Lineariifolianoids I–L, four rare sesquiterpene lactone dimers inhibiting NO production from Inula lineariifolia

Abstract

Four unsymmetrical sesquiterpene lactone dimers were isolated from Inula lineariifolia. The absolute configurations of 1 and 2 were established by X-ray crystallographic analyses.

Electrochemical monitoring of ROS influence on seedlings and germination response to salinity stress of three species of the tribe Inuleae

“…The studied species are rich in secondary compounds such as avonoids, sesquiterpenes and essential oils. [35][36][37][38][39][40][48][49][50] In the case of D. viscosa it has been reported that the concentration of leaf exudate phenolics increases under water stress. 50 In a recent work, Kheyar-Kraouche et al 19 study by HPLC-MS the composition and antioxidant activity of an ethanolic extract of D. viscosa leaves, identifying phenolic acids, avonoids, terpenoids and one lignan.…”

“…The voltammetric method exploits the electroactive character of polyphenolic compounds, (lignins, avonoids, avonols, avones, ..) abundantly represented in the leaves of the tribe. [35][36][37][38][39][40] Most of these components display well-known oxidations of o-catechol units to the corresponding oquinones highly sensitive to the overall molecular structure. [20][21][22][23][30][31][32][33][34]41,42 Ultimately, the current work was aimed to provide an analytical tool to be used in the botanic science frame to acquire 'direct' mechanistic information on ROS reactivity and its relation with biochemical processes that is unavailable from the usual HPLC methodologies.…”