Browsing Journal Articles (PAS) by Author "Manguro, Lawrence O.A."

Now showing items 1-9 of 9

    • 7a-Acetylugandensolide and antimicrobial properties of Warburgia ugandensis extracts and isolates against sweet potato pathogens 

      Opiyo, Sylvia A.; Manguro, Lawrence O.A.; Okinda-Owuor, Philip; Ateka, E.M.; Lemmen, Peter (Elsevier, 2011)
      7a-Acetylugandensolide together with thirteen known drimane-type sesquiterpenes have been isolated from Warbugia ugandensis bark extracts. Their structures were established by spectroscopic and physical methods as well as ...

    • Antimicrobial Compounds from Terminalia brownii against Sweet Potato Pathogens 

      Opiyo, Sylvia A.; Manguro, Lawrence O.A.; Owuor, Philip O.; Ochieng, Charles O.; Ateka, E.M.; Lemmen, Peter (Bentham Science Publishers, 2011)
      Phytochemical evaluation of Terminalia brownii extracts led to the isolation of five compounds namely - sitosterol, stigmasterol, monogynol A, betulinic acid and arjungenin. Their structures were established by spectroscopic ...

    • Antimicrobial Constituents Of Conyza Floribunda 

      Opiyo, Sylvia A.; Manguro, Lawrence O.A. (WebmedCentral, 2010-09)
      The study describes the antibacterial and antifungal effects of both CH2Cl2 and MeOH crude extracts, collected fractions and pure isolates of Conzya floribunda. The antimicrobial activity tests were carried out using agar ...

    • Bioactive Constituents of Conyza floribunda 

      Opiyo, Sylvia A.; Manguro, Lawrence O.A.; Ogur, Joseph A.; Wagai, Samuel Otieno (Medwell Journals, 2010)
      The study describes the antibacterial and antifungal effects of both CH2Cl2 and MeOH crude extracts, collected fractions and pure isolates of Conzya floribunda. The antimicrobial activity tests were carried out using agar ...

    • Biopesticidal Extractives and Compounds from Warburgia Ugandensis against Maize Weevil (Sitophilus zeamais) 

      Opiyo, Sylvia A.; Manguro, Lawrence O.A.; Akinyi, Dorothy; Ochung, Anjeline A.; Ochieng, Charles O. (Bentham Science Publishers, 2015)
      Agricultural production is constrained by insect pests, which cause serious post-harvest losses of up to 43% in developing countries. Maize weevil (Sitophilus zeamais Motschulsky.) is one of the most destructive pests of ...

    • A New Sterol Diglycoside from Conyza floribunda 

      Opiyo, Sylvia A.; Ogur, Joseph A.; Manguro, Lawrence O.A.; Tietze, Lutz F.; Schuster, Heiko (The South African Journal of Chemistry, 2009)
      Chemical investigation of CH2Cl2 and MeOH extracts of Conyza floribunda have led to the isolation of (24S)-ethylcholesta-5, 22E, 25-trien-3-O-glucosyl (1” 4’)-rhamnoside (1), (24S)-ethylcholesta-5,25-dien-3-O- -glucoside ...

    • Phytoecdysteroids from the Stem Bark of Vitex doniana and Their Anti-Inflammatory Effects 

      Ochieng, Charles O.; Ishola, Ismail O.; Opiyo, Sylvia A.; Manguro, Lawrence O.A.; Owuor, Philip O.; Wong, Keng-Chong (Georg Thieme Verlag, 2012-10)
      With reference to the ethnopharmacological significance of Vitex doniana Sweet (Lamiaceae) leaves in the treatment of stomach and rheumatic pains as well as inflammatory disorders, biological studies on its stem bark ...

    • Triterpenes from Elaeodendron schweinfurthianum and their Antimicrobial Activities against Crop Pathogens 

      Opiyo, Sylvia A.; Manguro, Lawrence O.A.; Owuor, Philip O.; Ateka, E.M. (Scientific & Academic Publishing, 2017)
      Phytochemical evaluation of Elaeodendron schweinfurthianum (Loes) extracts led to the isolation of nine compounds which were identified as 3-oxofriedelane (1), 3α-hydroxyfriedelane (2), 3-oxo-29-hydroxyfriedelane (3), ...

    • Triterpenes of Commiphora holtziana oleo-gum resin 

      Manguro, Lawrence O.A.; Opiyo, Sylvia A.; Herdtweck, Eberhardt; Lemmenc, Peter (NRC Research Press, 2009-07)
      Chemical analysis of the acetone extract of Commiphoraholtziana gum resin has led to the isolation of triterpenes characterized as methyl 3-oxo-1α,19α,28-trihydroxyurs-12-en-24-oate (1), methyl 3β-acetyl-2α,11α,19α,28-te ...