Issa TAPSOBA | Ouagadougou University (original) (raw)
Papers by Issa TAPSOBA
International research journal of pharmacy, Aug 4, 2023
ECS Meeting Abstracts, 2006
not Available.
Electrochimica Acta, 2007
The electrochemical behaviors of poly(ferrocenylsilane) (PFS) films in organic solutions were inv... more The electrochemical behaviors of poly(ferrocenylsilane) (PFS) films in organic solutions were investigated by means of cyclic voltammetry (CV) and electrochemical quartz crystals microbalance (EQCM). The influences of solvent on the electrochemical behavior of the films were discussed. In “good” solvents, the supporting electrolytes dissociated completely, the films were solvent-swollen moderately which provided a favorable condition for the electrolyte ions penetrating
International Journal of Analytical Chemistry, 2022
Nickel(II) tetrasulfonated phthalocyanine (p-NiTSPc)-modified carbon fiber microelectrode (CFME) ... more Nickel(II) tetrasulfonated phthalocyanine (p-NiTSPc)-modified carbon fiber microelectrode (CFME) was used for the first time to investigate the electrochemical quantification of diuron in an agrochemical formulation. The surface morphology and elementary analysis of unmodified carbon fiber microelectrode (CFME) and p-NiTSPc-CFME were performed using atomic force microscopy (AFM) and energy dispersive X-ray spectroscopy (EDX), respectively. Cyclic voltammetry (CV) was used to investigate the electrochemical behaviour of diuron, while square wave voltammetry (SWV) was used for quantitative analysis of diuron. Upon variation of some key analytical parameters, a calibration curve was plotted in the concentration range from 21.450 to 150.150 μM, leading to a detection limit (DL) of 8.030 μM mg/L (3.3σ/m) and a limit of quantification (LQ) of 20.647 μM mg/L. The fabricated p-NiTSPc-CFME was successfully applied for quality control in a commercialized formulation of diuron. The standard ad...
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Natural Products: An Indian Journal, 2017
In this study, the whole plant of Euphorbia hirta. L was investigated for phytochemical and antif... more In this study, the whole plant of Euphorbia hirta. L was investigated for phytochemical and antifungal properties. Hydroethanolic extract of E. hirta has been fractioned with different organic solvents and were analysed for chemical screening, antioxidant and antifungal activities against Fusarium moniliforme and Phoma sorghina. The results showed that E. hirta L contains tannins, flavonoids, alkaloids and terpenoids. Ethyl acetate and butanol fractions of E. hirta L present high contents of phenolic compounds with respectively 3.675 and 3.588 mg gallic acid equivalent per gram of extract. The antioxidant activities evaluated by FRAP showed that these two fractions contain 4.147 mg and 3.977 mg Trolox equivalent per gram of extract, respectively. The antifungal activity investigated on Fusarium moniliforme and Phoma sorghina shows that 5 mg/ml of these extracts inhibit the mycelium growth of these fungi at 58.33% and 44.67% respectively and demonstrate that these extracts could be u...
Microchemical Journal, 2021
Abstract The doping of carbon dots (CDs) with non-metallic elements has been a strategy to improv... more Abstract The doping of carbon dots (CDs) with non-metallic elements has been a strategy to improve their optical properties and application fields. In the present work, nitrogen and phosphorus-doped CDs (N, P-CDs) were prepared through one-pot hydrothermal synthesis using phytic acid (PA) and L-arginine (Arg) as precursors. The synthesized N, P-CDs were characterized using transmission electron microscopy, FTIR, Raman, UV-vis, and fluorescence spectroscopies. The N, P-CDs exhibited green fluorescence (λem = 515 nm) that can be quenched sensitively and selectively in the presence of Cr(VI), combining static quenching, electron transfer, and an inner filter effect. Consequently, a new fluorescence sensing method applied to Cr(VI) determination was developed using the presently synthesized fluorescent CDs. Under optimized conditions, a linear range from 0.05 to 3 µM in Cr(VI)) was obtained, with a limit of detection of 26 nM. Additionally, the N, P-CDs were selective toward Cr(VI) in the presence of Cr(III) and twenty other species, indicating its potential use to monitor Cr(VI) in environmental samples. Then, Cr(VI) was successfully determined, with recoveries from 85 to 107 % in water and soil samples. The method, combining high sensitivity and selectivity, is easy to implement and promotes the use and valorization of eco-friendly materials.
