- Ethnobotanical and Medicinal Plants Studies
- Advanced Cellulose Research Studies
- Essential Oils and Antimicrobial Activity
- Nanocomposite Films for Food Packaging
- Nanoparticles: synthesis and applications
- Helminth infection and control
- Natural Antidiabetic Agents Studies
- Insect Pest Control Strategies
- Botanical Research and Chemistry
- Natural product bioactivities and synthesis
- Polydiacetylene-based materials and applications
- Supramolecular Self-Assembly in Materials
- Laser-Ablation Synthesis of Nanoparticles
- Environmental remediation with nanomaterials
- Advanced Nanomaterials in Catalysis
- biodegradable polymer synthesis and properties
- Insect and Pesticide Research
- Biofuel production and bioconversion
- Parasites and Host Interactions
- Electrocatalysts for Energy Conversion
- Fuel Cells and Related Materials
- Seed and Plant Biochemistry
- Parasite Biology and Host Interactions
- Phytochemicals and Antioxidant Activities
- Plant and fungal interactions
Jomo Kenyatta University of Agriculture and Technology
2014-2024
Kenya Medical Research Institute
2017
Mount Kenya University
2017
Division of Chemistry
2010
In recent ages, green nanotechnology has gained attraction in the synthesis of metallic nanoparticles due to their cost-effectiveness, simple preparation steps, and environmentally-friendly. present study, copper oxide (CuO NPs) were prepared using Parthenium hysterophorus whole plant aqueous extract as a reducing, stabilizing, capping agent. The CuO NPs characterized via UV-Vis Spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), powder X-Ray Diffraction (XRD), Scanning Electron...
Herein, we report a stimuli-responsive hydrogel with inhibitory activity against Escherichia coli prepared by chemical crosslinking of carboxymethyl chitosan (CMCs) and hydroxyethyl cellulose (HEC). The hydrogels were esterification (Cs) monochloroacetic acid to produce CMCs which then chemically crosslinked HEC using citric as the agent. To impart stimuli responsiveness property hydrogels, polydiacetylene-zinc oxide (PDA-ZnO) nanosheets synthesized in situ during reaction followed...
Biopolymers are natural polymers produced by the cells of living organisms such as plants and microbes rather than from fossil fuel. They consist monomeric units that covalently bonded to form larger molecules making up a 3D macromolecule network which when crosslinked either physically or chemically, they can produce hydrogel. These covalent crosslinks be attained using various approaches result stabilize hydrogels them appropriate biomaterials for applications. The cross links short long,...
Cellulose is an inexpensive, renewable, bio-based and abundant raw material suitable for the development of filter membranes water purification.This because it has numerous functional groups that afford ease modification to create active surfaces upon chemical modification.In this study, cellulose was isolated from two biomasses, namely, Eichhornia crassipes Cyperus papyrus using soda process followed by bleaching with peracetic acid.The percent yield nanofibrils (CNF) obtained E. C. found...
Water shortage and scarcity are issues of global concern. pollution caused by organic micropollutants further aggravates the problem, rendering an already scarce resource unfit for human consumption. The existing conventional wastewater treatment methods infrastructure were not designed to eliminate micropollutants. Therefore, their inefficiencies call modern removing emerging micropollutant residues such as Active Pharmaceutical Ingredients (APIs), Endocrine Disrupting Compounds (EDCs),...
Herein, zinc oxide nanoparticles (ZnO NPs) were synthesized using Parthenium hysterophorus whole plant aqueous extract as reducing and capping agents. The ZnO NPs characterized via UV-Vis spectroscopy, Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission (TEM), X-ray diffraction (XRD), dynamic light scattering (DLS). An intrinsic optical absorbance of occurred at 337 nm in the spectrum. FTIR analysis revealed presence secondary metabolites...
To attain the zero waste and green chemistry goals, much emphasis has shifted toward use of cellulose derived from agricultural biomass. In this study, carboxymethylation microcrystalline coconut fiber by monochloroacetic acid in presence an alcohol medium under alkaline conditions was suitable for synthesis carboxymethyl cellulose. The prepared, physical properties, degree substitution, swelling capacity, characterization were investigated. results indicated that yield cellulose, capacity...
Abstract This work demonstrates our effort to develop stimuli responsive cellulose films for the detection of dimethyl amines, a biogenic amine, released during food decomposition. Herein, we demonstrate that thin layer deposition polydiacetylene‐zinc oxide nanosheets (PDA‐ZnO) on (CE) paper yields strip exhibiting strong thermochromism and solvatochromism against amine. The incorporation Zn nanoclusters within composite plays an essential role in achieving reversible while intermolecular...
