Regina E Ogali

• University of Port Harcourt

This study investigates the reprecipitation of crude oil maltene using lower carbon number solvents and reduced solvent volume. Single and binary n-alkane mixtures were used to induce composition changes in the crude oil. The resulting precipitates are fractionated and analyzed using UV-visible spectroscopy. The resin absorbance content increases w...

The article investigated the composition of cellulosic plants, so as to evaluate their potentials for the production of ethanol.

This research was aimed at observing the inhibiting effects of some substances that are said to be recalcitrant to enzymatic activities during the production of cellulosic ethanol, a source of liquid biofuels. The biomass used for this work was a perennial grass specie (Pernnisetum purpureum S.), which is a lignocellulosic biomass that is predomina...

Starch extraction from Icacina senegalensis (IS) and Cyrtosperma senegalense (CS) tubers was carried out with water at room temperature. The tubers of Icacina senegalensis and Cyrtosperma senegalense gave a starch yield of 40.9% and 25.5% respectively. The amylose, amylopectin composition of starches from IS and CS tubers were determined to be 10.8...

This study investigates the antibacterial activities of the stem bark extract of Dacryodes edulis. The aim of the study was to deduce the potency of the crude extracts and their metabolites from stem-barks of Dacryodes edulis on drug-resistant microbial pathogen(s). The stem bark of the plant was extracted with five solvents of different polarities...

5-hydroxymethylfurfural (5-HMF) yield during bioethanol production from starch was determined using spectrophotometry and chromatography. Increasing acid concentration and time favored 5-HMF production with HCl while yield decreased after 45-minute hydrolysis time for HNO3 and H2SO4 hydrolyzed samples. Impacts of glucose (substrate) concentration a...

A patent certificate for innovative work on bioethanol production

Starches serve as vital raw materials in many industrial applications especially in food, textile, pharmaceutical and petroleum industries. In petroleum industry, chemically modified starches are used in water based drilling mud to enhance fluid loss and viscosity in the formation during drilling. Most starches used for these applications are obtai...

This study deals with the synthesis of some selected substituted benzaldoximes from their corresponding benzaldehydes by the reaction of the alcoholic solution of the substituted benzaldehydes with hydroxylamine in the presence of sodium hydroxide (NaOH) using ethanol/water solution as solvent medium. Structural elucidation of the synthesized compo...

Oil exploration, exploitation, oil well fires and pipeline vandalism are often reported to lead to high levels of pollution of the environment affecting water, land and air. As a result, the safety of specific fish species for human consumption is constantly in doubt and needs assessment. Guinean tilapia (Tilapia guineensis) and Blackchin tilapia (...

Phytochemicals have been reported by many researchers as being responsible for pharmacological properties possessed by plants. In this research paper, ethanol, water, chloroform and petroleum ether extracts were obtained from leaves of Enantia chlorantha. Phytochemical screening was conducted for the four extracts of the leaves. Ethanol extract...

Approximately half of the world’s population is at risk of malaria, and about 250 million deaths are reported annually. There are two strategic approaches to malaria management: prevention (vector control, drug prophylaxis and potential use of vaccines) and treatment (drugs, blood transfusion, etc). The use of botanicals, specifically essential oil...

The antimicrobial potential of crude extracts, and fractions obtained from Azadirachta indica have been evaluated. Phytochemical screening of the extracts and metabolites revealed the presence of tannins, saponins, flavonoids, steroids/triterpenes, glycosides, phenols, carboxylic acids, esters, aldehydes and ketones. The antimicrobial activities of...

Studies were carried out on the characterization and extraction of coconut coir dust using water, acetone, acetone/ water (70/30), (50/50) respectively. The acetone extract of the coir dust was phytochemically screened for tannins, poly-phenols, flavanoids, phlobatannins. The moisture, ash, lignin, and cellulose contents of the coir dust were deter...

Studies were carried out on the characterization and extraction of coconut coir dust using water, acetone, acetone/ water (70/30), (50/50) respectively. The acetone extract of the coir dust was phytochemically screened for tannins, poly-phenols, flavanoids, phlobatannins. The moisture, ash, lignin, and cellulose contents of the coir dust were deter...

The objective of this study is to assess the removal of Cu (II) from aqueous solution onto coconut Cocos nucifera L. (coir dust). The effect of various parameters has been investigated by batch adsorption techniques. The various variables studied include agitation time, pH, and particle size. The optimal time, pH, and particle size was found to be...

This article was inspired by a field reconnaissance survey of outcrops along the Nembe-Brass axis of the petroliferous Niger Delta. It reviews various tradeoffs of the impact of upstream petroleum (seismic and production) operations on the mangrove ecosystems in that region, the largest in Sub-Saharan Africa. Mangroves and intertidal shores are con...

This article was inspired by a field reconnaissance survey of outcrops along the Nembe-Brass axis of the petroliferous Niger Delta. It reviews various tradeoffs of the impact of upstream petroleum (seismic and production) operations on the mangrove ecosystems in that region, the largest in Sub-Saharan Africa. Mangroves and intertidal shores are con...

Twelve combustible mixtures of condensate/gasoline were evaluated with the aim to delimit the extent at which the adulteration of premium motor spirit (PMS) with condensate samples becomes hazardous to spark-ignited gasoline engines. Results of the quality-assurance tests (low RON (research octane number) rating and low volatility corroborated by <...

The rate of intestinal absorption of carbamazepine (CBZ) was studied using the Sartorius Absorption Simulator. Diffusion rate constants (kd) of 7.43 (±0.32) x 10-3 cm.min-1 and 7.44 (±0.2) x 10-3cm.min-1 were obtained using Sörensen phosphate buffer pH 7.5 and the same buffer containing 0.4% BSA respectively as simulated plasma. These kd values wer...

In this study, the use of orange mesocarp residue biomass (modified and unmodified) as a cost-effective and environmentally safe technique to remove Mg 2+ , Zn 2+ , Cu 2+ , Pb 2+ from aqueous solution was investigated. The results showed that unmodified orange mesocarp residue bound 56% of Mg 2+ , 81% of Zn 2+ , 71% of Cu 2+ , 73% of Pb 2+ , and 85...

Static tests were employed to assess the acute toxicity of the water-soluble fraction (WSF) of spent automotive lubricating oil (of mixed SAE grades) on Clarias gariepinus, a freshwater fish commonly cultured in Nigeria. Median lethal concentrations (LC50) of the WSF were found to decrease as a function of exposure time from 690+/-21 (after 24 h) t...

Possible alterations in the distribution and composition of total petroleum hydrocarbon (TPH), polycyclic aromatic hydrocarbons (PAHs), and benzene, toluene, ethyl benzene, and xylene isomers (BTEX) in the released oil at Idu-Ekpeye in Niger Delta (Nigeria) were studied within two seasonal variations of two months and six months, with a view to ass...