Journal of Applied Electrochemistry, 2019
Arabic Gum (AG) modified carbon paste electrode (CPE) was developed for the first time and used f... more Arabic Gum (AG) modified carbon paste electrode (CPE) was developed for the first time and used for sensitive detection of 4-aminophenol (PAP) in real samples. Energy dispersive X-ray spectroscopy and scanning electron microscopy were respectively used for the elemental and morphological characterization of unmodified and modified CPEs. Electrochemical studies of PAP using the AG immobilized on a CPE were performed with cyclic voltammetry and square wave voltammetry (SWV). The AG-CPE showed an enhanced electrochemical response, with sensitivity 1.6-fold greater than the signal obtained at the unmodified CPE in SWV. With AG-CPE, the linear dynamic range of PAP was found within the concentration range of 2.7-100 µM with a detection limit of 0.38 µM (S/B = 3), and a sensitivity of 1.2 µA L mol − 1. Using the proposed method, PAP was successfully detected in tap and dam water samples with standard addition method, suggesting that this method can be applied to determine this pollutant in wastewaters.
Comptes Rendus Chimie, 2016
Abstract Flavonoids due to their various interesting biological properties such as antifungal act... more Abstract Flavonoids due to their various interesting biological properties such as antifungal activity were investigated in Mentha piperita leaves. The butanolic fraction obtained from the hydro-alcoholic crude extract of M. piperita is rich in flavonoids; it reduced in vitro the mycelium growth of Phoma sorghina and Fusarium moniliforme around 72% and 55%, respectively, when used at a concentration of 5 mg/ml. In addition, the chemical conversion of the flavonoids in the butanolic fraction into their oxime derivatives increased the antifungal activity since the percentage of inhibition increased to 84% and 65% against P. sorghina and F. moniliforme , respectively, at 5 mg/ml. Butanolic fraction and oxime inhibition effects on spore germination of the two fungi were also observed. These results suggest that, M. piperita flavonoids could be used as botanical fungicides to protect cereals against infection from P. sorghina and F. moniliforme.
![Research paper thumbnail of Electrochemical reduction of N-thioamidoimidates: application to the synthesis of thiazolo[5,4-d]thiazoles](https://attachments.academia-assets.com/89519986/thumbnails/1.jpg)
](Journal of Electroanalytical Chemistry, 2004
The reduction of N-thioamidoimidates (1) has been examined in aprotic media at a mercury electrod... more The reduction of N-thioamidoimidates (1) has been examined in aprotic media at a mercury electrode. As shown by cyclic voltammetry at fast scan rates and controlled potential electrolysis, an overall irreversible one electron transfer is followed by a rapid second order chemical reaction leading to a dimer which involves to thiazolo[5,4-d]thiazole by intramolecular cyclization.
European Journal of Mass Spectrometry, 2012
Differentiation of flavonoid congeners remains a challenging analytical problem and confirming th... more Differentiation of flavonoid congeners remains a challenging analytical problem and confirming the structures of the different isomers is difficult, even when they can be adequately separated from mixtures. In the present report, in order to overcome the limits of our recently proposed method that relies on the distinctive CID behaviors of [(flavonoid – H+) + Cu2+] complexes to obtain direct structural evidences, we decided to investigate the possibility of using Pb(II) complexation to generate significant differences upon CID. We selected five flavonoid diglycosides with targeted structural features to estimate the applicability of this methodology. Electrospray ionization from methanol—not acetonitrile—solutions was advantageously used for preparing the [(flavonoid diglycoside – H+) + Pb2+]+ complexes. Upon collisional activation, [(flavonoid diglycoside – H+) + Pb2+]+ ions mainly dissociate by glycosidic bond cleavage. Nevertheless, specific cross-ring cleavages are also induced ...
