Scientific Research Journal, Volume X, Issue III, March 2022 Edition

Scientific Research Journal

Scirj Volume X, Issue III, March 2022 Edition
ISSN: 2201-2796

Publication starts: 25th March 2022
Full Paper available from: 25th March 2022

Investigation of Corrosion inhibition potentials of Landolphia dulcis Extract on Mild Steel in Acidic Medium
Precious O. Emole, Kelechi E Onwuka, Pauline U Chris-Okafor

Abstract: The effectiveness of Landolphia dulcis extract; an eco-friendly corrosion inhibitor on mild steel in acidic medium was studied using gravimetric (weight loss) and gasometric (hydrogen evolution) techniques considering the kinetic and thermodynamic parameters necessary in corrosion test. The experimental results obtained revealed excellent inhibition properties for the extract even at higher temperatures (333 & 353 K) with the highest inhibition efficiency of 84.09% which is attributed to the presence of heteroatoms seen in the FT-IR spectrum. The calculated values of activation energy (Ea) were all positive which increased with increase in the concentration of the extract indicating a higher energy barrier required for further deterioration of the metal and the average activation energy of 27.17 kJ/mol denotes physical adsorption mechanism. Fairly linear rate constants deduced that the process is of first order reaction. Also, the feasibility of reaction is evidenced by negative ΔGads values. The experimental data best fitted Langmuir and Temkin isotherm models depicting a monolayer formation as well as strong interaction between the metal substrate and the inhibitor molecules.

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Serodiagnosis of human cysticercosis for epidemiological studies in low-income countries is the ELISA screening strategy accurate
Kouadio Thierry-Borel N’DRI, Zara RAZAFIARIMANGA, Man-Koumba SOUMAHORO, Jihen MELKI, Offianan André TOURE, Jacques BELLALOU , Allico Joseph DJAMAN, Ronan JAMBOU

Abstract: Background: Serodiagnosis of cysticercosis uses two serological tests, ELISA and Western blot, which are carried on sequentially. Only the samples positive in Elisa are confirmed with Western blot. The objective of this study was to assess the agreement between the ELISA and Western blot to evaluate false negative generate by ELISA alone. Methods: This is a retrospective study conducted on samples randomly drawn at random from a serum bank constituted during two cross-sectional surveys carried out in the departments of Dabou and Agboville, in the south of Cote dIvoire. These two sero-epidemiological studies were conducted on randomly selected asymptomatic subjects. The sera selected for this ancillary study were all tested using both native antigen Elisa and western blot methods. Western blot (EITB) was used as reference test. Sensitivity, specificity, false positive and false negative rates of the Elisa test were determined against EITB results. Results: A total of 594 sera (297 positives / 297 negatives in ELISA), were tested by Western blot. The sensitivity and specificity of the ELISA were 82.6% and 79.5%, respectively. The false negative and false positive rates of ELISA were 16.5% and 21.6%, respectively. A strong agreement was observed between these two tests with a Cohens Kappa value equal to 0.62. Conclusion: These data reveal that the Elisa test alone is not sufficient for the serodiagnosis of cysticercosis. When used for diagnosis in symptomatic patient, ELISA alone is not sufficient to avoid the diagnostic. Elisa-negative patient who presents a critical clinical picture must be tested by Western blot.

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