Bioactive constituents of Iris hybrida (Iridaceae): Processing effect

Iris genus plants are a valuable source of bioactive compounds, which are an important component for pharmaceutical development. The present article shows the potential for mineral nutrition with application of magnesium sulfate, iron chelates and potassium oxide affecting the phenolic compound contents in Iris hybrida ‘Tsikavynka’, I. hybrida ‘Tambo’ and I. hybridа ‘Widecombe Fire’. The effect of mineral processing was specific to plant organs and varied in the component composition. The Iris rhizomes had an increased total phenolic compound content after treatment (up to 10% of the total isoflavonoid content, up to 8% of phenolic acids, up to 5% of γ-pyrones and up to 13% of flavonoids), determined using UV–vis spectroscopy. A positive effect of nutrition on the biosynthesis and content of individual isoflavonoids (tectoridin, nigricin d -glucoside, genistin, iristectorigenin B, nigricin, irigenin and irisolidone) and xanthone mangiferin in Iris rhizomes by HPLC was established. In addition, an increase in the chlorogenic acid amount in Iris leaves was noted. The results demonstrate the sensitivity of Iris phenylpropanoid metabolism to mineral nutrition and can be used to predict medical plant cultivation with increased content of bioactive constituents.     

New borides Er0.917Ni4.09B and ErNi7B3 and their crystal structures

New borides have been synthesized and their crystal structures have been determined using X-ray single-crystal methods, namely: Er_0.917Ni_4.09B, own structure type, space group P6/mmm, a=14.8399(3), c=6.9194(3) Å, R_F=0.0545, and ErNi₇B₃, own structure type, space group I4₁/amd, a=7.6577(2), c=15.5798(5) Å, R_F=0.0451. The relationship between these structures and the structure types of CeCo₄B, Y_0.915Ni_4.12B and Sc₄Ni₂₉B₁₀ has been discussed.