Department of Chemistry: Recent submissions
Now showing items 81-100 of 337
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Production and characterization of activated carbons from sugarcane bagasse from Chemelil sugar factory, compared with commercial activated carbons
(Journal of Engineering in Agriculture and the Environment, 2020)In Kenya activated carbon is imported yet we have enough bagasse that can be used in its production. The activated carbon from bagasse adds economic value to the bagasse and the processing excess bagasse provides for ... -
Effect of kaolin pre-treatment method and NaOH levels on the structure and properties of kaolin-derived faujasite zeolites
(Royal Society of Chemistry, 2021)Fusion with NaOH is considered effective in the conversion of kaolin to soluble aluminosilicates. However, to date, there is no consistency in the nature and type of zeolite structures prepared from kaolin via this approach, ... -
Comparative Economic Analysis of Clonal Tea Yield Response to Nitrogen Fertiliser Rates within Selected Geographical Areas in Kenya
(INTERNATIONAL JOURNAL OF TEA S, 2020)Tea sector contributes approximately 30% of export earnings in Kenya. Despite the industry continuing to realize positive gross margins, high costs of production coupled with weak trends in export prices threaten its ... -
Influence of Nitrogenous Fertilizer Rates and Plucking Intervals on Tea in Peatland and Highland Ultisol Soils of Rwanda: 1 Tea Yields
(International Journal of Tea Science, Volume 15 Issue 1 (2020, 2020)Tea in Rwanda, is grown in different agro-ecosystems comprising highlands and drained low elevation peatlands. The plantations use uniform agricultural practices imported from Eastern Africa countries, but without re-testing ... -
Phytochemistry and insecticidal activity of Annona mucosa leaf extracts against Sitophilus zeamais and Prostephanus truncatus
(Taylor and Francis, 2021)A new oleanane type triterpene characterized as 3a, 24-diacetoxy12-oleanene (1) together with known compounds 2-10, were isolated from Annona mucosa leaf extracts. Their structural elucidation was accomplished using ... -
New compounds with antimicrobial activities from Elaeodendron buchananii stem bark
(Journal of Asian Natural Products Research, 2018)The plant species Elaeodendron buchananii Loes is widely used in folklore medicine to manage microbial infections in Kenya. Previous studies on the plant fruits and root bark revealed the presence of steroids and ... -
Toward a size scale-up cold sintering process at reduced uniaxial pressure
(Journal of America ceramic library, 2019)Cold sintering is a low-temperature powder process methodology that enables the densification of ceramics and ceramic-based composites at significantly reduced times and temperatures. Although the general notion of required ... -
2-Hydroxysorangiadenosine: Structure and Biosynthesis of a Myxobacterial Sesquiterpene–Nucleoside
(Multidisciplinary Digital Publishing Institute, 2020)Myxobacteria represent an under-investigated source for biologically active natural products featuring intriguing structural moieties with potential applications, e.g., in the pharmaceutical industry. Sorangiadenosine and ... -
Sources, distribution, and risk assessment of organochlorine pesticides in Nairobi City, Kenya. Journal of Environmental Sciences, 96, 178–185
(Elsevier, 2020)The distribution and sources of organochlorine pesticides (OCPs) in air and surface waters were monitored in Nairobi City using triolein-filled semipermeable membrane devices (SPMDs). The SPMDs were extracted by dialysis ... -
Nitrogenous Fertilizer Rates and Plucking Intervals Effects on Soil Organic Carbon, pH and Tea Yields and Their Relationships in Eastern Africa Tea Growing Regions
(International Society of Tea Science, 2020)Eastern Africa tea grows in high rainfall areas where nutrients depletion through leaching, and surface run-off can be high, in addition to removal with crop. Nutrients replenishment through fertilizer applications is ... -
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 ...
