Ivan Špánik
YOU?
Author Swipe
View article: Untargeted Chemical Profiling of Two-Dimensional Gas Chromatography Coupled with High-Resolution Mass Spectrometry Data for Botrytized Wines via Topological Data Analysis
Untargeted Chemical Profiling of Two-Dimensional Gas Chromatography Coupled with High-Resolution Mass Spectrometry Data for Botrytized Wines via Topological Data Analysis Open
Advanced chemical profiling of complex samples, such as botrytized wines, requires advanced analytical techniques capable of capturing subtle compositional variations. In this study, we introduce a statistically robust framework that lever…
View article: The profiling of phenolic compounds in archive Tokaj wines using liquid chromatography and antioxidant activity analysis
The profiling of phenolic compounds in archive Tokaj wines using liquid chromatography and antioxidant activity analysis Open
Archive Tokaj wines from the vineyards in the Slovak part of the Tokaj region have been characterized in terms of the content of phenolic compounds specific to that type of botrytized wine. More than 60 archive samples (1959-2017) were eva…
View article: Legacy and emerging organic pollutants in indoor and outdoor environments in Africa: Contamination levels, health risks, and analytical techniques
Legacy and emerging organic pollutants in indoor and outdoor environments in Africa: Contamination levels, health risks, and analytical techniques Open
The World Health Organisation reported that over 20 % of the global disease burden and deaths are caused by environmental factors such as air and dust pollution. Legacy organic pollutants (LOPs) and emerging organic pollutants (EOPs) are a…
View article: Artificial intelligence decision making tools in food metabolomics: Data fusion unravels synergies within the hazelnut (Corylus avellana L.) metabolome and improves quality prediction
Artificial intelligence decision making tools in food metabolomics: Data fusion unravels synergies within the hazelnut (Corylus avellana L.) metabolome and improves quality prediction Open
This study investigates the metabolome of high-quality hazelnuts (Corylus avellana L.) by applying untargeted and targeted metabolome profiling techniques to predict industrial quality. Utilizing comprehensive two-dimensional gas chromatog…
View article: Validation of an Isocratic HPLC Method for Simultaneous Estimation of Major Phytosterols in Prunus spinosa L. Extracts
Validation of an Isocratic HPLC Method for Simultaneous Estimation of Major Phytosterols in Prunus spinosa L. Extracts Open
This study aimed to develop a rapid method for the separation of stigmasterol, campesterol and β-sitosterol in Prunus spinosa L. (blackthorn) fruit extracts by HPLC system. Samples were prepared by Soxhlet extraction method and separated o…
View article: Region of interest selection in heterogeneous digital image: Wine age prediction by comprehensive two-dimensional gas chromatography
Region of interest selection in heterogeneous digital image: Wine age prediction by comprehensive two-dimensional gas chromatography Open
This study integrates genetic algorithm (GA) with partial least squares regression (PLSR) and various variable selection methods to identify impactful regions of interest (ROI) in heterogeneous 2D chromatogram images for predicting wine ag…
View article: Investigative Approaches for Pollutants in Water: Aligning with Water Framework Directive Maximum Allowable Concentrations
Investigative Approaches for Pollutants in Water: Aligning with Water Framework Directive Maximum Allowable Concentrations Open
In the wake of rapid advancements in the pharmaceutical, food, and agricultural industries, the environment faces an increasing influx of diverse compounds, both intentionally and unintentionally released. These compounds fall into two cat…
View article: A non‐target geographical origin screening of botrytized wines through comprehensive two‐dimensional gas chromatography coupled with high‐resolution mass spectrometry
A non‐target geographical origin screening of botrytized wines through comprehensive two‐dimensional gas chromatography coupled with high‐resolution mass spectrometry Open
One of the most effective methods for gaining insight into the composition of trace‐level volatile organic characteristics of wine products is through the use of a comprehensive two‐dimensional gas chromatography‐high resolution mass spect…
View article: Aroma Compounds in Essential Oils: Analyzing Chemical Composition Using Two-Dimensional Gas Chromatography–High Resolution Time-of-Flight Mass Spectrometry Combined with Chemometrics
Aroma Compounds in Essential Oils: Analyzing Chemical Composition Using Two-Dimensional Gas Chromatography–High Resolution Time-of-Flight Mass Spectrometry Combined with Chemometrics Open
Analyzing essential oils is a challenging task for chemists because their composition can vary depending on various factors. The separation potential of volatile compounds using enantioselective two-dimensional gas chromatography coupled w…
View article: Groundwater quality assessment of protected aquatic eco-systems in cross-border areas of Serbia and Croatia
Groundwater quality assessment of protected aquatic eco-systems in cross-border areas of Serbia and Croatia Open
