RP-School of Pure and Applied Sciences

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Browsing RP-School of Pure and Applied Sciences by Subject "(−)-Pseudocurine and (−)-pseudoisocurine"

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    Bisbenzylisoquinoline and hasubanane alkaloids from Stephania abyssinica (Dillon & A. Rich) (Menispermeceae)
    (Elsevier, 2014-04-12) Hassanali, Ahmed; Omole, R. A.; Gathirwa, J.; Akala, H.; Malebo, H. M.; Machocho, Alex K.; Ndiege, I. O.
    From the leaves of Stephania abyssinica, three alkaloids were isolated: (−)-pseudocurine (1), (−)-pseudoisocurine (2) and (−)-10-oxoaknadinine (3). (−)-Pseudocurine and (-)-pseudoisocurine showed strong anti-plasmodial activity against both chloroquine-susceptible D6 and resistant strains of Plasmodium falciparum (IC50 0.29 ± 0.00 and 0.31 ± 0.01 μg/ml, respectively) while (−)-pseudoisocurine exhibited moderate and mild activity (0.75 ± 0.11 and 1.65 ± 0.03 μg/ml).
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    Bisbenzylisoquinoline and hasubanane alkaloids from Stephania abyssinica (Dillon & A. Rich) (Menispermeceae)
    (Elsevier, 2014-07) Hassanali, Ahmed; Omole, R. A.; Machocho, Alex K.; Ndiege, I. O.; Gathirwa, Jeremiah; Akala, Hosea; Malebo, Hamisi M.
    Two bisbenzylisoquinoline and one hasubanane alkaloids: (−)-pseudocurine (1), (−)-pseudoisocurine (2) and (−)-10-oxoaknadinine (3), were isolated from leaf extract of Stephania abyssinica, a plant used in traditional medicine in South Nyanza region of Kenya. They were characterized using 1D (1H, 13C and DEPT) and 2D (COSY, NOESY, HMQC and HMBC) NMR techniques. (−)-Pseudocurine (1) and (−)-pseudoisocurine (2) exhibited strong to moderate anti-plasmodial activity while (−)-10-oxoaknadinine (3) showed moderate to mild activity. ________________________________________ Graphical abstract From the leaves of Stephania abyssinica, three alkaloids were isolated: (−)-pseudocurine (1), (−)-pseudoisocurine (2) and (−)-10-oxoaknadinine (3). (−)-Pseudocurine and (-)-pseudoisocurine showed strong anti-plasmodial activity against both chloroquine-susceptible D6 and resistant strains of Plasmodium falciparum (IC50 0.29 ± 0.00 and 0.31 ± 0.01 μg/ml, respectively) while (−)-pseudoisocurine exhibited moderate and mild activity (0.75 ± 0.11 and 1.65 ± 0.03 μg/ml).