ABSTRACT The synthesis of five mono- and five bis-alkynylated derivatives of quinoline-5,8-diones is reported. The intermediate 6,7-dibromoquinoline-5,8-dione was obtained by nitrosation of 8- hydroxyquinoline, followed by reduction and subsequent bromination and oxidation. The coupling reaction of 6,7-dibromoquinoline-5,8-dione via palladium-catalyzed Sonogashira cross-coupling gave the alkynylated products. The chemical structures of the products were confirmed using spectroscopic methods ...
ABSTRACT The potentials of Adansonia digitata root (ADRP) and stem powders (ADSP) and the stem activated carbon (ADSAC) for adsorption of Pb2+, Cd2+, Cu2+ and Co2+ from aqueous solutions were investigated. The activated carbon was prepared via chemical activation using ZnCl2 as the activating agent. Physico-chemical analysis of the adsorbents (ADRP, ADSP and ADSAC) showed the moisture contents (< 20 %), volatile matter (9.2 - 11.2 %), ash content showed < 5.0 %, fixed carbon (68 - 81.0 %...
ABSTRACT The effects of temperature, dielectric constant and catalysis in the kinetics of the oxidation –reduction reactions (involving electron transfer) of N-(2-hydroxy-ethyl) ethylenediammine- N’,N’,N’-Triacetatocobalt (II) by Cu2+ cation were determined. The dielectric constant was decreased from 63.05 to 43.18 and it was found that the rates of the reaction did not show any appreciable change. This seems to mean that the change in the dielectric constant of the medium had no e...
ABSTRACT The synthesis, characterization and preliminary antimicrobial studies of some novel Schiff base ligands; N,N/ - Bis(2-hydroxybenzylidene)-1,4-phenylenediimine(M) and N,N/ - Bis(4-dimethylaminobenzylidene)-1,4-phenylenediimine (N) were undertaken. It was prepared by the condensation reaction of 1,4-phenylenediamine with 4-dimethylaminobenzadehyde and 2-hydroxybenzaldehde .Their Co(II), Mn(VII), Mo(VII) metal complexes were synthesized by coupling them respectively with the indivi...
ABSTRACT The discovery of bioactive natural products is a basis for development of novel pharmaceuticals. Indigenous medicinal plants which are largely unexplored offer chemical diversity with structural complexity and biological potency. Despite their ethnomedicinal usage, there is little information on the bioactive components of Dioclea reflexa and Cussonia arborea. This study was designed to isolate and characterise the secondary metabolites from the roots of D. reflexa and C. arborea, an...
ABSTRACT The soils and leaves of fluted pumpkin (Telfairia occidentalis), African spinach, "Green" (Amaranthus hybridus) and water leaf (Talinum triangulare) were collected as randomly composite samples from four (4) different study locations of two (2) each from Owo Local Government Area and Etsako-West Local Government Area. The samples were examined for heavy metal concentrations, using X-ray fluorescence (XRF) technique. Chromium (Cr), zinc (Zn), manganese (Mn), iron (Fe), titanium (Ti), ...
Pengembangan Teknologi Kimia untuk Daya Alam Indonesia Yogyakarta, 5 2014 Hak Cipta ada pada Program Studi Teknik Kimia Teknologi Industri UPN “Veteran” Yogyakarta Jl. SWK 104 (Lingkar Utara) Condongcatur, Yogyakarta (55283) Dilarang mengutip sebagian atayhu seluruh buku ini atau diperbanyak dengan tujuan komersial dalamre bentuk apapun tanpa seign Program Studi szeknik Kimia Fakultas Teknologi Industri UPN “Veteran” Yogyakarta, kecuali untuk keperluan Cetakan I : Maret 2014
Abstract: The synthesis and characterization of new complex monoaza and pentaaza angular phenothiazine derivatives is reported. The first derivative, 6,10-dichloro-17-azadibenzo[a,n]triphenodithiazin-5,11-dione 10 was obtained by a basecatalyzed reaction of 2,6-diaminopyridine-3,5-dithiol 5 and 2,3-dichloro-1,4-naphthaquinone 9, while the second derivative, 7,9,15,17-tetraamino-6,8,16,18,25-pentazadibenzo[a,n]di([1,4]benzothaizino[3,2-c,l])triphenodiathizine 11 was obtained by the reaction o...
ABSTRACT Antibiotic resistance has become one of the major problems facing humanity. The need for new antimicrobials has been increased dramatically. Plants are considered as a major sources of new antibiotics due to the presence of phytochemicals. In Nigeria and other developing countries medicine plant materials have been used to treat various diseases since ancient times. The goal of our research is to evaluate the phytochemical and antimicrobial efficiency of Ficus sycamorus leaf extracts...
An investigation was carried out to identify the different types of polymers used in paint and surface coatings and variations of the final products upon modifications of the materials used. The process of manufacturing paint and surface coatings involves a great deal of understanding various molecular behavior of paint and surface coatings polymeric matrix. These advance knowledge helps in developing new and advanced modifications of the super polymers. Every desire of a paint and surface co...
1.0 INTRODUCTION Vitamin A is a group of unsaturated nutritional organic compounds that includes retinol, retinal, retinoic acid, and several provitamin A carotenoids (most notably beta-carotene). Vitamin A has multiple functions: it is important for growth and development, for the maintenance of the immune system and good vision (Fennema, 2018). Vitamin A is needed by the retina of the eye in the form of retinal, which combines with protein opsin to form rhodopsin, the light-absorbing ...
Delonix regia popularly known as the flamboyant plant because of its onyx attractive color has been generally cultivated in the tropics. Although it was widely cultivated in the 19th century, yet the native habitat of the flamboyant tree was unknown until the 1930s, when it was retraced to native growing in the wild in Madagascar. The uses of Delonix regia as binders in drugs, adhesives, stabilizers, etc. have been some of its numerous applications in the field of science and biomedicine and ...
ABSTRACT Alkaloids are bioactive material mainly obtained from plant with pharmacological activities of one kind or another. The main aim of the present study was to extract and isolate alkaloid from Asystasia gangetica. The extraction of alkaloids from Asystasia gangetica was carried out with methanol using Soxhlet apparatus. Isolation was then followed by fractionating using acid and base in a separating funnel. The percentage alkaloid was determined and the phytochemicals screening...
ABSTRACT Polycyclic Aromatic Hydrocarbons are some of the known organic pollutants resulting from incomplete combustion of organic matter. They have been found to be carcinogenic, mutagenic and teratogenic. Much of the previous works on Polycyclic Aromatic Hydrocarbons have been on foods, water, dumpsites and on soil generally. However, this study focuses particularly on soils contaminated with Polycyclic Aromatic Hydrocarbons as a result of a widely used agricultural practice of farmland cle...
Sorption properties of hydrolyzed starch graft poly (acrylic acid) and starch graft poly(acrylonitrile) copolymers as sorbents for the removal of Cd (II) and Cu(II) ions from aqueous solution in batch process were assessed. The copolymers were prepared using methods as reported in literature and were characterized in terms of morphology using scanning electron microscopy, confirmation of sorbents produced using Fourier transform infrared spectroscopy and thermal stability using thermogravimet...