Effect of drying methods on chemical composition and antioxidant activity of underutilized stinging nettle leaves

Shonte, Tigist Tadesse; Duodu, Kwaku G.; Kock, Henrietta Letitia De

doi:10.1016/j.heliyon.2020.e03938

Cited by 60 publications

(81 citation statements)

References 53 publications

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“…In our study, the AAC in nettle leaves ranged from 8.17 mg 100 g −1 in April to 0.58 mg 100 g −1 in September ( Table 1 ). These values are lower when compared to the amounts of ascorbic acid reported by other investigators [ 5 , 20 , 21 , 22 ]. This could be influenced by meteorological conditions.…”

Section: Resultscontrasting

confidence: 68%

“…According to previous research [ 20 ], ascorbic acid in nettle leaves appears in two forms—ascorbic acid and dehydroascorbic acid. Scientists indicate that the total ascorbic acid content (AAC) may vary from 16.00 to 112.80 mg 100 g −1 of fresh weight (FW) or even to 238 mg 100 g −1 [ 5 , 20 , 21 , 22 ]. In our study, the AAC in nettle leaves ranged from 8.17 mg 100 g −1 in April to 0.58 mg 100 g −1 in September ( Table 1 ).…”

Section: Resultsmentioning

confidence: 99%

“…Plants use green pigment chlorophyll to trap light needed for photosynthesis. The accumulation of chemical compounds by the plant tissues is a function of its genotype, temperature, sunlight, and soil fertility status [ 22 ].…”

Section: Resultsmentioning

confidence: 99%

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Influence of Harvesting Time on the Chemical Composition of Wild Stinging Nettle (Urtica dioica L.)

Paulauskienė

Tarasevičienė

Laukagalis

2021

Plants

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This research aimed to determine the effect of different harvesting times on the chemical composition of stinging nettle (Urtica dioica L.). The leaves of nettle were harvested at the same place once a month in the period of April–September 2019. The analysis focused on the contents of dry matter, soluble solids, ascorbic acid, titratable acidity, chlorophyll a and chlorophyll b, total carotenoids, total phenolic compounds, antioxidant activity, ash content, and macro- and microelements. The nettles harvested in April were characterized by the highest levels of soluble solids and some macro-and microelements (P, K, Fe, Zn). The plants harvested in May were distinguished for titratable acidity, chlorophyll a, chlorophyll b, and carotenoid contents. In this month, the plants were determined to have the highest antioxidant activity during the entire vegetation period. The plants collected in July contained the highest amount of Mn, but the antioxidant activity of these plants was the lowest during the vegetation period. In August, the plants had the highest levels of ascorbic acid, phenolic compounds, and ash, while the plants collected in September were characterized by having the highest amounts of Ca, Mg, and B as compared to those established in other months of vegetation.

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Section: Resultscontrasting

confidence: 68%

Section: Resultsmentioning

confidence: 99%

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Influence of Harvesting Time on the Chemical Composition of Wild Stinging Nettle (Urtica dioica L.)

Paulauskienė

Tarasevičienė

Laukagalis

2021

Plants

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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: 70%

“…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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Optimization of Extraction Parameters and Characterization of Tunisian Date Extract: A Scientific Approach Toward Their Utilization

et al. 2022

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The response surface methodology (RSM) was used in order to select the extraction conditions of extract from Kentichi date powder; a by-product of the date-processing process. Powder/solvent ratio, extraction temperature, and extraction time all had an impact on sugar yield, and these model factors have quadratic effects influencing sugar yield. Optimal extraction was obtained with 300 g/L powder/solvent ratio, 32.7 °C extraction temperature, and 2.1 h extraction time. Under these conditions, Kentichi date powder's (KDP) sugar yield was 77.1%, which was close to the predicted value of the model (80.50%). The results of Kentichi date powder extract (KDPE) showed that the total sugar content is 160.09 g/L. However, the protein content is 10.31 g/L with a majority of the essential amino acids (essentially glutamic acid (28.39 mg/L) and aspartic acid (9.65 mg/L)). The determination of antioxidant activity of KDPE showed a high activity (DPPH IC 50 = 4.8 mg/mL, ABTS IC 50 = 3 mg/mL, FRAP = 4.70 μmol AAE/mL and, TAA = 18.04 μmol Fe(II)/mL). The results show also that the freeze-drying technique has a lot of potential for producing powder from KDPE with many desirable properties. The findings indicate that KDPE with a high nutritional value could be used as a component for the formulation of functional foods. Supplementary Information The online version contains supplementary material available at 10.1007/s12355-022-01223-2.

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Effect of drying methods on chemical composition and antioxidant activity of underutilized stinging nettle leaves

Cited by 60 publications

References 53 publications

Influence of Harvesting Time on the Chemical Composition of Wild Stinging Nettle (Urtica dioica L.)

Influence of Harvesting Time on the Chemical Composition of Wild Stinging Nettle (Urtica dioica L.)

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

Optimization of Extraction Parameters and Characterization of Tunisian Date Extract: A Scientific Approach Toward Their Utilization

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