Chemistry Research Papers/Topics

Comparison of the phytochemical composition of Euclea divinorum Hern (Ebenaceae) leaves, tender stems and root bark

Abstract uclea divinorum Hern (Ebenaceae) has a long history of folkloric use in the treatment of different diseases. However, there are few reports on the responsible phytochemicals in its tender stems, leaves and root bark. The aim of this study was to compare the phytochemicals in E. divinorum leaves, tender stems and root bark. The plant materials were extracted serially by maceration with dichloromethane, hexane and ethanol. Alkaloids, phenols, saponins, flavonoids, steroids, cardiac gl...

Meyer-Neldel rule for Cu (I) diffusion in In2S3 layers

Abstract The nature of barriers for atomic transport in In2S3 layers has been varied by addition of chlorine. Diffusion of Cu(I) from a removable CuSCN source was used to probe the variation of the barriers. The Meyer-Neldel (compensation) rule was observed with a Meyer-Neldel energy (EMN) and a proportionality prefactor (D00) amounting to 40 meV and 5 × 10−14 cm2/s, respectively. D00 shows that the elementary excitation step is independent of the specific mechanism and nature of th...

Comparative effects of nitrogen, phosphorus and potassium on Radopholus similis infection in East African Highland Banana plants as influenced by rhizosphere biota

Abstract Root parasitism by Radopholus similis may vary under different nutritional conditions and soil substrates. Such variations in nematode infection may affect deductions from evaluations of pest control measures. Three parallel factorial experiments (nutrients × soil sterility × nematode) were conducted to investigate the effects of N-P-K and soil biota on R. similis infection and banana plant growth. Chlorophyll content was lower in plants receiving N-deficient solution or w...

Factors associated with uncorrected refractive errors in school-going adolescents in Kakamega County, Kenya

Abstract Background: Uncorrected refractive errors (URE) present an enormous burden on children in Kenya. The study investigated factors associated with URE in school-going adolescents in Kakamega County, Kenya. Material and methods: An observational, cross-sectional study with multistage sampling was conducted with randomly selected secondary school students in forms one to four. Comprehensive clinical examinations conducted by optometrists were used to determine participants’ URE types a...

Occurrence and Distribution of Per- and Polyfluoroalkyl Substances from Multi-Industry Sources to Water, Sediments and Plants along Nairobi River Basin, Kenya

Abstract Per- and polyfluoroalkyl substances (PFAS) are ever-present pollutants in the environment. They are persistent and bio-accumulative with deleterious health effects on biota. This study assesses the levels of PFAS in environmental matrices along the Nairobi River, Kenya. An aggregate of 30 PFAS were determined in water, while 28 PFAS were detected in sediments and plants using solid phase extraction then liquid chromatography–mass spectrometric techniques. In water, higher levels o...

Semiochemical signatures associated with differential attraction of Anopheles gambiae to human feet

Abstract Background Several human-produced volatiles have been reported to mediate the host-seeking process under laboratory conditions, yet no effective lure or repellent has been developed for field application. Previously, we found a gradation of the attractiveness of foot odors of different malaria free individuals to Anopheles gambiae sensu stricto Giles. In this study, foot odor of the individual with the most attractive ‘smelly’ feet to the An. gambiae was collected, analyzed and ...

Stability and Kinetics Studies Using an RP- HPLC-UV Method Developed for Assays of Salvianolic Acid A Degradation as a Therapeutic

Abstract Aims: To evaluate the stability of Salvianolic acid A (SAA), a promising cardiovascular drug candidate. Additionally avail an archetype in-vitro therapeutic monitoring from SAA degradation profile for characteristic oral gavages. Study Design: Experimental by laboratory analysis. Place and Duration of Study: Department of Chemistry & Biochemistry, Moi University; Department of Pure & Applied Chemistry and Department of Medical Laboratory Sciences of Masinde Muliro University of Scie...

Phytochemical Screening and Antimicrobial Activity of Kenyan Mushroom Ganoderma lucidum

Abstract Aim: To screen the Kenyan Ganoderma lucidum for phytochemicals and to investigate it's potential in the management of some disease-causing microbes. Study Design: Hexane, ethyl acetate and methanol extraction; phytochemical study and anti-microbial activities were analysed on Kenyan G. lucidum mushroom. Place and Duration of Study: Masinde Muliro University Science laboratories from January 2019 and March 2019. Methodology: Sequential extraction of dried samples was done using hexan...

