Tomáš Valenta

Dr. Tomáš Valenta


Research Focus & Metrics

Academic Career Length

11Years (2016-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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26 May 2023 in Foods
Verified
Journal Article
Open access
PDF file
LLLubomir Lapcik
Lubomir Lapcik
DŘDavid Řepka
David Řepka
BLBarbora Lapčíková
Barbora Lapčíková
DSDaniela Sumczynski
Daniela Sumczynski
SGShweta Gautam
Shweta Gautam
TVTomáš Valenta
Tomáš Valenta
Corn silk (CS) extracts are reported to contain flavonoids (appx. 59.65 mg quercetin/g), polysaccharides (appx. 58.75 w.%), steroids (appx. 38.3 × 10−3 to 368.9 × 10−3 mg/mL), polyphenols (appx. 77.89 mg/GAE/g) and other functional biological substances. This study investigated the antioxidant activity of corn silk extracts related to their functional compounds. The radical scavenging effect of corn silk extracts was evaluated by the spin-trapping electron paramagnetic resonance (EPR) technique, 1,1-diphenyl-2-picrylhydrazyl (DPPH), 2,2′-azino-bis(3-ethylbenzo-thiazoline-6-sulfonate) (ABTS•+) free radical measurement, ferric ion-reducing antioxidant power, and copper ion reductive capacity. It was found that the maturity stage of CS plant materials and the applied extraction procedure of their bioactive compounds have a profound effect on the radical scavenging capacity. Differences in the antioxidant activity of the studied corn silk samples based on their maturity were also confirmed. The strongest DPPH radical scavenging effect was observed for the corn silk mature stage (CS-M)stage (CS-MS) (65.20 ± 0.90)%, followed by the silky stage (CS-S) (59.33 ± 0.61)% and the milky stage (CS-M) (59.20 ± 0.92)%, respectively. In general, the final maturity stage (CS-MS) provided the most potent antioxidant effect, followed by the earliest maturity stage (CS-S) and the second maturity stage (CS-M).

1 January 2022 in LWT
Verified
Journal Article
Open access
BLBarbora Lapčíková
Barbora Lapčíková
LLLubomir Lapcik
Lubomir Lapcik
Richardos Nikolaos SalekRichardos Nikolaos Salek
Richardos Nikolaos Salek
TVTomáš Valenta
Tomáš Valenta
ELEva Lorencová
Eva Lorencová
Martin VašinaMartin Vašina
Martin Vašina

12 December 2023 in Molecules
Verified
Journal Article
Open access
PDF file
MBMichaela Bartončíková
Michaela Bartončíková
BLBarbora Lapčíková
Barbora Lapčíková
LLLubomir Lapcik
Lubomir Lapcik
TVTomáš Valenta
Tomáš Valenta
Cannabis sativa L., a plant historically utilized for textile fibers, oil, and animal feed, is progressively being recognized as a potential food source. This review elucidates the nutritional and functional attributes of hemp and cannabidiol (CBD) within the context of food science. Hemp is characterized by the presence of approximately 545 secondary metabolites, among which around 144 are bioactive cannabinoids of primary importance. The study looks in detail at the nutritional components of cannabis and the potential health benefits of CBD, encompassing anti-inflammatory, anxiolytic, and antipsychotic effects. The review deals with the legislation and potential applications of hemp in the food industry and with the future directions of cannabis applications as well. The paper emphasizes the need for more scientific investigation to validate the safety and efficacy of hemp components in food products, as current research suggests that CBD may have great benefits for a wide range of consumers.