Research results define basis for specific monitoring programs of groundwater quality in wetland eco-systems in Serbia and Croatia. The main purpose of the research was to determine the impact of nonpoint diffuse source pollution on the gr…
View article: Screening analysis of pesticides in the protected area of Zobnatica Lake
Screening analysis of pesticides in the protected area of Zobnatica Lake Open
The aim of study was to characterize pollution of water in protected area of Zobnatica Lake in the vicinity of Backa Topola, Serbia. The sampling campaigns were conducted in spring and summer 2019 in order to identify organic pollutants in…
View article: Classification of Botrytized Wines Based on Producing Technology Using Flow-Modulated Comprehensive Two-Dimensional Gas Chromatography
Classification of Botrytized Wines Based on Producing Technology Using Flow-Modulated Comprehensive Two-Dimensional Gas Chromatography Open
The enantiomeric ratio of chiral compounds is known as a useful tool to estimate wine quality as well as observe an influence of wine-producing technology. The incorporation of flow-modulated comprehensive two-dimensional gas chromatograph…
View article: Determination of Ochratoxin A and Ochratoxin B in Archived Tokaj Wines (Vintage 1959–2017) Using On-Line Solid Phase Extraction Coupled to Liquid Chromatography
Determination of Ochratoxin A and Ochratoxin B in Archived Tokaj Wines (Vintage 1959–2017) Using On-Line Solid Phase Extraction Coupled to Liquid Chromatography Open
According to the EU legislation, ochratoxin A contamination is controlled in wines. Tokaj wine is a special type of sweet wine produced from botrytized grapes infected by “noble rot” Botrytis cinerea. Although a high contamination was repo…
View article: Production and characterisation of non-alcoholic beer using special yeast
Production and characterisation of non-alcoholic beer using special yeast Open
Non-Saccharomyces yeast strains Saccharomycodes ludwigii, Schizosaccharomyces pombe, Lachancea fermentati and Pichia angusta together with a hybrid yeast strain cross-bred between genetically modified Saccharomyces cerevisiae W303-1A G418R…
View article: Impact of different pure cultures of Saccharomyces cerevisiae on the volatile profile of Cabernet Sauvignonrosé wines
Impact of different pure cultures of Saccharomyces cerevisiae on the volatile profile of Cabernet Sauvignonrosé wines Open
Grape juice of Cabernet Sauvignon was fermented with three axenic cultures of Saccharomyces cerevisiae (CS-V1, CS-V2, CS-V3) to determine the effect of yeast strain on the aroma of rosé wine. An analytical methodology based on headspace so…
View article: Determination of biological markers of organic substances in sediment and soil samples by gas chromatography
Determination of biological markers of organic substances in sediment and soil samples by gas chromatography Open
Once they reach the environment, petroleum hydrocarbons undergo various chemical, physico-chemical and biochemical transformation processes. Organic compounds which are not or are very poorly subject to these processes are thermodynamicall…
View article: Comparison of Different Categories of Slovak Tokaj Wines in Terms of Profiles of Volatile Organic Compounds
Comparison of Different Categories of Slovak Tokaj Wines in Terms of Profiles of Volatile Organic Compounds Open
The present work deals with the characterization of volatile organic compounds (VOCs) in wines from the Slovak Tokaj wine region. Studied wine samples were divided into three groups—varietal wines from registered Tokaj vine varieties, film…
View article: Scalable Preparation of Enantioenriched (S)-5-methylhept-2-en-4-one. Synthesis and Aroma Properties of Achiral Analogues Thereof
Scalable Preparation of Enantioenriched (S)-5-methylhept-2-en-4-one. Synthesis and Aroma Properties of Achiral Analogues Thereof Open
(S)-5-Methylhept-2-en-4-one is a key flavour compound in hazelnuts. We have performed its chiral-pool-based chemoenzymatic synthesis with 39% overall yield (73% ee). The four-step aldol-based sequence avoids the use of highly reactive and/…
View article: Risk Assessment Approach for Prioritizing DanubeBasin-Specific Pollutants: a Case Studyin the Novi Sad Region
Risk Assessment Approach for Prioritizing DanubeBasin-Specific Pollutants: a Case Studyin the Novi Sad Region Open
The aim of this work was to determine the most relevant pollutants in Danube surface water and wastewater in the city of Novi Sad, and to conduct a risk assessment approach on substances for the optimization of future monitoring programmes…
View article: Photo-Reduction of CO2 by VIS Light on Polythiophene-ZSM-5 Zeolite Hybrid Photo-Catalyst
Photo-Reduction of CO2 by VIS Light on Polythiophene-ZSM-5 Zeolite Hybrid Photo-Catalyst Open
A new hybrid photo-catalyst based on ZSM-5 zeolite suitable for reduction of carbon dioxide was synthesized. The photo-catalyst was prepared by oxidative polymerization of thiophene with FeCl3 in the presence of ZSM-5 with participation of…
View article: Effect of indigenous S. cerevisiae strains on higher alcohols, volatile acids and esters in wine
Effect of indigenous S. cerevisiae strains on higher alcohols, volatile acids and esters in wine Open
Higher alcohols, volatile fatty acids, and esters are the most important volatiles and their formation is closely related to yeast strains employed during fermentation. In the present work, the effect of indigenous yeast strains on selecte…