Publications by authors named "Irene Semay"
(Acanthaceae) leave extract was investigated for its flavonoid content. Column chromatography was used for compound isolation and mass spectrometry was performed using electrospray ionization (ESI) in the negative ion mode for compound identification. The full characterization of luteolin 7--[β-D-apiofuranosyl-(1 → 2)--β-D-ribofuranoside], a flavone glycoside, was achieved using tandem mass spectrometry and high resolution 1D and 2D Nuclear Magnetic Resonance (NMR).
View Article and Find Full Text PDFArticle Synopsis
- The study looked at how different diets and a gut parasite affect the bacteria living in bumble bee males' stomachs.
- Bumble bees were fed different types of pollen and either infected with a parasite or not, and scientists found that certain diets and the presence of the parasite changed the types of bacteria in their guts.
- The results suggest that both what bumble bees eat and whether they have a parasite can affect their gut bacteria, which is important for understanding how to keep bees healthy.
Article Synopsis
- Phenolamides, which are specialized metabolites made from hydroxycinnamic acids and polyamines, are crucial in flower development and pollen interactions.
- Their complex structural characteristics, including positional and stereoisomers, complicate their analysis through mass spectrometry, especially due to issues like collision-induced transamidation.
- This study examines the fragmentation processes of spermidine-based phenolamides and proposes two distinct pathways for their dissociation, suggesting that negative ion mode mass spectrometry may be more effective for identifying these compounds in natural extracts.
Specific floral resources may help bees to face environmental challenges such as parasite infection, as recently shown for sunflower pollen. Whereas this pollen diet is known to be unsuitable for the larval development of bumble bees, it has been shown to reduce the load of a trypanosomatid parasite () in the bumble bee gut. Recent studies suggested it could be due to phenolamides, a group of compounds commonly found in flowering plants.
View Article and Find Full Text PDF