25 March 2023 in Foods
Verified
Journal Article
Open access
PDF file
KOKristýna Opustilová
Kristýna Opustilová
BLBarbora Lapčíková
Barbora Lapčíková
LLLubomir Lapcik
Lubomir Lapcik
SGShweta Gautam
Shweta Gautam
TVTomáš Valenta
Tomáš Valenta
PLPeng Li
Peng Li
Curcuma is a world-renowned herb known for its immense health benefits. In this study, physicochemical analyses were performed on the curcumin standard sample and curcumin multiple emulsions. The emulsions were analysed for thermal and structural stability for 21 days. Confocal laser microscopy (CLSM) was performed in order to observe the emulsion encapsulation. Modulated differential scanning calorimetry (MDSC) and HPLC methods revealed a variety of curcuminoids (curcumin, demethoxycurcumin, bisdemethoxycurcumin, and cyclocurcumin) in the investigated curcumin standard. In addition, the MDSC method was found to be suitable and comparable to HPLC for determining the curcuminoid substances. The analysis of the curcumin release revealed a value of 0.18 w.% after 14 days as the equilibrium value. Furthermore, an increase in the sizes of the emulsions was observed at the end of the 21-day study. The emulsion stability index (ESI) was used to measure the stability of multiple emulsions. The ESI reached 55.8% between 7 and 21 days later. Nano droplets of the oil phase loaded with dispersed curcumin particles captured inside the water-based carboxymethylcellulose micelles were clearly observed by CLSM.

22 April 2022 in Poultry Science
Verified
Journal Article
Open access
Robert GalRobert Gal
Robert Gal
JKJosef Kameník
Josef Kameník
Richardos Nikolaos SalekRichardos Nikolaos Salek
Richardos Nikolaos Salek
ZPZdeněk Polášek
Zdeněk Polášek
BMBlanka Macharáčková
Blanka Macharáčková
ŠVŠtěpán Vinter
Štěpán Vinter
The effect of various cooking methods (roasting, broiling, grilling, frying, and stewing) on cooking loss (CL) and textural and sensory properties of selected chicken (breast fillet, thigh, and thigh fillet) and turkey (breast fillet, thigh) cuts in relation to the applied apparatus was evaluated. Diverse results were recorded according to the method, the type of poultry meat, and the cut of poultry meat. Additionally, CL and shear force (SF) values in all examined samples were influenced by the culinary technique, the type of poultry meat, and the poultry meat cut. The lowest CL and shear SF values were reported when the samples were treated using a method with higher heating rates and/or temperatures and shorter cooking times. Additionally, lower values of CL and SF were obtained for chicken meat compared to turkey meat (thighs). In general, the applied culinary technique affected the sensory properties of the samples tested. High sensory scores were recorded for grilled chicken breast fillets and fried turkey breast fillets (irrespective of the applied apparatus). On the whole, it could be stated that culinary techniques at high temperature requiring shorter times (such as frying, grilling, and roasting) were evaluated to be more effective (in terms of CL and SF).

17 April 2024 in Foods
Verified
Journal Article
Open access
PDF file
BLBarbora Lapčíková
Barbora Lapčíková
LLLubomir Lapcik
Lubomir Lapcik
TVTomáš Valenta
Tomáš Valenta
MCMarie Chvatíková
Marie Chvatíková
In the context of growing interest in plant-based food products for their potential health benefits and sustainability, this study investigates the effect of mono- and diglycerides of fatty acids application on physico-chemical properties of various plant-based cream products, compared to lecithin application in rice cream. Rheological and textural parameters, colour profile, and colloidal stability were analysed. The application of mono- and diglycerides modified the creams’ viscoelastic behaviour, showing a decrease in viscoelasticity across the samples; although in oat–coconut cream resulted in a higher viscoelasticity, indicating the formation of a gel-like structure. Rice cream with lecithin emulsifier showed lower viscoelastic properties characterised by higher phase angle (tan δ). All samples behaved as pseudoplastic materials (with a flow behaviour index n < 1). For coconut and almond creams, the consistency coefficient increased and flow behaviour index decreased after emulsifier application. Interestingly, the emulsifier addition did not significantly affect the cream’s colour profile, characterised by yellow hue angle (h*) as a dominant spectral component. The colloidal stability, indicated by a stability index (SI), was determined as well.