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Effect of Spray Drying Encapsulation on Nettle Leaf Extract Powder Properties, Polyphenols and Their Bioavailability

Cegledi, Ena; Garofulić, Ivona Elez; Zorić, Zoran; Roje, Marin; Dragović-Uzelac, Verica (2022) Effect of Spray Drying Encapsulation on Nettle Leaf Extract Powder Properties, Polyphenols and Their Bioavailability. Foods, 11 (18). ISSN 2304-8158

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Nettle (Urtica dioica L.) is a plant rich in a health-promoting compounds such as polyphenols, which are sensitive and unstable compounds with low bioavailability, that need to be stabilized and protected from external influences. Therefore, the aim of this study was to examine how the temperature, type of carrier and sample to carrier ratio influence the physicochemical properties and encapsulation and loading capacity of the nettle leaf extract powder and examine the effect of encapsulation on the antioxidant capacity and bioavailability of polyphenols. The process yield ranged from 64.63–87.23%, moisture content from 1.4–7.29%, solubility from 94.76–98.53% and hygroscopicity from 13.35–32.92 g 100 g−1. The highest encapsulation (98.67%) and loading (20.28%) capacities were achieved at 160 ◦C, β- CD:GA (3:1) and sample:carrier ratio of 1:3. Extracts encapsulated at selected conditions showed high antioxidant capacity and distinct polyphenolic profile comprised of 40 different compounds among which cinnamic acids were the most abundant. Moreover, the encapsulation increased the bioavailability of nettle leaf polyphenols, with the highest amount released in the intestinal phase. Thus, the obtained encapsulated extract represents a valuable source of polyphenols and may therefore be an excellent material for application in value-added and health-promoting products.

Item Type: Article
Uncontrolled Keywords: spray drying ; nettle leaves ; maltodextrin ; gum arabic ; β-cyclodextrin ; antioxidant capacity
Subjects: BIOTECHNICAL SCIENCES > Food Technology
Divisions: Division of Organic Chemistry and Biochemistry
Project titleProject leaderProject codeProject type
Izolacija i enkapsulacija bioaktivnih molekula samonikle i kultivirane koprive i komorača i učinci na fiziologiju organizmaDragović-Uzelac, VericaIP-2018-01-4924HRZZ
Depositing User: Marin Roje
Date Deposited: 04 Oct 2022 12:38
DOI: 10.3390/foods11182852

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