Antioxidant Activity in Nettle (Urtica Dioica L.) and Garden Orache (Atriplex Hortensis L.) Leaves During Vegetation Period

Zeipiņa, Solvita; Alsiņa, I.; Lepse, L.; Dūma, Māra

doi:10.5755/j01.ct.66.1.12055

Cited by 8 publications

(11 citation statements)

References 10 publications

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“…The higher etanolic concentration caused higher antioxidant activities in the leaf extracts, FRAP values were the highest in April and May, then the antioxidant capacity decreased in the summer, and showed the minimum level in October. The same trend was obtained by some authors [31,32]. Table 1 summarizes the data measured for both dried leaves and roots collected at the beginning and at the end of vegetation.…”

Section: Antioxidant Capacity Of Fresh Samplessupporting

confidence: 83%

Changes in Total Polyphenol Content and Antioxidant Capacity of Stinging Nettle (Urtica dioica L.) from Spring to Autumn

Kőszegi

Békássy-Molnár

Koczka

et al. 2019

Period. Polytech. Chem. Eng.

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Total polyphenol content and antioxidant/reducing capacity of stinging nettle (Urtica dioica L.) leaves and roots collected from wild-grown plants were investigated during the vegetation period. From both fresh and dried samples of leaves and roots, water extracts were prepared by brewing at 60, 80 and 100 °C for 3 hours, and ethanolic extracts of 20 % (v/v) and 70 % (v/v) by extracting at room temperature for 72 hours. The total polyphenol content was determined spectrophotometrically with Folin-Cioceltau reagent and the antioxidant capacity was measured by ferric reducing ability of plasma (FRAP) assay. Our results showed that the optimal harvest time is in the spring (April). Water extracts had the highest total polyphenol content and antioxidant capacity in this period. The amount of valuable compounds released increased by higher extraction temperature in both plant parts. In water extracts of nettle leaves, two times higher polyphenol content was obtained than in that of roots. Both kind of ethanolic extractions resulted in a higher polyphenol content in the leaves harvested in the spring period. For the roots, it was higher for samples collected in the autumn, which is also reflected in the values of antioxidant capacity. Water extracts of fresh leaves harvested in April had more than twice higher total polyphenol content than in October. For dried samples, raising the temperature did not cause a significant change in the total polyphenol content, however, it has resulted in increased antioxidant capacity both for the dried leaf and root samples.

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Section: Antioxidant Capacity Of Fresh Samplessupporting

confidence: 83%

Changes in Total Polyphenol Content and Antioxidant Capacity of Stinging Nettle (Urtica dioica L.) from Spring to Autumn

Kőszegi

Békássy-Molnár

Koczka

et al. 2019

Period. Polytech. Chem. Eng.

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“…Flavonoids, phenolic acids and other polyphenols as antioxidants can react with the free radicals of macromolecules, preventing undesirable aging processes. The high antioxidant activity of the leaves was confirmed in many of the previously described studies [ 64 , 65 ]. In addition, all the additives used can act as UV radiation absorbers, which was confirmed by UV-Vis spectroscopy analysis.…”

Section: Resultssupporting

confidence: 71%

“…On the basis of the obtained colorimetric results, it can also be observed that UV radiation caused a greater color change than the increased temperature. This is due to the presence of natural stabilizers and antioxidants in common nettle, such as carotenoids and flavonoids, that are less UV resistant [ 38 , 64 , 65 ].…”

Section: Resultsmentioning

confidence: 99%

Common Nettle (Urtica dioica L.) as an Active Filler of Natural Rubber Biocomposites

2021

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Common nettle (Urtíca Dióica L.), as a natural fibrous filler, may be part of the global trend of producing biocomposites with the addition of substances of plant origin. The aim of the work was to investigate and explain the effectiveness of common nettle as a source of active functional compounds for the modification of elastomer composites based on natural rubber. The conducted studies constitute a scientific novelty in the field of polymer technology, as there is no research on the physico-chemical characteristics of nettle bio-components and vulcanizates filled with them. Separation and mechanical modification of seeds, leaves, branches and roots of dried nettle were carried out. Characterization of the ground plant particles was performed using goniometric measurements (contact angle), Fourier transmission infrared spectroscopy (FTIR), themogravimetric analysis (TGA) and scanning electron microscopy (SEM). The obtained natural rubber composites with different bio-filler content were also tested in terms of rheological, static and dynamic mechanical properties, cross-linking density, color change and resistance to simulated aging processes. Composites with the addition of a filler obtained from nettle roots and stems showed the highest mechanical strength. For the sample containing leaves and branches, an increase in resistance to simulated ultraviolet and thermo-oxidative aging processes was observed. This phenomenon can be attributed to the activity of ingredients with high antioxidant potential contained in the plant.

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“…According to the literature, antiradical properties and inhibitory potential of nettle are greater than those of many synthetic antioxidants (Zeipina et al., 2015). Antioxidant activity of nettle leaves was reported to range from 17.31% to 80.77%.…”

Section: Resultsmentioning

confidence: 99%

Optimization of fortified sponge cake by nettle leaves and milk thistle seed powder using mixture design approach

Nukabadi

Hojjatoleslamy

Abbasi

2020

Food Science & Nutrition

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Powdered nettle leaf and milk thistle (MT) seed were added to the cake batter with certain percentages selected by the Design‐Expert v. 10 software (0–25, 25–0, 18.75–6.25, 6.25–18.75, and 12.5–12.5). Addition of nettle and MT seeds to the cake reduced the moisture content, volume, and springiness and increased hardness of the samples. 12.5% nettle‐12.5% MT seed had the least hardness and the highest amount of springiness and cohesiveness. The highest BI, WI, SI, L*, a*, and b* and the lowest ΔE were observed in 12.5% nettle‐12.5% MT seed and 25% MT seed samples, respectively. Antioxidant activity and antimicrobial properties were increased in all samples compared to the control sample, so that 6.25% nettle‐18.75% MT exhibited the highest antioxidant activity and antimicrobial properties. The highest levels of quercetin and silymarin were observed in 25% nettle and 25% MT seeds, respectively. In the sensory evaluation, 12.5% nettle‐12.5% MT seed took the best scores regarding flavor, texture, color, and overall acceptance. Based on the lowest hardness, 13.65% nettle‐11.34% MT seed was determined as optimized points by the software, which was equivalent to desirability of 0.72. The optimum sample contained 62.90 mg quercetin and 886.70 mg silymarin. According to the HPLC analysis results, consumption of 10 optimal cakes daily could theoretically decrease the blood sugar level, which requires further studies. The remaining amount of quercetin and silymarin in 2.5 g of nettle leaves and 2.5 g of MT seeds after heating was 11 and 19 mg, respectively. In other words, heat did not have much effect on the destruction of quercetin and silymarin.

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Antioxidant Activity in Nettle (Urtica Dioica L.) and Garden Orache (Atriplex Hortensis L.) Leaves During Vegetation Period

Cited by 8 publications

References 10 publications

Changes in Total Polyphenol Content and Antioxidant Capacity of Stinging Nettle (Urtica dioica L.) from Spring to Autumn

Changes in Total Polyphenol Content and Antioxidant Capacity of Stinging Nettle (Urtica dioica L.) from Spring to Autumn

Common Nettle (Urtica dioica L.) as an Active Filler of Natural Rubber Biocomposites

Optimization of fortified sponge cake by nettle leaves and milk thistle seed powder using mixture design approach

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