Jitka Klikarová's research while affiliated with University of Pardubice and other places

... Therefore, it is essential that analytical techniques are able to detect various forms of adulteration (the use of poor-quality coffee beans, such as unripe, burnt, defective, etc. [10], presence of specific adulterants (Figure 2), degree of dilution, and unauthorized use of geographic origin of coffee beans [112,115,116]) to find whether the product label claims are based on the truth. For these reasons, various spectroscopic [12,63,64,[67][68][69][70][71]75,[80][81][82][106][107][108]113,[117][118][119][120], electrophoretic [87,109], electrochemical [110,114], and biological [102,109,111,121] techniques have already been developed, but chromatographic techniques, especially high performance liquid chromatography (HPLC), have become the most dominant [1,47,61,72,73,85,86,88,90,94,[122][123][124] for their more versatile use, reliability, reproducibility of results, possibility of automatization, identification of a large number of qualitative biomarkers in complex matrices, and low sample consumption [13,21,61,123,125]. coffee husks and stalks, cereals (e.g., chicory, corn, barley, wheat, rye, oats, rice, buckwheat, triticale, bran, and malt), legumes (e.g., soybeans, peas, chickpeas, and carob), roots (e.g., chicory or dandelion), vegetables (e.g., potatoes, carrots, and beetroots), fruits (e.g., figs, bananas, acai, and prunes), nuts (e.g., almonds, peanuts, and chestnuts), and seeds (especially cocoa and sunflower seeds). ...

... The method for analysing bamboo beverage free amino acids was adapted from Klikarova et al. (2021) with slight modifications. Five millilitres (5 mL) of fresh bamboo juice was mixed with 5 mL of extracting solvent (75% methanol in distilled water) and shaken for 2 min. ...

... Moreover, the present factor leads to considerable differentiation of phenolic and volatile compounds in EVOO [21]. This is proved in many previous studies mostly for the phenolic fraction [14,33,50,56]; in addition, according to Kiralan et al. [57], the volatile fraction (particularly (E)-2-hexenal) varied between oils from different provenance: significant dissimilarity was observed for monovarietal oils and different geographic regions (Hatay and Antalya that showed for instance a high variation in hexanal amount (29% and 14%, respectively), and explained by climatic conditions and location (latitude, longitude). ...

... Although there are many precedents demonstrating the usefulness of NMR techniques [13], qNMR is not routinely used to quantify sugars. From a practical point of view, quantitative phytochemical analysis in quality assurance is always limited by resources, including sample material, access to instrumentation, and investigation time. ...

... Taurine not present an oxidation peak in the assays performed. In fact, taurine does not exhibit a significant electroactivity and derivatization steps are necessary to produce an electrochemically active species to enable electroanalysis to be performed [52]. These results indicate that the proposed N,S-GQD-CS/GCE had good selectivity toward VB 2 , VB 6 and VB 12 in energy drink samples containing B-group vitamins. ...