Geschmack ist vorhersagbar: Mit FlavorMiner. FlavorMiner heißt das Tool, das IPB-Chemiker und Partner aus Kolumbien jüngst entwickelt haben. Das Programm kann, basierend auf maschinellem Lernen (KI), anhand der…
Seit Februar 2021 bietet Wolfgang Brandt, ehemaliger Leiter der Arbeitsgruppe Computerchemie am IPB, sein Citizen Science-Projekt zur Pilzbestimmung an. Dafür hat er in regelmäßigen Abständen öffentliche Vorträge zur Vielfalt…
de Gouveia Baratelli, T.; Candido Gomes, A. C.; Wessjohann, L. A.; Machado Kuster, R.; Kato Simas, N.;Phytochemical and allelopathic studies of Terminalia catappa L. (Combretaceae)Biochem. Syst. Ecol.41119-125(2012)DOI: 10.1016/j.bse.2011.12.008
The allelopathic potential of Terminalia catappa L. Combretaceae fruits and leaves on Lactuca sativa L. (lettuce), Euphorbia heterophylla L. and Commelina benghalensis L. was studied. Bioassays indicated the highest activity for dichloromethane and ethyl-acetate fractions of ethanolic extracts from fruits, and the mean effective concentration (EC50) was determined. 2-Pentadecanone; vanillic, siringic, ferulic, p-coumaric, palmitic and stearic acids were characterized in the dichloromethane fraction, and 3,4,4′-tri-O-methyl ellagic acid and β-sitosterol-3-O-β-d-glucoside were isolated from it. No allelopathic effects were observed when the dichloromethane extracts of T. catappa fruit or leaf extracts were applied to the weeds E. heterophylla and C. benghalensis. Bioassays with seasonal sampling revealed an influence on the allelochemical potential of T. catappa. Considering the methodology adopted and the experimental results, the allelopathic activity of T. catappa seems to be related to the interaction of different groups of substances, some of them identified and characterized in this work.
Publikation
Thien, D. G.; Hoang Anh, N. T.; Porzel, A.; Franke, K.; Wessjohann, L.; Van Sung, T.;Triterpene acids and polyphenols from Eriobotrya poilaneiBiochem. Syst. Ecol.40198-200(2012)DOI: 10.1016/j.bse.2011.11.001
The occurrence of flavolignans might be a valuable chemotaxonomic marker for the classification of Rosaceae species.
Publikation
Zanetsie Kakam, A. M.; Franke, K.; Ndom, J. C.; Dongo, E.; Mpondo, T. N.; Wessjohann, L. A.;Secondary metabolites from Helichrysum foetidum and their chemotaxonomic significanceBiochem. Syst. Ecol.39166-167(2011)DOI: 10.1016/j.bse.2011.02.005
The occurrence of tetracyclic kauran type diterpenoids or related structures might be a valuable chemotaxonomic marker for further classification and subdivision of the polyphyletic genus Helichrysum.