Determining Antiradical Capacity of Medicinal Plant Extract Individual Constituents Using Post-Column Reaction Method.

The post-column reaction method enables the evaluation of the antiradical capacity of individual components in a mixture by separating the components using HPLC and measuring stable free radical (e.g., DPPH●) scavenging that occurs after the chromatography column.

Chemical Diversity of Wild-Growing and Cultivated Common Valerian ( L. s.l.) Originating from Poland.

Common valerian is a medicinal plant. The underground organs of this species are used as a mild sedative and sleeping aid. Poland is one of the largest producers of this raw material in Europe, with local cultivar 'Lubelski' as a primary cultivated form.

Comparison of the Chemical Composition and Antioxidant Properties of Propolis from Urban Apiaries.

Bee products from urban apiaries are increasingly used. They are mainly used to promote local apiaries and cities in which they are located. The aim of the study was to compare the chemical composition and antioxidant activity of propolis from 6 Polish apiaries located in cities (Legionowo, Torun, Cracow, Warsaw, Katowice, Lodz).

Intraspecific Variability of Stinging Nettle ( L.).

The purpose of the work was to determine the intraspecific variability of the stinging nettle, in respect of the mass of leaves and their chemical composition, including the content of phenolic compounds and assimilative pigments. The objects of the study were 10 populations of nettle, originating from the eastern and southern part of Poland. The results obtained indicate a high level of variability between and within the populations investigated but not strictly related to their geographical locations.

Antioxidant and Antibacterial Activity of Essential Oils and Hydroethanolic Extracts of Greek Oregano (. L. subsp. (Link) Ietswaart) and Common Oregano (. L. subsp. ).

Greek oregano and common oregano were compared in respect of the antioxidant and antibacterial activity of the corresponding essential oils and hydroethanolic extracts in relation with their chemical profile. The chemical composition of essential oils was determined by GC-MS and GC-FID, while extracts (phenolic acids and flavonoids fractions) were analyzed by HPLC-DAD. Based on given volatiles, the investigated subspecies represented two chemotypes: a carvacrol/γ-terpinene/-cymene type in the case of Greek oregano and a sabinyl/cymyl type rich in terpinen-4-ol in common oregano.

The Quality of Greek Oregano (. L. Subsp. (Link) Ietswaart) and Common Oregano (. L. Subsp. ) Cultivated in the Temperate Climate of Central Europe.

The purpose of the study was to determine the differences between two subspecies: . L. subsp.

Chemical Diversity of Bastard Balm ( L.) as Affected by Plant Development.

The phytochemical diversity of was investigated in terms of seasonal changes and age of plants including plant organs diversity. The content of phenolics, namely: coumarin; 3,4-dihydroxycoumarin; -coumaric acid 2--glucoside; verbascoside; apiin; luteolin-7--glucoside; and -coumaric; -coumaric; chlorogenic; caffeic; ferulic; cichoric acids, was determined using HPLC-DAD. Among these, luteolin-7--glucoside, verbascoside, chlorogenic acid, and coumarin were the dominants.

Effect of Shading on Development, Yield and Quality of Bastard Balm Herb ( L.).

The aim of the study was to assess the effects of shading on its development and accumulation of phenolics. Their content (verbascoside, apiin, luteolin-7--glucoside, coumarin, 3,4-dihydroxycoumarin, -coumaric acid 2--glucoside as well as -coumaric, -coumaric, chlorogenic, caffeic, ferulic and cichoric acid) was determined in the herb using HPLC-DAD. The results showed that the content of abovementioned flavonoids and phenolic acids was highest in plants grown under full sunlight.

Bioactive compounds, total antioxidant capacity and yield of kiwiberry fruit under different nitrogen regimes in field conditions.

Background: Actinidia arguta known as the 'kiwiberry' or 'mini kiwi' is relatively new among the cultivated berry species. Recent studies indicate the kiwiberry fruit could be an important source of many health-promoting compounds. A knowledge-based fertilisation concept was evolved to define optimal strategies for feeding Actinidia with nitrogen (N) because a deficit and excess of N both have a negative impact on plants and the surrounding environment.

Antibacterial and Antioxidant Activity of Extracts from Rose Fruits ().

The aim of the present study was to determine the antioxidant and antimicrobial properties in freeze-dried extracts of rose fruits () obtained using various extraction techniques and to determine the effect of a selected extract on bacterial survival in model fluids imitating protein food. Ethanolic extracts from rose fruits showed higher antioxidant activity compared to other tested extracts. The rose fruits aqueous extract showed the highest inhibitory activity against most of the 10 bacterial strains tested.

Growth Biocontrol of Foodborne Pathogens and Spoilage Microorganisms of Food by Polish Propolis Extracts.

Propolis is a natural mixture produced by bees from plant resin substances. This study focuses on the general characteristics of five samples of Polish extract propolis originating from agricultural areas. Chemical composition with high performance liquid chromatography‒diode array detector method, total content of flavonoids and polyphenols, and antioxidative activity were determined in the ethanol extracts of propolis (EEP) samples.

Antioxidant and Antibacterial Activity of Roseroot (Rhodiola rosea L.) Dry Extracts.

Roseroot ( L.) belongs to plants revealing adaptogenic properties, which are attributed to the presence of specific phenolic compounds and are reflected mainly as antioxidant activity. The aim of the present study was to determine the antioxidant and antibacterial activity of various products obtained from (underground organs as well as their aqueous and ethanolic dry extracts) in relation to the chemical profiles of phenolic and essential oil compounds.

Phenolics in L. and (L.) Hill Raw Materials.

L. and (L.) Hill represent medicinal plants used for the production of herbal teas and preparations with antioxidant and expectorant activity.

Effect of meadowsweet flower extract-pullulan coatings on rhizopus rot development and postharvest quality of cold-stored red peppers.

The study involved an examination of the antifungal activity on red peppers of pullulan coating (P) and pullulan coating containing either water-ethanol (P + eEMF) or ethanol extract of meadowsweet flowers (P + eEMF). Pullulan was obtained from a culture of Aureobasidium pullulans B-1 mutant. Both non-inoculated peppers and those artificially inoculated with Rhizopus arrhizus were coated and incubated at 24 °C for 5 days.