Publications by authors named "Jana Nadvornikova"

Wall paintings are integral to cultural heritage and offer rich insights into historical and religious beliefs. There exist various wall painting techniques that pose challenges in binder and pigment identification, especially in the case of egg/oil-based binders. GC-MS identification of lipidic binders relies routinely on parameters like the ratios of fatty acids within the plaster.

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Article Synopsis
  • An archaeological dig in Prostějov, Czech Republic, uncovered a potter's workshop containing various color powders likely used for faience and surface decoration.
  • A detailed analysis using advanced techniques like SEM EDX, ICP MS, and Raman spectroscopy was conducted to investigate the chemical makeup of these powders.
  • Results indicated that the pink powder contained iron and the blue powder contained Prussian blue, along with organic materials such as plant resin, beeswax, and fats, suggesting these mixtures were used similarly to oil paints.
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Determination of cholesterol in food matrices is essential for quality control concerning the health of consumers. Herein, a simple electrochemical approach for cholesterol quantitation in dairy products is evaluated. The newly developed differential pulse voltammetric method using acetonitrile-perchloric acid mixture as a supporting electrolyte is statistically compared to GC-MS and HPLC-UV.

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Electronically driven micromanipulation (EDM) with microscopic control was used as a novel tool for sample preparation prior to direct (matrix assisted) laser desorption/ionization mass spectrometric ((MA)LDI-MS) analysis of mature pea seed coat composition in defined layers. Microscissors were used for seed coat fragment shape adjustment, microtweezers for sample holding and "microjackhammer" Milling Pro for precise mechanical removing of cell layers in defined depths (2, 5 or 10 μm). These procedures circumvent the application of embedding media or enzymatic digestion of seed coat that would complicate mass spectra interpretation (presence of matrix signals, analyte signals enhancement or attenuation) and represent alternative for 3D metabolites profiling.

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