Growth-inhibitory activity of phenolic compounds applied in an emulsifiable concentrate - ferulic acid as a natural pesticide against Botrytis cinerea.

Phenolic compounds are part of the protection system of plants against all kinds of pests and are therefore considered a natural alternative to conventional plant protection agents. Five phenolic compounds (phlorizin, resveratrol, ferulic acid, 5-n-alkylresorcinols, and quercetin) were used as active ingredients in the preparation of a bioactive emulsion and screened for their ability to inhibit the growth of four phytopathogenic fungi - Aspergillus niger, Botrytis cinerea, Penicillium expansum, and Fusarium culmorum. By using design of experiments, several interactions between the phenols were determined, however, ferulic acid was identified as highly effective against the growth of Botrytis cinerea.

Growth suppression of Fusarium culmorum, Fusarium poae and Fusarium graminearum by 5-n-alk(en)ylresorcinols from wheat and rye bran.

Alk(en)ylresorcinols (AR), a class of phenolic lipids, are regarded as antifungal compounds showing high potential for the use in plant protection, especially against Fusarium head blight (FHB). In view of the very limited knowledge of the activity of single AR against Fusarium species, the antifungal effect of crude extracts, fractions and isolated homologues from wheat and rye bran was determined. It was shown that the saturated AR are the active compounds in the extracts, whereas the presence of unsaturated molecules leads to an antagonistic effect.

Separation of alk(en)ylresorcinols from rye bran with saturated, monoenoic, dienoic, trienoic and hydroxylated monoenoic side chains using an octyl phase in ultra-high performance liquid chromatography and their differentiation by tandem mass spectrometrie.

Alkylresorcinols (ARs) occur in bran of cereals and in fruits from the Anacardiaceae family. Their separation by liquid chromatography is challenging, especially in rye (Secale cereale L.) that has a complex AR composition.

Separation and isolation of saturated and unsaturated 5-n-alk(en)ylresorcinols from rye bran.

Alkylresorcinols (AR) are a class of phenolic lipids which are found in a number of plants and microorganisms and which are associated with various biological activities. In view of the very limited availability of reference compounds, we developed a process for the isolation of AR from rye bran. For this purpose, a crude extract was subjected to deep bed filtration at -80 °C, whereby the crystallized saturated AR were separated from the unsaturated homologues.