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Articles by C.A. Kumolu-Johnson
Total Records ( 9 ) for C.A. Kumolu-Johnson
  C.A. Kumolu-Johnson , P.E. Ndimele , O.A. Ayorinde and T.I. Ojikutu
  The antioxidative and anti-fungal effects of ginger oil on smoked Chrysichthys nigrodigitatus, Clarias gariepinus and Oreochromis niloticus were examined during five week storage at room temperature 25-30°C. The ginger oil was extracted from fresh ginger through hydro-distillation. The fish samples were gutted washed thoroughly and each fish species were divided into three groups. Two groups were spiced with 1.0 and 1.5 mL of ginger oil/kg of fish, respectively before they were smoke dried for 2 h. The third group acts as the control which was not spiced with ginger oil. Chemical and microbiological analyses were performed to investigate quality changes and to determine the shelf stability of the products. The lowest TBA (14.64 mg MDA kg-1) and peroxide (3.91 mEq kg-1) values were recorded in Oreochromis niloticus samples treated with 1.5 mL ginger oil/kg of fish at week 1, while the highest TBA (30.48 mg MDA kg-1) and PV (18.76 mEq kg-1) occurred in the Clarias gariepinus control at week 5. The result also revealed that samples treated with ginger oil had lower mould count than the control but there was no significant different (p≥0.05), when compared to the control after 5 weeks of storage.
  C.A. Kumolu-Johnson and P.E. Ndimele
  Ginger is a rhizome with an established medicinal value. This study seeks to explore its anti-oxidative and anti-fungal properties when added to fish prior to smoking. An experiment was conducted to determine the effectiveness of ginger (Zingiber officinale) spice mixture on the shelf-life of hot-smoked Clarias gariepinus at different concentrations {0 g of ginger kg-1 of fish (control), 10 g of ginger kg-1 of fish, 20 g of ginger kg-1 of fish and 30 g of ginger kg-1 of fish}. Retardation in lipid oxidation, microbial proliferation and organoleptic qualities were used to assess the efficacy of ginger as an anti-oxidant and anti-fungi in hot-smoked catfish. The fish were divided into four batches and coated with appropriate quantities of ginger paste to give concentrations of 0 g of ginger kg-1 fish, 10 g of ginger kg-1 fish, 20 g of ginger kg-1 fish and 30 g of ginger kg-1 fish. They were then smoked for 8 h, cooled and stored in ambient temperature (25-30°C) for 21 days. Chemical, microbial and sensory evaluation studies were carried out on them. The anti-oxidative activity of ginger was evident from lower Thio Barbituric Acid (TBA) and peroxide values of treated samples relative to untreated (control) samples. The lowest TBA (2.88±0.35) and peroxide (5.87±1.48) values were recorded in 30 g of ginger kg-1 of fish while the highest TBA (4.08±0.51) and peroxide (13.38±1.97) occurred in the control. The results also showed that samples treated with ginger paste had lower microbial load than the control. Ginger has anti-oxidative and anti-fungal properties which can extend the shelf-life of hot-smoked Clarias gariepinus.
  P.E. Ndimele and C.A. Kumolu-Johnson
  Racial characterisation of fish species is important for taxonomic classification. The physico-chemical parameters of Ologe, Badagry and Epe Lagoons, Lagos, Nigeria were investigated and the morphometric characters of Cynothrissa mento from the three lagoons were compared to assess the possibility of this fish species from the three lagoons belonging to the same sub-population. The study was conducted between May, 2009 and April, 2010 and monthly sampling of fish and water was done in each sampling site. 9 physico-chemical parameters and 7 morphometric characters were assessed. A total of 386 specimens (Ologe 106, Badagry 174 and Epe 106) of C. mento were collected from the landings of the local fisher folks from the sampling sites. There was no significant difference (p>0.05) in all the physico-chemical parameters measured among the sampling sites except Biochemical Oxygen Demand (BOD). Coefficient of difference revealed that the C. mento from the three lagoons are uniform in all the morphometric parameters examined which means that the specimens from the three sampling sites belong to the same sub-population. Three morphometric characters (body depth, head length and head depth) with high correlations demonstrated isometric growth, that is, they were best described by simple linear regressions.
