Browsing Department of Chemistry by Title
Now showing items 303-322 of 323
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Ursane and tirucallane-type triterpenes of Boswellia rivae oleo-gum resin
(Taylor &Francis, 2016)Two new ursane-type triterpenes characterized as 3-oxo-24-acetoxy11α-hydroxy-urs-12-ene (1) and methyl 3α-acetoxy-11α-methoxyurs-12-en-24-oate (2), together with known compounds 3–11, were isolated from Boswellia rivae ... -
The use of green tea (Camellia sinensis) leaf flavan-3-ol composition in predicting plain black tea quality potential
(Elsevier, 2007-12-13)Reliable and quantifiable green leaf parameters for predicting black tea quality potential of tea bushes at the single bush stage are necessary to shorten tea breeding and clonal selection programmes. Green leaf ... -
The use of green tea (Camellia sinensis) leaf flavan-3-ol composition in predicting plain black tea quality potential
(Elsevier, 2007-01-01)Reliable and quantifiable green leaf parameters for predicting black tea quality potential of tea bushes at the single bush stage are necessary to shorten tea breeding and clonal selection programmes. Green leaf flavan-3-ols ... -
Utilization of fruit waste substrates in mushroom production and manipulation of chemical composition
(Elsevier, 2022-01)The current study evaluated the effect of mushroom cultivation using fruit waste substrates on yield performance and antioxidant activities. The total phenolic content and the 2, 2-diphenyl-1-picrylhydrazyl (DPPH) radical ... -
Validated RP-UHPLC PDA and GC–MS methods for the analysis of psychoactive alkaloids in Sceletium tortuosum
(Elservier, 2012)Anecdotal evidence indicates that Sceletium tortuosum has been used as a psychoactive preparation for several centuries. The psychological activity is attributed to the production of mesembrine-type alkaloids (mesembrenol, ... -
Validated RP-UHPLC PDA and GC–MS methods for the analysis of psychoactive alkaloids in Sceletium tortuosum
(Elsevier, 2012)Anecdotal evidence indicates that Sceletium tortuosum has been used as a psychoactive preparation for several centuries. The psychological activity is attributed to the production of mesembrine-type alkaloids (mesembrenol, ... -
Variability of overhead volatile organic compounds in clonal tea (Camellia sinensis) and their influence on red crevice mite (brevipalpus phoenicis geijskes) infestati...
(2016)Tea production in Kenya is under threat due to red crevice mites (Brevipalpus phoenicis) infestations during droughts. Cultural pests control practices, eg use of resistant/tolerant cultivars are used in their control ... -
Variation in catechin composition of popularly cultivated tea clones in East Africa (Kenya)
(2013)Variation in catechin composition of popularly cultivated tea clones in East Africa (Kenya) -
Variation in indoor levels of polycyclic aromatic hydrocarbons from burning various biomass types in the traditional grass-roofed households in Western Kenya
(Elsevier, 2011-07-31)Biomass burning as fuel in the traditional grass-roofed rural households of Western Province of Kenya in open fire places, in poorly ventilated conditions, lead to accumulation of soot under the roofs. This study ... -
Variations in Camellia sinensis (L) Leaf Nutrients and Polyphenols Levels with Genotypes, Nitrogenous Fertilizer Rates, Season and Plucking Intervals in Eastern Africa Tea Growing Regions
(Mase University, 2013)In Eastern Africa, teas are grown in high rainfall areas causing fast nutrients depletion. Foliar nutrients diagnostic limits developed for seedling tea have been in use since 1970s and they have been adopted for clonal ... -
Variations in soil pH, N, P and K due to influence of rates, split applications of nitrogen fertilizer and ratoon crop of sugarcane varieties
(ResearchGate, 2023)Fertilizer Best Management Practices (BMPs) include soil testing that is performed to determine the availability of essential elements for profitable and productive yields of crops. The objective of this research was to ... -
Variations in the Precursors of Plain Black Tea Quality Parameters Due to Location of Production and Nitrogen Fertilizer Rates in Eastern African Clonal Tea Leaves
(Cambridge University Press, 2016-04)Summary Theaflavins contribute to astringency and brightness while thearubigins contribute to colour and mouth feel of black tea. Green leaf flavan-3-ols influence levels and distribution of theaflavins and thearubigins ... -
Variations in the Volatile Flavour Compounds Composition of Selected Nerica Rice Varieties Grown in Different Agro-Ecological Zones in Lake Victoria Basin, Kenya
(Maseno University, 2017)Rice (Oryza sativa L.) is a staple food consumed worldwide. Some rice cultivars are preferred over others due to their distinctive aroma which contributes to consumer acceptability and increased economic importance. New ... -
Variations of fatty acids levels in young shoots of clonal tea with location of production and nitrogenous fertilizer rates in the Kenya highlands
(Journal of Agricultural Science and Technology, 2012)Tea leaves contain unsaturated fatty acids, key precursors of volatile compounds contributing to tea aroma quality. Tea is cultivated in areas with diverse environmental conditions. Nitrogenous fertilizers influence tea ... -
Variations of Fatty Acids Levels in Young Shoots of Clonal Tea With Location of Production and Nitrogenous Fertilizer Rates in the Kenya Highlands
(Journal of Agricultural Science and Technology, 2012)Tea leaves contain unsaturated fatty acids, key precursors of volatile compounds contributing to tea aroma quality. Tea is cultivated in areas with diverse environmental conditions. Nitrogenous fertilizers influence tea ... -
Voulkensin C–E, new 11-oxocassane-type diterpenoids and a steroid glycoside from Caesalpinia volkensii stem bark and their antiplasmodial activities
(Pergamon, 2013-05-15)A bioassay guided isolation of potential antimalarial molecules from the stem bark of Caesalpinia volkensii Harms (Fabaceae) achieved three new 11-oxocassane-type diterpenoids named voulkensin C (1), D (2) and E (3) together ... -
Water Quality of Selected Fishing Beaches of Lake Victoria Kenyan Gulf
(Scientific Research Publishing, 2020-01-06)Lake Victoria the second largest fresh water body in the world located in East Africa is a shared resource between Kenya, Tanzania and Uganda and enjoys a wide range of streams and rivers from as far as Burundi and Rwanda. ... -
Yield response of tea clone 6/8 to growing environments, nitrogenous fertiliser application and plucking intervals in East Africa.
(Inter-University Council for East Africa Lake Victoria Research Initiative, 2011)In East Africa, tea growing areas fall in several agro-ecological regions, differing widely in elevation and climatic factors. Despite the differences, agronomic inputs are uniform throughout the region. Clone TRFK 6/8 is ... -
Yields and Nitrogenous Fertiliser Use Efficiency Responses of Clonal Tea (Camellia Sinensis) to Locations of Production
(International Journal of Tea Science Vol 13, No. 1&2 (2017) : 32-40, 2017)Tea husbandry practices in Kenya are uniform despite variations in responses to agronomic inputs with locations. Nitrogen availability is the most limiting tea/crop growth factor. However, tea yields vary with region of ...