Electrochimica Acta, 2007
Electrochemical study of N-thioamidoimidates 1 is carried out in non-aqueous solvent at platinum ... more Electrochemical study of N-thioamidoimidates 1 is carried out in non-aqueous solvent at platinum electrodes by means of cyclic voltammetry at different scan rates. A mechanistic investigation shows that the oxidation of the NH bond of these substrates leads, during ...
Instrumentation et Interdisciplinarité, 2020
Les effluents industriels issus des activités textiles présentent une grande charge polluante dif... more Les effluents industriels issus des activités textiles présentent une grande charge polluante difficilement biodégradable et qui a des impacts non négligeables sur l’environnement et l’Homme. Leur décontamination par les procédés conventionnels biologiques ou physiques est souvent inefficace et nécessite par conséquent le recours à des procédés d’oxydation avancée dont l’électrocoagulation. Dans le présent travail, nous avons étudié l’élimination par électrocoagulation du bleu de méthylène, modèle de colorant synthétique textile, en utilisant des électrodes de fer et d’aluminium. L’étude des paramètres pouvant influencer l’élimination par électrocoagulation du bleu de méthylène tels que le pH, la durée de l’électrolyse, la densité de courant et la nature de l’anode a montré que les meilleurs traitements sont obtenus avec un effluent de pH égal à 7 pendant 4 heures d’électrolyse à une densité de courant de 3,75 A/cm2 en utilisant l’électrode de fer. Dans ces conditions, le pourcentag...
Plants, 2021
Acacia macrostachya is used in Burkina Faso folk medicine for the treatment of inflammation and c... more Acacia macrostachya is used in Burkina Faso folk medicine for the treatment of inflammation and cancer. The purpose of this study was to evaluate the antioxidant and cytotoxic effects of this plant. The cytotoxic effects of root (dichloromethane B1 and methanol B2) and stem (dichloromethane B3 and methanol B4) bark extracts of A. macrostachya were assessed on chronic K562 and acute U937 myeloid leukemia cancer cells using trypan blue, Hoechst, and MitoTracker Red staining methods. The antioxidant content of extracts was evaluated using DPPH (2,2-diphenyl-1-picryl-hydrazyl) and FRAP (ferric reducing antioxidant power) methods. The root bark extracts B1 and B2 of A. macrostachya demonstrated higher cytotoxicity with IC50 values in a low µg/mL range on both U937 and K562 cells, while the stem bark B4 extract selectively affected U937 cells. Overall, healthy proliferating peripheral blood mononuclear cells (pPBMCs) were not or barely impacted in the range of concentrations cytotoxic to ...
European Journal of Medical and Health Sciences, 2020
In this work, the anti-diabetic activity of three extracts of Acacia macrostachya was investigate... more In this work, the anti-diabetic activity of three extracts of Acacia macrostachya was investigated by following the inhibitory effect of these extracts on -glucosidase using the in vitro model. The antiradical activity of these extracts was also determined. Methanol extracts of root and stem barks showed a very significant inhibitory effect against the enzyme activity of -glucosidase with IC50 2.487 ± 0.441 µg/mL and 1.650 ± 0.229 µg/mL respectively. For antiradical activity, the same extracts presented the highest scavenging of the radical DPPH● with IC50 values of 9.307 ± 0.262 µg/mL and 5.242 ± 0.068 µg/mL respectively. With the cationic radical ABTS●+, IC50 varied from 45.049 ± 0.730 µg/mL for methanolic root barks extract to 14.136 ± 0.161 µg/mL for methanolic extract from stem barks. Thus, the methanol extracts of the root and stem barks of Acacia macrostachya possess compounds with very interesting anti-diabetic and antiradical properties and could justify its traditional use.