  C.A. Kumolu-Johnson and P.E. Ndimele
  Fish is an important source of animal protein especially in African countries, where the combine forces of high cost, disease, low genetic potentials of indigenous species among other factors have raised the cost of livestock almost beyond the reach of the low income groups. Fish becomes the readily accessible source of animal protein but this alternative is also threatened by poor post-harvest techniques in African countries, which have resulted in massive losses. The losses can be physical, economical or nutritional. It is important to develop effective post-harvest technology to reduce the widening gap between fish supply and demand, which have been increasing because of poor post-harvest techniques.
  C.A. Kumolu-Johnson , P.E. Ndimele and F.I. Olasehinde
  Clarias gariepinus is a fish that is of high demand in Nigeria. However, a lot of the output from wild and aquaculture deteriorate in quality because of improper preservation methods. This study investigated the effects of fresh garlic (Allium sativum) on lipid oxidation and microbial growth of hot-smoked catfish (Clarias gariepinus). Three garlic concentrations and control (0 (control), 10, 30 and 50 g garlic kg-1 fish) were prepared, hot-smoked and stored for 28 days at ambient temperature of 20-26°C. During the storage period, the samples were subjected to weekly chemical and microbial analyses. The highest Thiobarbituric acid (TBA) (4.32±0.39 mg malonaldehyde kg-1 sample), peroxide (12.31±2.06 milliequivalent peroxide kg-1 of sample) and microbial load (12.03±0.56 Log10 CFU g-1 fish) were recorded in the control while the lowest peroxide (6.91±1.08) and microbial count (11.15±0.43 Log10 CFU g-1 fish) occurred in sample with 50 g garlic kg-1 fish. However, the lowest TBA (3.06±0.26 mg malonaldehyde kg-1 sample) was observed in sample containing 30 g garlic kg-1 fish. The results of analyses suggest that fresh garlic possesses antioxidant and antimicrobial properties, which can extend the shelf life of Clarias gariepinus.
  P.E. Ndimele , C.A. Kumolu-Johnson and M.A. Anetekhai
  Water hyacinth (Eichhornia crassipes) which have been described as the most troublesome weed in the world have been linked to several problems like obstruction to water transportation, micro-habitat for disease vectors, obstruction to fishing and reduction in biodiversity. However, recent studies have also shown that this macrophyte can be used for the production of paper, biogas, fertilizer, fish feed and in the clean-up of polluted environment (phytoremediation). It becomes important to fully harness the potentials of this aquatic macrophyte, which could change its status from a weed to an income-generating plant.
  C.A. Kumolu-Johnson and P.E. Ndimele
  This study examined some limnological properties of Ologe Lagoon and the levels of six heavy metals (Cu, Zn, Cd, Pb, Fe and Cr) were also assessed in water, sediment and a commercially important fish, Oreochromis niloticus from the lagoon. The study lasted between July, 2010 and April, 2011 spanning both dry and wet season. Some of the physicochemical parameters (temperature, pH, salinity, dissolved oxygen and alkalinity) did not show significant (p>0.05) monthly variation. However, others (turbidity, total hardness, conductivity, total dissolved solids, total suspended solids, chemical oxygen demand and biological oxygen demand) showed significant (p<0.05) monthly variation. All the water quality variables investigated in this study did not show seasonal variation except turbidity, chemical oxygen demand and biological oxygen demand. The concentrations of five of the heavy metals (Cu, Zn, Cd, Pb and Fe) showed significant monthly variation in water and sediment. The range of concentrations of Cu, Zn, Cd, Pb and Fe in this study is 26.68±2.65-44.79±6.11, 29.41±2.52-94.40±12.08, 4.67±1.45-16.48±1.18, 6.43±1.03-21.60±2.08 and 60±15-290±32 μg L-1, respectively. The concentrations of Zn and Fe in Oreochromis niloticus showed significant monthly variation and their range of values are Zn, 0.19±0.15-1.69±0.33 mg kg-1 and Fe, 5.08±1.50-12.56±3.12 mg kg-1. This study has shown that these heavy metals are present in Ologe Lagoon, though, their levels are still within the tolerable limits.
