Browsing by Author "Oniszczuk, Tomasz"

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    In Vitro Digestion of Polyphenolic Compounds and the Antioxidant Activity of Acorn Flour and Pasta Enriched with Acorn Flour
    (MDPI, 2024) Kasprzak-Drozd, Kamila ; Mołdoch, Jarosław; Gancarz, Marek; Wójtowicz, Agnieszka; Kowalska, Iwona; Oniszczuk, Tomasz; Oniszczuk, Anna
    Acorn flour is a rich source of nutrients and is beneficial to human health due to, among other things, its low glycemic index and polyphenol content. In order to obtain more accurate data on the levels and activities of the substances tested after ingestion and digestion, it may be beneficial to use a simulated in vitro digestion method. Therefore, the objective of the present study was to elucidate the content of polyphenols, individual phenolic acids, flavonoids and antiradical properties of acorn flour and pasta enriched with acorn flour before and after simulated in vitro gastrointestinal digestion. The results indicate that the total polyphenol content (TPC), flavonoid content and radical scavenging activity exhibited an increasing trend following the initial digestion stage and a decreasing trend following the second stage. Nevertheless, the levels of phenolic acids demonstrated an increase in both digestion phases. The digestion processes of polyphenols in acorn flour differ significantly from those in pasta. In the case of pasta, total polyphenols , phenolic acids and flavonoids, as well as free radical scavenging properties, demonstrated a decreasing trend following each digestion stage.
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    The Impact of Fresh Blueberry Addition on the Extrusion-Cooking Process, Physical Properties and Antioxidant Potential of Potato-Based Snack Pellets
    (MDPI, 2025-05) Combrzyński, Maciej; Soja, Jakub; Oniszczuk, Tomasz; Wojtunik-Kulesza, Karolina; Kręcisz, Magdalena; Mołdoch, Jarosław; Biernacka, Beata
    The aim of the study was to develop a new generation of potato-based snack granules enriched with fresh blueberries and evaluate the extrusion-cooking process along with selected physical properties. Blueberries were added in varying amounts (10%, 20%, and 30%) as an ingredient for the semi-finished product. The analysis focused on the impact of moisture content, screw speed, and blueberry concentration on extrusion efficiency and product properties. The results showed significant effects of blueberry addition on extrusion-cooking efficiency (14.40 to 37.12 kg/h) and energy consumption (0.003 to 0.021 kWh/kg). Durability, bulk density, water absorption index (WAI) and water solubility index (WSI) were evaluated with values ranging from 95.46 to 97.61%, 345.07 to 547.37 kg/m3, 2.90 to 3.88 g/g and 8.23 to 18.52%. The incorporation of blueberries also eliminated the need for drying, reducing water consumption and energy demand. Additionally, the antioxidant potential of the blueberry-enriched samples was assessed, indicating improved health benefits (DPPH from 22.71 to 94.22%). Based on the results, the incorporation of up to 30% blueberries is recommended for optimal physical properties and enhanced antioxidant activity.