Synthesis of mesoporous akaganeite functionalized maize cob biochar for adsorptive abatement of carbamazepine: Kinetics, isotherms, and thermodynamics

Abstract In this work, akaganeite (β-FeO(OH)) impregnated maize cob biochar (Fe-MCB) was prepared by direct hydrolysis, and its adsorptive potential was tested against aqueous solutions of carbamazepine (CBZ), an emerging contaminant. The adsorbent was characterized by standard methods, namely XRD, SEM-EDX, FT-IR, BET surface area analysis, and VSM. Fe-MCB exhibited mesoporous textural structure with paramagnetic behavior at room temperature. The equilibrium data were modeled using the Lang...

Optimized Dyeing of Cotton with semi-synthetic Embelin Ninhydrin Dye Obtained by Chemical Modification of Embelin from Embelia Schimperi

Abstract Chemical modification is a promising path to address the limitations of a natural dye, such as limited shades and inadequate fastness properties. This study investigated the modification of embelin (2, 5-dihydroxy-3-undecyl-1, 4-benzoquinone) a plant-based benzoquinone compound from Embelia schimperi (Myrisinaceae family) with ninhydrin to get a semi-synthetic dye. The modified dye was applied to cotton fabric along with mordants to provide different shades. Optimum dyeing condition...

In vivo antibacterial activity of extracts of Tithonia diversifolia against Ralstonia solanacearum in tomato

Abstract Currently, losses in crop yields caused by Ralstonia solanacearum have led to the overuse of synthetic pesticides, which are toxic and non-biodegradable hence detrimental to the environment. This study, therefore, investigated the in vivo antibacterial activity of ethanolic and hexane extracts from Tithonia diversifolia against R. solanacearum in tomatoes. Extraction was performed using the maceration method followed by evaluation of the extraction yields. During the in vivo greenho...

Synthesis, Characterization, and Evaluation of the Remediation Activity of Cissus quadrangularis Zinc Oxide Nanoparticle-Activated Carbon Composite on Dieldrin in Aqueous Solution

Abstract In this study, zinc oxide-activated carbon nanocomposite was used as the adsorbent for the remediation of dieldrin in aqueous media. Zinc oxide nanoparticles (ZNPs) were synthesized from Cissus quadrangularis (C. quadrangularis) leaf extract, and activated carbon was derived from maize cobs. Nanocomposites were formulated by mixing the ZNPs with the activated carbon in a ratio of 1 : 50. The UV-Vis spectra showed a complete reduction of Zn2+ to Zn0 with plasmon resonance bands i...

Evaluation of dyeing properties of natural dyes extracted from the heartwood of Prosopis juliflora on cotton fabric

Abstract Purpose Considered as one of the most unwanted species by the International Union for Conservation of Nature, the Prosopis juliflora plant is a noxious and invasive weed. Recent studies suggest that the heartwood of the plant has an unusually high amounts of flavonoids with potential medicinal properties and dyeing potentials. In this work, acetonic extracts were successfully valorized into a natural dye. Design/methodology/approach After extraction and optimization of dyeing condit...

Phytochemical Composition and Antibacterial Activity of Fruit Extract of Solanum incanum L. against Ralstonia solanacearum

Abstract Aims: To determine the phytochemical composition and antibacterial activity of Solanum incanum fruits against Ralstonia solanacearum. Study Design: Experimental design involving completely randomized design Place and Duration of Study: The study was conducted at department of Chemistry and Biochemistry, School of Sciences and Aerospace studies, Moi University, Kenya, between January and June 2021. Original Research Article Karanja et al.; AJACR, 9(4): 1-16, 2021; Article no.AJACR.75...

Volatile aroma chemical constituents of fruit pulp of some Kenyan varieties of mango (Mangifera indica L.)

Abstract Volatiles are key constituents of mango fruit aroma and vital in defining fruit quality besides influencing consumer preferences. In this paper, volatiles of eight Kenyan mango varieties: Ngowe, Apple, Keitt, Boribo, Tommy Atkins, Van Dyke, Sabre and Kent were collected on porapak Q adsorbent filters (mesh 40-80μm) using air entrainment kit and analyzed by Gas Chromatography (GC) and GC coupled to a Mass Spectrometer. Fifty-eight compounds, representing monoterpenes (66.1%), esters...


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