  P.E. Ndimele and C.A. Kumolu-Johnson
  Some physicochemical parameters and heavy metal content of water, sediment and Cynothrissa mento from Badagry Creek were studied for eight months (July, 2010-October, 2010; January, 2011-April, 2011) spanning wet and dry seasons. The heavy metals investigated are Cu, Zn, Cd, Pb, Fe and Cr while the physicochemical parameters are temperature, pH, conductivity, Total Dissolved Solids (TDS), Total Suspended Solids (TSS), salinity, turbidity, Dissolved Oxygen (DO), Biological Oxygen Demand (BOD), Chemical Oxygen Demand (COD), alkalinity and hardness. All the physicochemical parameters except temperature and dissolved oxygen exhibited significant (p<0.05) monthly variation. However, six of the physicochemical parameters (total suspended solids, turbidity, biological oxygen demand, chemical oxygen demand, alkalinity and hardness) representing 50% showed significant (p<0.05) seasonal variation. All the heavy metals studied except Cr showed significant (p<0.05) monthly variation in at least one of the environmental compartments (water column, sediment and Cynothrissa mento). The range of concentrations of the six heavy metals in Cynothrissa mento are Cu (0.06±0.02-0.91±0.19 mg kg-1), Zn (0.19±0.04-1.69±0.33 mg kg-1), Cd (0.01±0.01-0.05±0.02 mg kg-1), Pb (0.01±0.01-0.12±0.01 mg kg-1), Fe (4.33±0.43-16.88±1.32 mg kg-1) and Cr (0.01±0.01-0.05±0.02 mg kg-1). Most of the values of the physicochemical parameters and heavy metals were within the limits recommended by World Health Organisation, Nigeria’s Federal Environmental Protection Agency and United States Environmental Protection Agency except alkalinity, hardness and Fe in sediment. This study shows that the water quality variables of Badagry Creek can sustain fish and the heavy metal content is not harmful to fish and man yet.
  P.E. Ndimele , C.A. Kumolu-Johnson , K.S. Chukwuka , C.C. Ndimele , O.A. Ayorinde and O.R. Adaramoye
  This study was carried out to investigate the ability of water hyacinth (Eichhornia crassipes (Mart.) Solms.) to absorb and translocate iron (Fe) and copper (Cu). The study was conducted with three concentration gradients of Fe and Cu at 10, 15, 20 mg L-1 and control (no metal). The whole set-up was carried out in triplicate and the experiment lasted for 12 weeks. The results showed that iron (Fe) had the highest accumulation value in the root (11.22±6.69 mg kg-1), while copper (Cu) had the highest value in the leaf (3.80±0.12 mg kg-1) both occurred at treatment spiked at 20 mg metal/L of water. Statistical analysis showed that there was significant difference (p<0.05) in metal accumulation among treatments. The Translocation Factor (TF) values for Fe ranged from 0.49±0.57 to 0.68±0.27 in leaf and 0.64±0.17 to 0.77±0.18 in the stem while the TF values for Cu ranged from 0.78±0.08 to 1.12±0.12 in leaf and 0.72±0.32 to 1.09±0.19 in the stem. This reveals that Cu had better translocation capability than Fe. Highest values of Bioconcentration factor (BCF) for Fe and Cu were 2.32±0.65 at 20 mg L-1 and 0.72±0.01 at 15 mg L-1 obtained in the root and leaf respectively, indicating that the accumulation potential of Fe by water hyacinth is higher than Cu. So, according to the accumulation capabilities of the investigated plant (Eichhornia crassipes), this study showed that the plant was found to be a promising candidate for phytoremediation and adequate for bio-monitoring programmes for contaminated water.
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