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Potential health lmplications of the consumption of thermally-oxidized cooking oils – a review

100%
Falade A. O., Oboh G., Okoh A. I.
Polish Journal of Food and Nutrition Sciences
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2017
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tom 67
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nr 2
Cooking oils are an integral part of a human diet as they are used in almost all types of culinary practices. They serve as sources of lipids with a signifi cant nutritive value and health benefi ts which can be attributed to their fatty acid compositions and biological antioxidants. However, cooking oils are usually subjected to thermal oxidation which occurs when fresh cooking oil is heated at high temperatures during various food preparations. Repeated use of cooking oils in the commercial food industry is also common to maximize profit. Thermal oxidation of edible oils had since attracted great attention of nutritionist and researchers given the deteriorative effect such as generation of very cytotoxic compounds, loss of carotenoid, phenolics and vitamins thus reducing the overall antioxidant properties of the oils. Furthermore, several in vivo studies had suggested that consumption of thermally-oxidized cooking oils might not be healthy as it might negatively influence the lipid profile (increased low density lipoprotein (LDL), decreased high density lipoprotein (HDL) and elevated cholesterol level), haematological system (alteration in concentration of heamoglobin (Hb), packed cell volume (PCV), white blood cell (WBC) count, neutrophil and lymphocyte counts), kidney function, and induce lipid peroxidation and oxidative stress which have been associated with the pathogenesis of various degenerative diseases. Therefore, thermal oxidation seems not to provide any health benefit, as it deteriorates cooking oils and the consumption of the oils may predispose consumers to various disease conditions that may ensue from free radical generation, thereby having deleterious effect on human health.
2

Physicochemical properties of wastewater in three typical South African sewage works

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Agoro M. A., Okoh O. O., Adefisoye M. A., Okoh A. I.
Polish Journal of Environmental Studies
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2018
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tom 27
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nr 2
The physicochemical qualities of the effluent samples of three municipal sewage treatment plants in the Eastern Cape of South Africa were evaluated from September 2015 to February 2016 using standard methods. The physicochemical parameters assessed include pH, temperature, total dissolved solid (TDS), turbidity, chemical oxygen demand (COD), alkalinity, dissolved oxygen (DO), free chlorine, chloride, sulphate, phosphate, ammonium, and electrical conductivity (EC). The results of the evaluation were as follows: temperature (19-36ºC), EC (60-1,095 mS/m), alkalinity (2.6-20.9 mg/L), nitrate (0.24-26.5 mg/L), nitrite (0.01-90 mg/L), phosphate (0.02-5.12 mg/L), ammonium (0.06-112 mg/L), sulphate (3-72 mg/L), chloride (3.25-224 mg/L), COD (17-394 mg/L), and turbidity (1.96-715 NTU). Free chlorine concentrations and DO were within the recommended limits for most of the sampling period and ranged between 0.17-0.48 mg/L and 0.19-21.9 mg/L, respectively. Also, the pH, phosphate, sulphate, and free chlorine concentrations were within acceptable limits, while EC, temperature, TDS, turbidity, COD, chloride, ammonium, nitrate, and nitrite did not conform to recommended limits. We conclude that these municipal sewage plants are sources of pollution to their respective receiving watersheds and threats to public and environmental health.
3

Organochlorine pesticides in selected sewage sludge in South Africa : assessment and method validation

100%
Ademoyegun O. T., Okoh O. O., Okoh A. I.
Polish Journal of Environmental Studies
|
2020
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tom 29
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nr 2
4

Molecular detection of metallo-beta-lactamase and putative virulence genes in environmental isolates of Pseudomonas species