International research journal of pharmacy, Aug 4, 2023
ECS Meeting Abstracts, 2006
not Available.
Electrochimica Acta, 2007
The electrochemical behaviors of poly(ferrocenylsilane) (PFS) films in organic solutions were inv... more The electrochemical behaviors of poly(ferrocenylsilane) (PFS) films in organic solutions were investigated by means of cyclic voltammetry (CV) and electrochemical quartz crystals microbalance (EQCM). The influences of solvent on the electrochemical behavior of the films were discussed. In “good” solvents, the supporting electrolytes dissociated completely, the films were solvent-swollen moderately which provided a favorable condition for the electrolyte ions penetrating
International Journal of Analytical Chemistry, 2022
Nickel(II) tetrasulfonated phthalocyanine (p-NiTSPc)-modified carbon fiber microelectrode (CFME) ... more Nickel(II) tetrasulfonated phthalocyanine (p-NiTSPc)-modified carbon fiber microelectrode (CFME) was used for the first time to investigate the electrochemical quantification of diuron in an agrochemical formulation. The surface morphology and elementary analysis of unmodified carbon fiber microelectrode (CFME) and p-NiTSPc-CFME were performed using atomic force microscopy (AFM) and energy dispersive X-ray spectroscopy (EDX), respectively. Cyclic voltammetry (CV) was used to investigate the electrochemical behaviour of diuron, while square wave voltammetry (SWV) was used for quantitative analysis of diuron. Upon variation of some key analytical parameters, a calibration curve was plotted in the concentration range from 21.450 to 150.150 μM, leading to a detection limit (DL) of 8.030 μM mg/L (3.3σ/m) and a limit of quantification (LQ) of 20.647 μM mg/L. The fabricated p-NiTSPc-CFME was successfully applied for quality control in a commercialized formulation of diuron. The standard ad...
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Natural Products: An Indian Journal, 2017
In this study, the whole plant of Euphorbia hirta. L was investigated for phytochemical and antif... more In this study, the whole plant of Euphorbia hirta. L was investigated for phytochemical and antifungal properties. Hydroethanolic extract of E. hirta has been fractioned with different organic solvents and were analysed for chemical screening, antioxidant and antifungal activities against Fusarium moniliforme and Phoma sorghina. The results showed that E. hirta L contains tannins, flavonoids, alkaloids and terpenoids. Ethyl acetate and butanol fractions of E. hirta L present high contents of phenolic compounds with respectively 3.675 and 3.588 mg gallic acid equivalent per gram of extract. The antioxidant activities evaluated by FRAP showed that these two fractions contain 4.147 mg and 3.977 mg Trolox equivalent per gram of extract, respectively. The antifungal activity investigated on Fusarium moniliforme and Phoma sorghina shows that 5 mg/ml of these extracts inhibit the mycelium growth of these fungi at 58.33% and 44.67% respectively and demonstrate that these extracts could be u...
Microchemical Journal, 2021
Abstract The doping of carbon dots (CDs) with non-metallic elements has been a strategy to improv... more Abstract The doping of carbon dots (CDs) with non-metallic elements has been a strategy to improve their optical properties and application fields. In the present work, nitrogen and phosphorus-doped CDs (N, P-CDs) were prepared through one-pot hydrothermal synthesis using phytic acid (PA) and L-arginine (Arg) as precursors. The synthesized N, P-CDs were characterized using transmission electron microscopy, FTIR, Raman, UV-vis, and fluorescence spectroscopies. The N, P-CDs exhibited green fluorescence (λem = 515 nm) that can be quenched sensitively and selectively in the presence of Cr(VI), combining static quenching, electron transfer, and an inner filter effect. Consequently, a new fluorescence sensing method applied to Cr(VI) determination was developed using the presently synthesized fluorescent CDs. Under optimized conditions, a linear range from 0.05 to 3 µM in Cr(VI)) was obtained, with a limit of detection of 26 nM. Additionally, the N, P-CDs were selective toward Cr(VI) in the presence of Cr(III) and twenty other species, indicating its potential use to monitor Cr(VI) in environmental samples. Then, Cr(VI) was successfully determined, with recoveries from 85 to 107 % in water and soil samples. The method, combining high sensitivity and selectivity, is easy to implement and promotes the use and valorization of eco-friendly materials.
