Department of Chemistry: Recent submissions
Now showing items 81-100 of 326
-
Effects of processing technologies on chlorogenic acid, gallic acid and theanine in selected Kenyan tea cultivars
(Tea Research Institute, Kenya, 2018)Tea (Camellia sinensis) is popular for its high levels of polyphenols which are attributed to its antioxidant properties. However, other associated biomolecules are also potent antioxidants and contribute to health effects. ... -
The potential of Zea mays, Commelina bengelensis, Helianthus annuus and Amaranthus hybridus for phytoremediation of waste water
(Instituto de Pesquisas Ambientais em Bacias Hidrográficas, 2012-12)Waste-water from domestic use and from industrial effluent burden the water systems with high levels of heavy metal hence there is need to remove these heavy metals so that the waste water can be recycled for use for ... -
Potential of novel phytoecdysteroids isolated from Vitex doniana in the treatment depression: Involvement of monoaminergic systems
(Elsevier, 2014-12-01)Vitex doniana Sweet (Verbanaceae) is used in traditional African medicine for the treatment of neurological disorders including depression. In our previous studies, three new phytoecdysteroids were isolated from methanol ... -
Antioxidant activities oftriacontanyl-E-cinnamoatesmetabolites from Caesalpinia volkensii root bark extracts
(Research gate, 2017)Natural antioxidants have been reported to prevent oxidative damage caused by free radicals generated during biochemical processes and thus useful in prevention of several degenerative diseases. The present study evaluated ... -
Isolation of a new β-carboline alkaloid from aerial parts of Triclisia sacleuxii and its antibacterial and cytotoxicity effects
(Taylor & Francis, 2017-03-04)A new β-carboline alkaloid named sacleuximine A (1) together with known compounds palmatine (2), isotetrandrine (3), trans-Nferuloyltyramine (4), trans-N-caffeoyltyramine (5), yangambin (6), syringaresinol (7), sesamin ... -
Cyclooxygenase inhibitory compounds from Gymnosporia heterophylla aerial parts
(Elsevier, 2017-06-01)Gymnosporia heterophylla (Celastraceae) is an African medicinal plants used to treat painful and inflammatory diseases with partial scientific validation. Solvent extractions followed by repeated chromatographic ... -
Analgesics from Lonchocarpus eriocalyx Harms
(Islamic Azad University, Shahrood Branch Press,, 2018-12-15)Four lupane-type terpenoids, namely lupeol (1), friedelin (2), stigmasterol (3), and stigmasterol-3-O-glucoside (4) were isolated from the ethyl acetate extract of leaves of Lonchocarpus eriocalyx Harms. These compounds ... -
α-Amylase and α-glucosidase inhibitors from Zanthoxylum chalybeum Engl. root bark
(Elsevier, 2020-10-01)A systematic analysis of the root bark of Zanthoxylum chalybeum was conducted to establish the antidiabetic potential of isolated compounds based on its ethnomedicinal use to manage diabetes. Chromatographic separation of ... -
Pretreatment with natural flavones and neuronal cell survival after oxidative stress: a structure− activity relationship study
(Journal of agricultural and food chemistry, 2010)Quercetin shows structural features that have been related to the antioxidant potency of flavonoids and also shows neuroprotection in different models of oxidative death. Because only a few studies have focused on the ... -
Mechanisms of Analgesic and Anti-Inflammatory Properties of Annona muricata Linn. (Annonaceae) Fruit Extract in Rodents
(Journal of medicinal food, 2014)Unripe fruit of Annona muricata Linn. (Annonaceae) (soursop) is used in traditional African medicine for the treatment of neuralgia, rheumatism, and arthritic pain. This study sought to investigate the analgesic and ... -
Flavonoids from Tephrosia interrupta and T. linearis.
(CABI DIRECT, 1990)In east Africa, medicinal uses have been reported for the roots of T. interrupta (coughs and treatment of women after childbirth) and the leaves of T. linearis ([unspecified] diseases in infants). Flavonoid analyses are ... -
Isolation and chemical characterisation of pyrrolisidine alkaloids from some senecio
(University of Calgary, 1991) -
Errata. Pyrrolizidine Alkaloids from Senecio hadiensis
(American Chemical Society, 1991-09)17-Oxosparteine (1 mg), -isolupanine (3 mg), and N-methylcytisine (2 mg) were iden- tified by ms and tic comparisons with authentic samples (6,8). Catalytic reduction (2 mg) of 5,6-dehydrolu- panine (4 mg), oil, ms (9) ... -
Ruwenine and ruzorine: Pyrrolizidine alkaloids of Senecio ruwenzoriensis
(Pergamon, 1992-09-01)A reinvestigation of Kenyan Senecio ruwenzoriensis reported to contain two alkaloids of unknown structures, ruwenine and ruzorine, resulted in the isolation of the pyrrolizidine alkaloid isoline, accompanied by what appeared ... -
The pyrrolizidine alkaloids of Senecio syringifolius and S. hadiensis from Kenya
(Pergamon, 1993-01-01)Angularine, rosmarinine and 12-O-acetylrosmarine, together with their N-oxides were isolated from epigeal parts of S. syringifolius, while -
Chinchona Alkaloid from Dendrosenecio kilimanjari subsp. cottonii
(Georg Thieme Verlag Stuttgart· New York, 1997-02)Investigation of the Tanzanian Dendrosenecio kilimanjari subsp. cottonii resulted in the isolation of the cinchona alkaloid, cinchonidine (2). Conversion of cinchonidine to deoxy-cinchonidine was achieved in high yield ... -
Improved biodegradation of 1,2,4-trichlorobenzene by adapted microorganisms in agricultural soil and in soil suspension cultures
(Pedosphere, 2011)Inoculating soil with an adapted microbial community is a more effective bioaugmentation approach than inoculation with pure strains in bioremediation. However, information on the potential of different inocula from sites ... -
Enhancement of degradation of DDT and HCB in tropical clay soils in model experiments
(Technische Universität München, 2010)This study sought to enhance the degradation of two persistent organic pollutants (POPs) – DDT and HCB – in two tropical clay soils in model laboratory experiments. Anaerobic-aerobic cycles and amendment with compost were ... -
Degradation capacity of a 1, 2, 4-trichlorobenzene mineralizing microbial community for traces of organochlorine pesticides
(Elsevier, 2010-07-15)A soil-borne microbial community isolated from a contaminated site was previously shown to mineralize 1,2,4-trichlorobenzene (1,2,4-TCB) under aerobic conditions. The key degrader in this community was identified as ... -
Effects of autoclaving and mercuric chloride sterilization on PAHs dissipation in a two-liquid-phase soil slurry
(Elsevier, 2011-02-01)A two-liquid-phase (TLP) soil slurry system was employed to quantify the efficiencies of autoclaving and mercuric chloride sterilization in the dissipation of polycyclic aromatic hydrocarbons (PAHs). The fates of 11 PAHs ...