[Not Available].

Koronawirusy wywołują choroby dróg oddechowych, przewodu pokarmowego i centralnego układu nerwowego, które zagrażają zdrowiu ludzkiemu i przyczyniają się do strat ekonomicznych. Nowatorskie technologie wytwarzania powodują możliwość wykorzystania związków bioaktywnych jako czynników przeciwwirusowych. Większość owoców, warzyw oraz produktów pochodzenia roślinnego zawiera w składzie flawonoidy.

[Not Available].

Flawonoidy to grupa roślinnych metabolitów wtórnych mająca szereg właściwości prozdrowotnych, wykazująca działanie zarówno profilaktyczne jak i lecznicze. Badania  potwierdzają, że flawonoidy działają  m.in.

Effects of Larch Woolly Adelgid Infestation on Morphological, Histological and Allelochemical Traits of European Larch Needles.

The study was carried out to assess the effect of the larch wooly adelgid Vallot (Hemiptera: Adelgidae) infestation on its secondary host, the European larch Mill. Morphology and anatomy of adelgid-infested needles, and content of defense phenolic compounds including individual flavonoids isorhamnetin, kaempferol, quercetin, rutin, catechin, epicatechin, apigenin, ampelopsin and taxifolin, were analyzed. The amount of total phenols in needles from adelgid-infested twigs of increased following the development of the population, from the end of April until the end of June.

Antixenosis in Glycine max (L.) Merr against Acyrthosiphon pisum (Harris).

To reveal the antixenosis potential against the pea aphid Acyrthosiphon pisum (Harris) (Hemiptera: Aphididae) we analyzed the pea aphid survival and probing behavior, and the quantitative and qualitative variation of flavonoids in the leaves of selected soybean Glycine max (L.) Merr (Fabaceae) cultivars 'Aldana', 'Annushka', 'Augusta', 'Madlen', 'Mavka', 'Simona', 'Violetta', and 'Viorica'. Aphid survival was drastically impeded on all cultivars.

Characterisation of honeys according to their content of phenolic compounds using high performance liquid chromatography/tandem mass spectrometry.

A simple, fast and specific high performance liquid chromatography separation with an electro-spray ionisation tandem mass spectrometry detection in a negative single reaction ion monitoring scan mode was developed and used for the characterization of Polish honeys according to the content of phenolic acids, including caffeic, chlorogenic, p-coumaric, ferulic, homogentisic, p-hydroxybenzoic and vanillic acids, and flavonoids, i.e., apigenin, genistein, hesperetin, kaempferol, luteolin, rhamnetin, rutin, tricetin and quercetin.

Suitability of three-dimensional synchronous fluorescence spectroscopy for fingerprint analysis of honey samples with reference to their phenolic profiles.

The suitability of a right-angle geometry three-dimensional synchronous fluorescence spectroscopy (3D-SFS) for the differentiation and classification of different honey types, including acacia, buckwheat, heather, linden, multiflower and rape honeys, was evaluated with reference to their phenolic profiles. The fraction of phenolic compounds was initially isolated and pre-concentrated from analyzed samples by means of polymeric reversed phase Strata X solid phase extraction (SPE) cartridges. A thoughtful analysis of 3D-SF spectra of resulting methanolic extracts of honey samples containing the separated fraction of phenolics and standards of phenolic acids and flavonoids revealed that the proposed methodology based on SPE and 3D-SFS is capable of discriminating honey samples due to different floral sources in a fast and straightforward way.

Determination of the total content of calcium and magnesium and their bioavailability in ripened bee honeys.

An analytical scheme for the fractionation and the determination of Ca and Mg in different bee honeys is presented. Using tandem column solid phase extraction based on a nonionic macroreticular adsorbing resin Amberlite XAD-16 and a gel-type strong cation exchange resin Dowex 50Wx8-200, three different groups of the Ca and Mg species were separated, including the hydrophobic, the cationic, and the residual species fractions. The concentrations of Ca and Mg were measured by means of flame atomic absorption spectrometry without any special chemical preparation of the analyzed samples.