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    Flavonoids from Trifolium resupinatum var. microcephalum
    (Springer, 2007) Isik, Emel; Sabudak, Temine; Oksuz, Sevil
    [Abstract Not Available]
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    Lipid constituents of Trifolium resupinatum var. microcephalum
    (Taylor & Francis Ltd, 2007) Sabudak, Temine; Isik, Emel; Oksuz, Sevil
    The two new compounds (3-methyl-l-nonene-3-ol and 2',3'-dih,ydroxy propyl pentadecanoate) and four known compounds were isolated from Trifolium resupinatum L. var. microcephalum Zoh. (Leguminosae). All the compounds were reported for the first time from this plant. The stuructures of the isolates were determined by I D, 2D NMR techniques and MS spectroscopy.
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    Potent tyrosinase inhibitors from Trifolium balansae
    (Taylor & Francis Ltd, 2006) Sabudak, Temine; Khan, Mahmut Tareq Hassan; Choudhary, M. Iqbal; Oksuz, Sevil
    Trifolium balansae ( Leguminosae) yielded a phytylester, phytyl-1-hexanoate, three steroids, stigmast-5-ene-3 beta,26-diol, stigmast-5-ene-3-ol and campesterol, and an alcohol, pentacosanol which were reported for the first time from T. balansae. The structures of the isolates were determined by 1D and 2DNMR techniques and MS spectroscopy. Compounds 1 - 5 were tested for their enzyme tyrosinase activity. While compounds 1 and 5 did not show any inhibition against the enzyme tyrosinase, compounds 2, 3, and 4 exhibited potent inhibition against tyrosinase. Highly potent ( IC50 = 2.39 mu M) inhibition was found by compound 2, when compared with the standard tyrosinase inhibitors Kojic acid and L-mimosine.
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    Two new compounds from Trifolium resupinatum var. microcephalum
    (Taylor & Francis Ltd, 2008) Sabudak, Temine; Isik, Emel; Oksuz, Sevil
    An investigation of CH2Cl2 and EtOH extracts of Trifolium resupinatum L. var. microcephalum Zoh. has led to the isolation of two new compounds characterized as 4,15-dimethyl-2-(1,2-dihydroxyethyl)-hexadecene (1) and 1-undecene-1-O--2',3',4',6'-tetraacetyl glucopyranoside (2a). Their structures were established by 1D and 2D NMR techniques, and mass spectroscopy.