Abstract Fungal resistance and the environmental degradation posed by conventional fungicides necessitate need to develop new antifungal agents that can inhibit fungal growth. This study sought prepare biofungicides leveraging on activity of copper‐metal organic framework (Cu‐MOF) dialdehyde chitosan (Cs) isolated from black soldier flies (BSF). Cs were oxidized using potassium periodate obtain (OCs) thereafter, Cu‐MOF was loaded resulting in Cu‐MOF‐OCs. Fourier Transform Infrared...
In this study, Tithonia diversifolia Helms. (A Gray), Aloe secundiflora (Miller) and Azadirachta indica (A. Juss) plant extracts were used to make herbal soaps while Thevetia peruviana (Schum) seed oil was a lotion for skincare. The tested the growth inhibition of Escherichia coli, Candida albicans. evaluated against Staphylococcus aureus E.coli. Although soap exhibited highest inhibitory effect on test bacterial strains, it had least C. Results from study indicated that 'Tithonia...
Cellulose nanocrystals (CNCs) or cellulose nanofibers (CNFs) with different morphologies, chemical, mechanical and physical properties can be obtained when microcrystalline is subjected to enzymatic, chemical treatment. With the aim of utilizing nanofibrils from Oryza sativa, we isolated using Kraft process, followed by successive fiber fibrillation grinding, then (2,2,6,6-Tetramethylpiperidin-1-yl)oxyl (TEMPO) mediated oxidation. Analysis pulp fibers after each treatment step revealed that...
Eleven medicinal plants used by traditional healers in Machakos and Kitui District were screened, namely: Ajuga remota Benth, Aloe secundiflora Engl, Amaranthus hybridus L, Cassia didymobotrya Fes, Croton macrostachyus Del, Entada leptostachya Harms, Erythrina abyssinica DC, Harrisonia Oliv, Schkuhria pinnata O. Ktze, Terminalia kilimandscharica Engl Ziziphus Hochst for potential antibacterial activity against four medically important bacterial strains, Bacillus cereus ATCC 11778,...
Recent findings of microplastics in marine food such as fish, crabs and shrimps necessitate the need to develop biodegradable packaging materials. This study reports on development a packing material from cellulose nanofibril-polyvinyl alcohol nanocomposite embedded with silver nanoparticles. Microcrystalline was isolated sugarcane bagasse via kraft process followed by conversion I II using NaOH/urea/water solution. The nanofibrils were then (2,2,6,6-Tetramethylpiperidin-1-yl) oxyl (TEMPO)...
This data article reports contents of the information derived from an efficient, environmentally friendly, and low-cost method synthesis recovery iron nanoparticles using Galinsoga parviflora, Conyza bonariensis Bidens pilosa aqueous leaf extracts as reducing, stabilizing, capping agents, applications in degradation organic dyes antibiotics. Various spectroscopic microscopic techniques were used to collect data. Data is displayed form .raw files, graphs, images, Microsoft Excel sheets, .data...
Thevetia peruviana (Pers.) K. Schum. seed oil was used to make a surface coating with antifungal, antibacterial and anti-termite properties. The paint exhibited inhibitory activity against Escherichia coli, Staphylococcus aureus, Bacillus subtilis Candida albicans in concentration dependent manner. activities were statistically significant (p = 0.05). repellent action of subterranean termites (Microtermes spp.) 0.03). From these results, it concluded that the peruviana-based self-preserving...
The large amounts of coffee husks (CHs) waste matter generated from farms and factories has been considered as a new non-wood source cellulose. aim this work was to fabricate an edible food packaging material starch incorporating TEMPO-oxidized cellulose nano-fibrils (TOCNFs) hibiscus extracts boost its mechanical antibacterial properties respectively. In study, three schemes were employed enhanced novel nanocomposite film starch, TOCNF Firstly, glycerol used the plasticizer on formation...
Microcrystalline cellulose (MCC) powders extracted from banana stem, rice straws, water hyacinth and papyrus reeds were investigated for their physicochemical properties.Preparation of the MCC was carried out using alkali hydrolysis process followed by further treatment peracetic acid.The lignocellulosic biomasses first treated with aqueous sodium hydroxide to remove lignin hemicelluloses a solution acid at 80 0 C 2 hours residual hemicellulose.The obtained then bleached 20% hydrogen...