Studies suggest that extracts from plant materials could play protective roles against various disorders associated with the interplay between oxidative response and inflammatory disorders. The aim of this study was to investigate the... more
Studies suggest that extracts from plant materials could play protective roles against various disorders associated with the interplay between oxidative response and inflammatory disorders. The aim of this study was to investigate the potential antioxidant and anti-inflammatory properties, and phytochemical analyses of methanol extract of ripe and unripe peels of Ananas comosus (L.) Merr. The antioxidant properties were investigated through the analyses of ferric ion reducing antioxidant capacities, ascorbic acid equivalent antioxidant capacities, and nitric oxide scavenging capacities of the extracts. The anti-inflammatory potentials of the extracts were assessed through albumin denaturation inhibition and proteinase inhibition assays. Further investigation was carried out on the phytochemical composition of the extracts. There was no significant difference in the antioxidant potentials of the extracts assessed through the reduction of ferric ion. However, the ascorbic acid equival...
Kinetic measurements were performed for the alkaline hydrolysis of brilliant green — a triphenylmethane dye used as a model compound for probing micellar rate effects. This reaction was studied both in the presence of... more
Kinetic measurements were performed for the alkaline hydrolysis of brilliant green — a triphenylmethane dye used as a model compound for probing micellar rate effects. This reaction was studied both in the presence of tetradecyltrimethylammonium bromide (TTAB) and tetradecyltriphenylphosphonium bromide (TTPPBr) and also in binary mixtures of these surfactants at different mole fractions of each. All rate surfactant profiles were
Periodate oxidation of bis-(1,10-phenanthro-line)-dicyano iron(II) ([Fe(C12H8N2)(CN )2]), known also as ferrocyphen, in SDS surfactant was studied in aqueous and acidic medium. The redox reaction is catalysed 124-fold in 1.220 9 10-4 mol... more
Periodate oxidation of bis-(1,10-phenanthro-line)-dicyano iron(II) ([Fe(C12H8N2)(CN )2]), known also as ferrocyphen, in SDS surfactant was studied in aqueous and acidic medium. The redox reaction is catalysed 124-fold in 1.220 9 10-4 mol dm-3 H2SO4 acid. ...
A kinetic study of the leaching of iron and manganese from powdered tantalite-columbite ore by Hydrochloric Acid (HCl) and Sulphuric Acid (H 2 SO 4 ) solutions has been carried out. The effects of (a) particle size ranging from 63 to 250... more
A kinetic study of the leaching of iron and manganese from powdered tantalite-columbite ore by Hydrochloric Acid (HCl) and Sulphuric Acid (H 2 SO 4 ) solutions has been carried out. The effects of (a) particle size ranging from 63 to 250 mum (b) stirring speed ranging from 180 ...
Crude oil and produced water samples obtained from ten wells in an offshore field, Niger Delta, were analyzed, in order to determine the occurrence of naphthenates deposition in the field. Total acid number (TAN) and °API of the crude oil... more
Crude oil and produced water samples obtained from ten wells in an offshore field, Niger Delta, were analyzed, in order to determine the occurrence of naphthenates deposition in the field. Total acid number (TAN) and °API of the crude oil samples, pH and metal ions concentrations of the produced water samples were determined. The results revealed that TAN values ranged from 0.47 to 1.01 mgKOH/g with pH of 6.9–8.9, which were above established threshold. The metal ions concentrations especially for Ca++ and Na+ were relatively high. These imply a high possibility of metal-naphthenate precipitation in the oil production facilities in this field.
Citrus sinensis seed and peel oils were extracted by solvent extraction using n-hexane, after air drying and grinding. Soaps were formed by saponification methods. Fatty acid composition of the oil samples were analyzed using Gas... more
Citrus sinensis seed and peel oils were extracted by solvent extraction using n-hexane, after air drying and grinding. Soaps were formed by saponification methods. Fatty acid composition of the oil samples were analyzed using Gas Chromatograph-Flame Ionization Detector (GC-FID). Physicochemical properties of the oils and soaps were determined following standard methods. Antimicrobial activities were assessed by the agar disc and hole-in plate methods. The seed and peel oil yield were 38 and 30%, respectively and the colors were golden yellow and brownish-yellow, respectively. Physicochemical properties of the oil samples determined were: refractive index (RI): 1.46 and 1.47, smoke point: 140 and 149, flash point: 150 and 160, pH: 5.2 and 4.2, acid value (AV): 23.6 and 25.1 mgKOH/g, free fatty acid (FFA): 11.86% as oleic acid and 12.61% as oleic acid, iodine value (IV): 78.83I 2 g/100 g and 120.10I 2 g/100 g, peroxide value (PV): 18.00 mgKOH/g and 5.40 mgKOH/g, saponification value (SV): 222.58 and 41.25 mgKOH/g, ester value (EV): 178.24 and 28.96 mgKOH/g for the seed and the peel oil respectively. Inhibitory antimicrobial activities were assessed for the two oils and the soap produced at concentrations of 40 mg/ml and below, against most of the gram positive and gram negative bacteria as well as the two candida strains, screened as compared with streptomycin (1 mg/L) and acriflavin (6.3 mg/ml) standard controls. Seed oil demonstrated better activities than the peel oil with growth inhibitions obtained against Staphylococcus aureus and Candida albicans at a concentration as low as 2.5 mg/ml. This study has shown that the results obtained for the physicochemical and antimicrobial properties of the oils provide a synergy for the oil samples as suitable raw materials for the cosmetic and pharmaceutical industries.
