Polyphenolic Acids of Female and Male Forms of Urtica Dioica

Roslon, W.; Węglarz, Z.

doi:10.17660/actahortic.2003.597.12

Cited by 6 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this study, the highest total polyphenol content in water extracts of nettle leaves and roots could be detected in April and May, hence the optimal harvest time for both plant parts is in the spring. This result is in accordance with findings published previously [29][30].…”

Section: Total Polyphenol Content Of Fresh Samplessupporting

confidence: 94%

“…Some researchers [20,39] reported that the habitat has a big influence on the accumulation of phenolic compounds in nettle leaves. As shown also in this study, total phenol content and antioxidant activity vary greatly among the different phenological stages of the plant [29][30][31]. The extraction solvent and the extraction conditions have a determining effect on the antioxidant properties of the extracts [35].…”

Section: Discussionmentioning

confidence: 73%

“…Biesiada et al [31] found that total polyphenol content of leaves decreases continuously from spring to autumn. However, Roslon and Weglarz [30] reported an increase in the total phenol content of nettle leaves up to the flowering, and then a decline in the phenolic concentration.…”

Section: Investigation Of Ethanolic Extracts During the Vegetation Pementioning

confidence: 97%

See 2 more Smart Citations

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.

View full text Add to dashboard Cite

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.

show abstract

Section: Total Polyphenol Content Of Fresh Samplessupporting

confidence: 94%

Section: Discussionmentioning

confidence: 73%

See 1 more Smart Citation

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.

View full text Add to dashboard Cite

show abstract

“…Authors reported that the total polyphenols decrease is due to the decrease of non-tannin phenols (phenolcarboxylic acids and flavonoids), which are the most important compounds from nettle leaves. This was also confirmed by Roslon et al (2003) [ 45 ] who reported a sudden drop of phenolcarboxylic acids in leaves harvested at the plant flowering stage. Furthermore, the results of Biesiada et al (2009, 2010) [ 46 , 47 ] and Kőszegi et al (2020) [ 19 ] also indicated that the beginning of the nettle vegetation period was optimal for harvesting, giving the highest yield of polyphenols, which then decreased by autumn for over 50%.…”

Section: Resultssupporting

confidence: 79%

Bioactive Compounds in Wild Nettle (Urtica dioica L.) Leaves and Stalks: Polyphenols and Pigments upon Seasonal and Habitat Variations

Repajić

Cegledi

Zorić

et al. 2021

Foods

View full text Add to dashboard Cite

This study evaluated the presence of bioactives in wild nettle leaves and stalks during the phenological stage and in the context of natural habitat diversity. Thus, wild nettle samples collected before flowering, during flowering and after flowering from 14 habitats situated in three different regions (continental, mountain and seaside) were analyzed for low molecular weight polyphenols, carotenoids and chlorophylls using UPLC-MS/MS and HPLC analysis, while the ORAC method was performed for the antioxidant capacity measurement. Statistical analysis showed that, when compared to the stalks, nettle leaves contained significantly higher amounts of analyzed compounds which accumulated in the highest yields before flowering (polyphenols) and at the flowering stage (pigments). Moreover, nettle habitat variations greatly influenced the amounts of analyzed bioactives, where samples from the continental area contained higher levels of polyphenols, while seaside region samples were more abundant with pigments. The levels of ORAC followed the same pattern, being higher in leaves samples collected before and during flowering from the continental habitats. Hence, in order to provide the product’s maximum value for consumers’ benefit, a multidisciplinary approach is important for the selection of a plant part as well as its phenological stage with the highest accumulation of bioactive compounds.

show abstract

“…Weglarz and Roslon studied the content of polyphenolic acids in leaves and rhizomes. They found that the level of these compounds was higher in the male forms, but the chemical profiles of polyphenolic acids from the female plants were much more diverse [ 40 , 41 ]. Moreover U. dioica is considered the only plant that contains choline acetyl-transferase, an acetylcholine-synthesizing enzyme [ 42 ].…”

Section: Phytochemical Composition Of Urtica Spmentioning

confidence: 99%

Urtica spp.: Ordinary Plants with Extraordinary Properties

2018

View full text Add to dashboard Cite

Nettles (genus Urtica, family Urticaceae) are of considerable interest as preservatives in foods for both human and animal consumption. They have also been used for centuries in traditional medicine. This paper reviews the properties of nettles that make them suitable for wider applications in the food and pharmaceutical industries. Nettles contain a significant number of biologically-active compounds. For example, the leaves are rich sources of terpenoids, carotenoids and fatty acids, as well as of various essential amino acids, chlorophyll, vitamins, tannins, carbohydrates, sterols, polysaccharides, isolectins and minerals. Extracts from the aerial parts of nettles are rich sources of polyphenols, while the roots contain oleanol acid, sterols and steryl glycosides. Due to the variety of phytochemicals and their proportions they contain, nettles show noticeable activity against both Gram-positive and Gram-negative bacteria. These properties make nettles suitable for a range of possible applications, including functional food, dietary supplements and pharmacological formulations. Despite these benefits, the nettle is still an underestimated plant source. This paper provides a unique overview of the latest research on nettle plants focusing on the possibilities for transforming a common weed into a commercial plant with a wide range of applications. Special attention is paid to the antimicrobial activity of the active compounds in nettles and to possible uses of these valuable plants in food and feed formulations.

show abstract

Polyphenolic Acids of Female and Male Forms of Urtica Dioica

Cited by 6 publications

References 0 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

Bioactive Compounds in Wild Nettle (Urtica dioica L.) Leaves and Stalks: Polyphenols and Pigments upon Seasonal and Habitat Variations

Urtica spp.: Ordinary Plants with Extraordinary Properties

Contact Info

Product

Resources

About