents. This study will provide a comprehensive evaluation of the advantages and limitations of each method, guiding the selection of the most effective green microextraction approach for specific analytical applications.

VEGA 1/0177/23 The development and implementation of innovative analytical procedures using an optical probe and alternative environmentally friendly solvents

The development and implementation of innovative microextraction techniques and processes compatible with liquid chromatography, UV-Vis and fluorescence spectrometry, in particular through the use of alternative solvents such as Switchable Hydrophilicity Solvents (SHS), Ionic Liquids (IL) and Deep Eutectic Solvents (DES). Automation of analytical measurements using an optical probe, including automation of selected extraction-free and microextraction procedures. Development and implementation of modified non-extraction and microextraction procedures and innovative methods for the determination of selected analytes (ammonia, sulphides, sulphites, thiosulphates, mercury, copper, cadmium, picric acid, anionic surfactants, estrogens, etc.) in environmental components, biological fluids , pharmaceuticals, new materials, etc. Verification of reliability of developed methods, validation and chemometric evaluation of obtained results and developed methods.