Journal of Applied Electrochemistry, 2019
Arabic Gum (AG) modified carbon paste electrode (CPE) was developed for the first time and used f... more Arabic Gum (AG) modified carbon paste electrode (CPE) was developed for the first time and used for sensitive detection of 4-aminophenol (PAP) in real samples. Energy dispersive X-ray spectroscopy and scanning electron microscopy were respectively used for the elemental and morphological characterization of unmodified and modified CPEs. Electrochemical studies of PAP using the AG immobilized on a CPE were performed with cyclic voltammetry and square wave voltammetry (SWV). The AG-CPE showed an enhanced electrochemical response, with sensitivity 1.6-fold greater than the signal obtained at the unmodified CPE in SWV. With AG-CPE, the linear dynamic range of PAP was found within the concentration range of 2.7-100 µM with a detection limit of 0.38 µM (S/B = 3), and a sensitivity of 1.2 µA L mol − 1. Using the proposed method, PAP was successfully detected in tap and dam water samples with standard addition method, suggesting that this method can be applied to determine this pollutant in wastewaters.
Comptes Rendus Chimie, 2016
Abstract Flavonoids due to their various interesting biological properties such as antifungal act... more Abstract Flavonoids due to their various interesting biological properties such as antifungal activity were investigated in Mentha piperita leaves. The butanolic fraction obtained from the hydro-alcoholic crude extract of M. piperita is rich in flavonoids; it reduced in vitro the mycelium growth of Phoma sorghina and Fusarium moniliforme around 72% and 55%, respectively, when used at a concentration of 5 mg/ml. In addition, the chemical conversion of the flavonoids in the butanolic fraction into their oxime derivatives increased the antifungal activity since the percentage of inhibition increased to 84% and 65% against P. sorghina and F. moniliforme , respectively, at 5 mg/ml. Butanolic fraction and oxime inhibition effects on spore germination of the two fungi were also observed. These results suggest that, M. piperita flavonoids could be used as botanical fungicides to protect cereals against infection from P. sorghina and F. moniliforme.
Journal of Electroanalytical Chemistry, 2004
The reduction of N-thioamidoimidates (1) has been examined in aprotic media at a mercury electrod... more The reduction of N-thioamidoimidates (1) has been examined in aprotic media at a mercury electrode. As shown by cyclic voltammetry at fast scan rates and controlled potential electrolysis, an overall irreversible one electron transfer is followed by a rapid second order chemical reaction leading to a dimer which involves to thiazolo[5,4-d]thiazole by intramolecular cyclization.
European Journal of Mass Spectrometry, 2012
Differentiation of flavonoid congeners remains a challenging analytical problem and confirming th... more Differentiation of flavonoid congeners remains a challenging analytical problem and confirming the structures of the different isomers is difficult, even when they can be adequately separated from mixtures. In the present report, in order to overcome the limits of our recently proposed method that relies on the distinctive CID behaviors of [(flavonoid – H+) + Cu2+] complexes to obtain direct structural evidences, we decided to investigate the possibility of using Pb(II) complexation to generate significant differences upon CID. We selected five flavonoid diglycosides with targeted structural features to estimate the applicability of this methodology. Electrospray ionization from methanol—not acetonitrile—solutions was advantageously used for preparing the [(flavonoid diglycoside – H+) + Pb2+]+ complexes. Upon collisional activation, [(flavonoid diglycoside – H+) + Pb2+]+ ions mainly dissociate by glycosidic bond cleavage. Nevertheless, specific cross-ring cleavages are also induced ...
