TY  - JOUR
A1  - Yenesew, Abiy
A1  - Twinomuhwezi, Hannington
A1  - Kiremire, Bernard T.
A1  - Mbugua, Martin N.
A1  - Gitu, Peter M.
A1  - Heydenreich, Matthias
A1  - Peter, Martin G.
T1  - 8-Methoxyneorautenol and radical scavenging flavonoids from Erythrina abyssinica
N2  - A new pterocarpan (named 8-methoxyneorautenol) was isolated from the acetone ext. of the root bark of Erythrina abyssinica. In addn., the known isoflavonoid derivs. eryvarin L, erycristagallin and shinpterocarpin were identified for the first time from the roots of this plant. The structures were detd. on the basis of spectroscopic evidence. The new compd. showed selective antimicrobial activity against Trichophyton mentagrophytes. The acetone ext. of the root bark of E. abyssinica showed radical scavenging activity towards 2,2-diphenyl-1-picrylhydrazyl radical (DPPH). The pterocarpenes, 3-hydroxy-9-methoxy-10-(3,3-dimethylallyl)pterocarpene and erycristagallin, were the most active constituents of the roots of this plant and showing dose-dependent activities similar to that of the std. quercetin. [on SciFinder (R)]
Y1  - 2009
UR  - http://www.ajol.info/journal_index.php?jid=120&ab=bcse
SN  - 1011-3924
ER  - 
TY  - JOUR
A1  - Fettke, Anja
A1  - Peikow, Dirk
A1  - Peter, Martin G.
A1  - Kleinpeter, Erich
T1  - Synthesis and conformational analysis of glycomimetic analogs of thiochitobiose
N2  - The synthesis of six analogs of N,N;-diacetylchitobiose is reported, including a novel transglycosylation reaction for the preparation of S-aryl thioglycosides. The conformations of the compounds were studied by a combination of NMR spectroscopy and molecular modeling, using force field calculations. In the case of the S-aryl thioglycosides with exclusively S-glycosidic linkages, dihedral angles of the disaccharidic S-glycosidic bonds, ;; and ;; and of the S-arylglycoside bonds, ; and ;, were found to be similar, whereas they were different in mixed glycosides and in a thiazoline derivative. An adequate correlation between the calculated H,H-distances of the local minima and the measured NOE contacts was achieved by applying population-weighted averages over participating conformers based on weighted relative energies.
Y1  - 2009
UR  - http://www.sciencedirect.com/science/journal/00404020
U6  - https://doi.org/10.1016/j.tet.2009.03.067
SN  - 0040-4020
ER  - 
TY  - JOUR
A1  - Menezes, Bruno M.
A1  - Grigolon, Lisanne
A1  - Todorovic, Zoran
A1  - Peter, Martin G.
A1  - Franco, Telma T.
T1  - On the depolymerization of chitosan by papain : a re-assessment
Y1  - 2009
ER  - 
TY  - JOUR
A1  - Issaree, Arisara
A1  - Vijayakrishnan, Balakumar
A1  - Abdelnur, Patricia V.
A1  - Corilo, Yuri E.
A1  - Riccio, Maria F.
A1  - Sanvido, Gustavo B.
A1  - Eberlin, Marcos N.
A1  - Peter, Martin G.
T1  - Mass spectrometry of aminoglucan oligosaccharides using electrospray ionization MS/MS and MS/MS/MS
Y1  - 2009
ER  - 
TY  - GEN
A1  - Peter, Martin G.
A1  - Yenesew, Abiy
A1  - Twinomuhwezi, Hannington
A1  - Kabaru, Jacques M.
A1  - Akala, Hoseah M.
A1  - Kiremire, Bernard T.
A1  - Heydenreich, Matthias
A1  - Eyase, Fredrick
A1  - Waters, Norman C.
A1  - Walsh, Douglas S.
T1  - Antiplasmodial and larvicidal flavonoids from Derris trifoliata
N2  - From the dichloromethane-methanol (1:1) extract of the seed pods of Derris trifoliata, a new flavanone derivative (S)-lupinifolin 4´-methyl ether was isolated. In addition, the known flavonoids lupinifolin and rotenone were identified. The structures were determined on the basis of spectroscopic evidence. Lupinfolin showed moderate in vitro antiplasmodial activity against the D6 (chloroquine-sensitive) and W2 (chloroquineresistant) strains of Plasmodium falciparum. The different parts of this plant showed larvicidal activities against Aedes aegypti and rotenoids were identified as the active principles.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - paper 121 
KW  - Derris trifoliata
KW  - Leguminosae
KW  - Flavanone
KW  - (S)-Lupinifolin 4´-methyl ether
KW  - Lupinifolin
Y1  - 2009
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-44614
ER  - 
TY  - GEN
A1  - Peter, Martin G.
A1  - Muiva, Lois M.
A1  - Yenesew, Abiy
A1  - Derese, Solomon
A1  - Heydenreich, Matthias
A1  - Akala, Hoseah M.
A1  - Eyase, Fredrick
A1  - Waters, Norman C.
A1  - Mutai, Charles
A1  - Keriko, Joseph M.
A1  - Walsh, Douglas S.
T1  - Antiplasmodial β-hydroxydihydrochalcone from seedpods of Tephrosia elata
N2  - From the seedpods of Tephrosia elata, a new β-hydroxydihydrochalcone named (S)-elatadihydrochalcone was isolated. In addition, the known flavonoids obovatachalcone, obovatin, obovatin methyl ether and deguelin were identified. The structures were determined on the basis of spectroscopic evidence. The crude extract and the flavonoids obtained from the seedpods of this plant showed antiplasmodial activities. The literature NMR data on β-hydroxydihydrochalcones is reviewed and the identity of some of the compounds assigned β-hydroxydihydrochalcone skeleton is questioned.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - paper 118 
KW  - Tephrosia elata
KW  - Leguminosae
KW  - Seedpods
KW  - (S)-Elatadihydrochalcone
KW  - β-Hydroxydihydrochalcone
Y1  - 2009
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-44437
ER  -