100%
Igbinosa I. H., Igbinosa E. O., Okoh A. I.
Polish Journal of Environmental Studies
|
2014
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tom 23
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nr 6
The aim of this study was to investigate the presence of metallo-β-lactamase (Imp-1, Vim-1, Vim-2) -resistant genes and putative virulence genes (ExoS, Apr, LasB, PhzM) in some environmental isolates of Pseudomonas species recovered from freshwater, wastewater, cultivated soil, plant root, and plant rhizosphere samples. Polymerase chain reaction (PCR) was employed to evaluate the presence and established metallo-β- lactamase and virulence genes using specific primer sets. About 6.7% of the Pseudomonas isolates from wastewater treatment plant were found to harbour the cytotoxin gene, while 20%, 20.6%, and 6.7% of the isolates were positive for alkaline protease, phenazine and Vim-2 genes, respectively. For the Pseudomonas species isolated from plant rhizosphere, 14.3% were positive for phenazine gene, while 10.7% were positive for Vim-2 gene. Dissemination of the target genes were in the following pattern: all isolates that harboured ExoS, Apr, and Vim-2 genes from wastewater sample were found to be Pseudomonas putida, while phenazine gene was found in 75% of Pseudomonas putida isolates and 25% of other Pseudomonas species. All plant rhizosphere isolates harbouring phenazine and Vim-2 genes were observed to be Pseudomonas putida species. The incidence of Vim-2 and virulence genes in some environmental isolates of Pseudomonas species suggest that these isolates are reservoirs of metallo-β-lactamase-resistant genes and are potential pathogens that may be of serious public health significance.
5

Studies on bioflocculant production by Bacillus sp. AEMREG7

88%
Okaiyeto K., Nwodo U. U., Okoli A. S., Mabinya L. V., Okoh A. I.
Polish Journal of Environmental Studies
|
2016
|
tom 25
|
nr 1
The detrimental effects of inorganic and organic synthetic flocculants on humans and their recalcitrance in the environment have necessitated the search for safe, eco-friendly alternatives, including microbial flocculants. A bioflocculant-producing bacteria was isolated from sediment samples of Algoa Bay in the Eastern Cape Province of South Africa. The bacteria was identified through partial 16S ribosomal ribonucleic acids (rRNA), nucleotide sequencing, and BLAST analysis of the gene sequence that showed the bacteria to have 98% similarity to Bacillus algicola strain QD43 and deposited in GenBank as Bacillus sp. AEMREG7 with accession number KF933697.1. The effect of culture conditions on MBF-UFH production revealed optimally at inoculum size of 3% (v/v), glucose, a mixed nitrogen source [NH4 (SO4)2 + urea + yeast extract], and pH 6 for inoculums size, carbon and nitrogen sources, and initial medium pH for the fermentation process, respectively. The spent culture broth-rich bioflocculant attained the highest flocculating activity of 88.5% after 72 h of fermentation during the exponential phase of bacterial growth. It showed a high flocculating activity for kaolin clay suspension over a wide pH range of 4-10 with maximum flocculating activity observed at pH 6; and also retained 70.5% flocculating activity after heating at 100ºC for 60 min. These findings suggest that MBF-UFH has a great potential to substitute hazardous chemical flocculants commonly used in water treatment, hence reducing deformities among individuals in society.
6

Endoglucanase and xylanase production by Chryseobacterium species isolated from decaying biomass

88%
Nkohla A., Okaiyeto K., Nwodo U. U., Mabinya L. Y., Okoh A. I.
Polish Journal of Environmental Studies
|
2017
|
tom 26
|
nr 6
Lignocellulosic materials are potential sources of isolating bacteria that can be used to produce important value-added products such as cellulase (endoglucanase) and xylanase in industry. Based on the above-mentioned premise, this study aimed to assess endoglucanase and xylanase-degrading potentials of a bacterial isolate from decaying sawdust samples collected from a wood factory at Melani village, Nkonkobe Municipality of Eastern Cape Province, South Africa. The bacteria showed high activity for endoglucanase and xylanase when grown on carboxymethyl cellulose (CMC) and birch wood xylan as sole carbon sources, respectively. The bacterial isolate was identified through 16S rDNA sequencing and the gene sequence was found to have 98% similarity with that of Chryseobacterium taichungense. The sequence was deposited in the GenBank as Chrysobacterium taichungense SAMRC-UFH2 with accession number KU171370. Optimum culture conditions for endoglucanase and xylanase production included: pH 6, incubation temperature (25ºC), and agitation rates of 50 rpm and 150 rpm for endoglucanase and xylanase, respectively. The high enzyme activities exhibited by this bacterial strain portend it as a potentially relevant candidate as a producer for value-added products of biotechnological importance.
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