Electrochimica Acta, 2007
Electrochemical study of N-thioamidoimidates 1 is carried out in non-aqueous solvent at platinum ... more Electrochemical study of N-thioamidoimidates 1 is carried out in non-aqueous solvent at platinum electrodes by means of cyclic voltammetry at different scan rates. A mechanistic investigation shows that the oxidation of the NH bond of these substrates leads, during ...
Instrumentation et Interdisciplinarité, 2020
Les effluents industriels issus des activités textiles présentent une grande charge polluante dif... more Les effluents industriels issus des activités textiles présentent une grande charge polluante difficilement biodégradable et qui a des impacts non négligeables sur l’environnement et l’Homme. Leur décontamination par les procédés conventionnels biologiques ou physiques est souvent inefficace et nécessite par conséquent le recours à des procédés d’oxydation avancée dont l’électrocoagulation. Dans le présent travail, nous avons étudié l’élimination par électrocoagulation du bleu de méthylène, modèle de colorant synthétique textile, en utilisant des électrodes de fer et d’aluminium. L’étude des paramètres pouvant influencer l’élimination par électrocoagulation du bleu de méthylène tels que le pH, la durée de l’électrolyse, la densité de courant et la nature de l’anode a montré que les meilleurs traitements sont obtenus avec un effluent de pH égal à 7 pendant 4 heures d’électrolyse à une densité de courant de 3,75 A/cm2 en utilisant l’électrode de fer. Dans ces conditions, le pourcentag...
Plants, 2021
Acacia macrostachya is used in Burkina Faso folk medicine for the treatment of inflammation and c... more Acacia macrostachya is used in Burkina Faso folk medicine for the treatment of inflammation and cancer. The purpose of this study was to evaluate the antioxidant and cytotoxic effects of this plant. The cytotoxic effects of root (dichloromethane B1 and methanol B2) and stem (dichloromethane B3 and methanol B4) bark extracts of A. macrostachya were assessed on chronic K562 and acute U937 myeloid leukemia cancer cells using trypan blue, Hoechst, and MitoTracker Red staining methods. The antioxidant content of extracts was evaluated using DPPH (2,2-diphenyl-1-picryl-hydrazyl) and FRAP (ferric reducing antioxidant power) methods. The root bark extracts B1 and B2 of A. macrostachya demonstrated higher cytotoxicity with IC50 values in a low µg/mL range on both U937 and K562 cells, while the stem bark B4 extract selectively affected U937 cells. Overall, healthy proliferating peripheral blood mononuclear cells (pPBMCs) were not or barely impacted in the range of concentrations cytotoxic to ...
European Journal of Medical and Health Sciences, 2020
In this work, the anti-diabetic activity of three extracts of Acacia macrostachya was investigate... more In this work, the anti-diabetic activity of three extracts of Acacia macrostachya was investigated by following the inhibitory effect of these extracts on -glucosidase using the in vitro model. The antiradical activity of these extracts was also determined. Methanol extracts of root and stem barks showed a very significant inhibitory effect against the enzyme activity of -glucosidase with IC50 2.487 ± 0.441 µg/mL and 1.650 ± 0.229 µg/mL respectively. For antiradical activity, the same extracts presented the highest scavenging of the radical DPPH● with IC50 values of 9.307 ± 0.262 µg/mL and 5.242 ± 0.068 µg/mL respectively. With the cationic radical ABTS●+, IC50 varied from 45.049 ± 0.730 µg/mL for methanolic root barks extract to 14.136 ± 0.161 µg/mL for methanolic extract from stem barks. Thus, the methanol extracts of the root and stem barks of Acacia macrostachya possess compounds with very interesting anti-diabetic and antiradical properties and could justify its traditional use.