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10 Results Found

  • Article
  • Open Access
9 Citations
5,983 Views
20 Pages

Optimization of a Pre-MEKC Separation SPE Procedure for Steroid Molecules in Human Urine Samples

  • Ilona Olędzka,
  • Piotr Kowalski,
  • Szymon Dziomba,
  • Piotr Szmudanowski and
  • Tomasz Bączek

13 November 2013

Many steroid hormones can be considered as potential biomarkers and their determination in body fluids can create opportunities for the rapid diagnosis of many diseases and disorders of the human body. Most existing methods for the determination of s...

  • Feature Paper
  • Review
  • Open Access
15 Citations
3,190 Views
24 Pages

12 September 2021

Bile salts are naturally occurring chiral surfactants that are able to solubilize hydrophobic compounds. Because of this ability, bile salts were exploited as chiral selectors added to the background solution (BGS) in the chiral micellar electrokinet...

  • Article
  • Open Access
1 Citations
1,083 Views
13 Pages

The unregulated consumption of corticosteroids causes significant adverse effects on human health. Therefore, it is important to develop methodologies that allow their analysis in pharmaceutical matrices with competitive analysis times and costs. The...

  • Article
  • Open Access
5 Citations
2,991 Views
12 Pages

28 September 2021

The online preconcentration technique, cyclodextrin-assisted sweeping (CD-sweeping), coupled with micellar electrokinetic chromatography (MEKC) was established to determine 13-cis-retinoic acid (13-cis-RA), all-trans-retinoic acid (all-trans-RA) and...

  • Article
  • Open Access
10 Citations
3,289 Views
22 Pages

7 August 2024

The relationship between fossil fuel CO2 emissions and economic growth in the Visegrád (V4) countries (Czechia, Hungary, Poland, and Slovakia) is examined through the lens of the environmental Kuznets curve (EKC) hypothesis. Employing the modi...

  • Article
  • Open Access
1,360 Views
15 Pages

Signal Enhancement of Selected Norepinephrine Metabolites Extracted from Artificial Urine Samples by Capillary Electrophoretic Separation

  • Piotr Kowalski,
  • Natalia Hermann,
  • Dagmara Kroll,
  • Mariusz Belka,
  • Tomasz Bączek and
  • Ilona Olędzka

14 November 2024

The measurement of selected norepinephrine metabolites, such as 3,4-dihydroxyphenylglycol (DHPG), 3-methoxy-4-hydroxyphenylethylenglycol (MHPG), and vanillylmandelic acid (VMA), in biological matrices—including urine—is of great clinical...

  • Review
  • Open Access
18 Citations
5,143 Views
51 Pages

27 June 2022

It is now more than 25 years since the first report of enantioselective analysis by capillary electrophoresis-mass spectrometry (CE-MS) appeared. This article reviews the power of chiral CE-MS in resolving issues on the use of chiral selector incompa...

  • Article
  • Open Access
4 Citations
2,329 Views
16 Pages

28 July 2023

This study focuses on determining the partition coefficients (logP) of a diverse set of 63 molecules in three distinct micellar systems: hexadecyltrimethylammonium bromide (HTAB), sodium cholate (SC), and lithium perfluorooctanesulfonate (LPFOS). The...

  • Article
  • Open Access
2 Citations
955 Views
15 Pages

Several strategies, including UV detection with a diode array detector (DAD), laser-induced fluorescence (LIF), derivatization reactions, the use of micelles in the separation buffer, as well as online preconcentration techniques based on pressure-as...

  • Article
  • Open Access
18 Citations
6,241 Views
22 Pages

Lipophilicity Determination of Antifungal Isoxazolo[3,4-b]pyridin-3(1H)-ones and Their N1-Substituted Derivatives with Chromatographic and Computational Methods

  • Krzesimir Ciura,
  • Joanna Fedorowicz,
  • Filip Andrić,
  • Petar Žuvela,
  • Katarzyna Ewa Greber,
  • Paweł Baranowski,
  • Piotr Kawczak,
  • Joanna Nowakowska,
  • Tomasz Bączek and
  • Jarosław Sączewski

26 November 2019

The lipophilicity of a molecule is a well-recognized as a crucial physicochemical factor that conditions the biological activity of a drug candidate. This study was aimed to evaluate the lipophilicity of isoxazolo[3,4-b]pyridine-3(1H)-ones and their...