Neugart, Susanne

[["dc.bibliographiccitation.firstpage","2710"],["dc.bibliographiccitation.issue","20"],["dc.bibliographiccitation.journal","Plants"],["dc.bibliographiccitation.volume","11"],["dc.contributor.author","Engelhardt, Layla"],["dc.contributor.author","Pöhnl, Tobias"],["dc.contributor.author","Neugart, Susanne"],["dc.date.accessioned","2022-12-01T08:31:45Z"],["dc.date.available","2022-12-01T08:31:45Z"],["dc.date.issued","2022"],["dc.date.updated","2022-11-11T13:12:05Z"],["dc.description.abstract","Urtica dioica L. and Aegopodium podagraria L., also known as stinging nettle and ground elder, are edible wild green vegetables rich in bioactive and antioxidant polyphenols, vitamins, and minerals. Antioxidant activity assays (TEAC-, DPPH-, and TPC-assay) in combination with HPLC measurements, to qualify and quantify their chemical compositions, were used. Firstly, the drying methods affected the antioxidant activity of further processing stages, and outcomes were dependent on the species. Secondly, cooking increased the antioxidant activity due to higher concentrations of bioactive compounds, and released bound compounds through the rupture of cell structures. Furthermore, fridge storage (3 days at 7 °C) resulted in the lowest antioxidant activity, compared to freezer storage (30 days at −20 °C). Added 5-caffeoylquinic acid (0.3 mM) led to an increased antioxidant activity, most noticeably in freeze-dried samples. Synergistic effects of 5-caffeoylquinic acid were primary found in freeze-dried samples, analyzed fresh or after storage in the fridge. Metal-chelates can lower the antioxidant activity in plant matrices. Edible wild green vegetables are rich in polyphenols and processing can even increase their concentrations to boost the potential health effects. In general, selected quantified phenolics are not solely responsible for the antioxidant activity; minerals, processing, and interactions in plant matrices also contribute decisively."],["dc.description.sponsorship","Division Quality and Sensory of Plant Products, Georg-August-Universität Göttingen, Germany"],["dc.description.sponsorship","Open Access Publication Funds of Göttingen University"],["dc.identifier.doi","10.3390/plants11202710"],["dc.identifier.pii","plants11202710"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/118258"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-621"],["dc.relation.eissn","2223-7747"],["dc.rights","CC BY 4.0"],["dc.title","Edible Wild Vegetables Urtica dioica L. and Aegopodium podagraria L.–Antioxidants Affected by Processing"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.version","unpublished"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","7698"],["dc.bibliographiccitation.issue","24"],["dc.bibliographiccitation.journal","Molecules"],["dc.bibliographiccitation.volume","26"],["dc.contributor.author","Engelhardt, Layla"],["dc.contributor.author","Pöhnl, Tobias"],["dc.contributor.author","Neugart, Susanne"],["dc.date.accessioned","2022-01-11T14:05:26Z"],["dc.date.available","2022-01-11T14:05:26Z"],["dc.date.issued","2021"],["dc.date.updated","2022-02-09T13:19:51Z"],["dc.description.abstract","Bioactive compounds in fruit and vegetables influence each other’s antioxidant activity. Pure standards, and mixtures of the common plant compounds, namely ascorbic acid, 5-caffeoylquinic acid, and quercetin-3-rutinoside (sum 0.3 mM), in the presence and absence of iron, were analyzed pre- and post-thermal processing in an aqueous solution. Antioxidant activity was measured by total phenolic content (TPC), 1,1-diphenyl-2-picrylhydrazyl (DPPH), and 2,2′-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) (TEAC) radical-scavenging assays. Ionic ferrous iron (Fe2+) and ferric iron (Fe3+) were measured photometrically. For qualification and quantification of reaction products, HPLC was used. Results showed that thermal processing does not necessarily lead to a decreased antioxidant activity, even if the compound concentrations decreased, as then degradation products themselves have an antioxidant activity. In all used antioxidant assays the 2:1 ratio of ascorbic acid and 5-caffeoylquinic acid in the presence of iron had strong synergistic effects, while the 1:2 ratio had strong antagonistic effects. The pro-oxidant iron positively influenced the antioxidant activity in combination with the used antioxidants, while ferrous iron itself interacted with common in vitro assays for total antioxidant activity. These results indicate that the antioxidant activity of compounds is influenced by factors such as interaction with other molecules, temperature, and the minerals present."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2021"],["dc.identifier.doi","10.3390/molecules26247698"],["dc.identifier.eissn","1420-3049"],["dc.identifier.pii","molecules26247698"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/97662"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-507"],["dc.relation.eissn","1420-3049"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0/"],["dc.title","Interactions of Ascorbic Acid, 5-Caffeoylquinic Acid, and Quercetin-3-Rutinoside in the Presence and Absence of Iron during Thermal Processing and the Influence on Antioxidant Activity"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]