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1.
Food Chem ; 450: 139152, 2024 Apr 04.
Artigo em Inglês | MEDLINE | ID: mdl-38653046

RESUMO

The development of a robust electrocatalyst for the electrochemical sensor for hazardous pesticides will reduce its effects on the ecosystem. Herein, we synthesized the robust manganese cobalt phosphide (MnCoP) - Core-shell as an electrochemical sensor for the determination of hazardous pesticide methyl parathion (MP). The MnCoP- Core-shell was prepared with the sustainable self-template route can help with the larger surface area. The Core-shell structure of MnCoP possesses a higher active surface area which increases the electrocatalytic performance and is utilized to improve the electrochemical MP reduction with the synergism of the core and shell structure. Remarkably, it realizes the higher sensitivity (0.014 µA µM-1 cm-2) of MnCoP- Core-shell/GCE achieves towards MP with lower limit of detection (LoD 50 nM) and exceptional recovery rate of MP in vegetable samples are achieved with the differential pulse voltammetry (DPV) technique. The MnCoP- Core-shell electrode reserved their superior electrochemical performances with high reproducibility and repeatability. This prominent activity of the MnCoP core-shell towards the MP in real sample analysis, makes it a promising electrochemical sensor for the detection of MP.

2.
Chemosphere ; 356: 141895, 2024 May.
Artigo em Inglês | MEDLINE | ID: mdl-38579947

RESUMO

The over-exploitation of antibiotics in food and farming industries ruined the environmental and human health. Consequently, electrochemical sensors offer significant advantages in monitoring these compounds with high accuracy. Herein, MOF-derived hollow Co3S4@MoS2 (CS@MS) heterostructure has been prepared hydrothermally and applied to fabricate an electrochemical sensor to monitor nitrofuran class antibiotic drug. Various spectroscopic methodologies have been employed to elucidate the structural and morphological information. Our prepared electrocatalyst has better electrocatalytic performance than bare and other modified glassy carbon electrodes (GCE). Our CS@MS/GCE sensor exhibited a highly sensitive detection by offering a low limit of detection, good sensitivity, repeatability, reproducibility, and stability results. In addition, our sensor has shown a good selectivity towards the target analyte among other potential interferons. The practical reliability of the sensor was measured by analyzing various real-time environmental and biological samples and obtaining good recovery values. From the results, our fabricated CS@MS could be an active electrocatalyst material for an efficient electrochemical sensing application.


Assuntos
Cobalto , Técnicas Eletroquímicas , Furazolidona , Estruturas Metalorgânicas , Molibdênio , Técnicas Eletroquímicas/métodos , Furazolidona/análise , Catálise , Cobalto/química , Cobalto/análise , Molibdênio/química , Estruturas Metalorgânicas/química , Eletrodos , Dissulfetos/química , Limite de Detecção , Reprodutibilidade dos Testes , Antibacterianos/análise
3.
Molecules ; 28(20)2023 Oct 10.
Artigo em Inglês | MEDLINE | ID: mdl-37894499

RESUMO

Significant advancements have been made in the development of CO2 reduction processes for applications such as electrosynthesis, energy storage, and environmental remediation. Several materials have demonstrated great potential in achieving high activity and selectivity for the desired reduction products. Nevertheless, these advancements have primarily been limited to small-scale laboratory settings, and the considerable technical obstacles associated with large-scale CO2 reduction have not received sufficient attention. Many of the researchers have been faced with persistent challenges in the catalytic process, primarily stemming from the low Faraday efficiency, high overpotential, and low limiting current density observed in the production of the desired target product. The highlighted materials possess the capability to transform CO2 into various oxygenates, including ethanol, methanol, and formates, as well as hydrocarbons such as methane and ethane. A comprehensive summary of the recent research progress on these discussed types of electrocatalysts is provided, highlighting the detailed examination of their electrocatalytic activity enhancement strategies. This serves as a valuable reference for the development of highly efficient electrocatalysts with different orientations. This review encompasses the latest developments in catalyst materials and cell designs, presenting the leading materials utilized for the conversion of CO2 into various valuable products. Corresponding designs of cells and reactors are also included to provide a comprehensive overview of the advancements in this field.

4.
Pak J Pharm Sci ; 36(4(Special)): 1331-1336, 2023 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-37606024

RESUMO

Selenium is a mineral that is essential to human health and is widely recognized for its responsibilities as a powerful anticancer vitamin and antibacterial vitamin. Selenium also plays a critical part in the production of vitamin D. The purpose of this research was to evaluate the particular effects that selenium nano-particles (SeNPs') had on the infectious agent Staphylococcus aureus as well as the breast cancer cell lines MCF-7 and MDA-MB-231. The proportion of MDA-MB-231 and MCF-7 cells that underwent late apoptosis was dramatically increased by selenium nanoparticles, whereas the number of cells that underwent cell expansion was significantly reduced. There was a wide range of variability in the effects of selenium nanoparticle treatment on cell growth apoptosis, apoptosis rates and patterns of cell cycle arrest. After 2, 4 and 6 hours, researchers found that the development of S. aureus was significantly reduced by selenium nanoparticles at doses of 8.0, 16.0 and 32g/mL. In addition to this, the presence of selenium nanoparticles resulted in a reduced percentage of bacteria that were still alive. According to the findings of the study, there is a need for more research into selenium nanoparticles with the intention of preventing and treating infections caused by S. aureus.


Assuntos
Selênio , Humanos , Selênio/farmacologia , Células MCF-7 , Staphylococcus aureus , Vitaminas , Vitamina D
5.
Pak J Pharm Sci ; 36(4(Special)): 1343-1347, 2023 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-37606026

RESUMO

Moringa oleifera (MO) phytochemicals and therapeutic properties improve hyperglycemia and treat type 2 diabetes. Thus, this study examined the effects of MO leaf capsules on blood glucose management in type 2 diabetic mellitus (T2DM) and hypertension and their safety. A prospective placebo-controlled experiment randomly assigned 24 patients to receive 3g and 6g of MO leaf capsules twice a day or a placebo for three months. Pre- and post-study lab and clinical outcomes were assessed. The placebo control group and 3g MO leaf showed a minor change, whereas 6g and control placebo showed a considerable drop in examined features. MO usage was safe. In T2DM patients, MO leaves lowered blood pressure, requiring further study. MO leaves may help T2DM patients manage blood pressure and blood sugar, according to the study. MO's therapeutic components need more research.


Assuntos
Diabetes Mellitus Tipo 2 , Hipertensão , Moringa oleifera , Humanos , Diabetes Mellitus Tipo 2/complicações , Diabetes Mellitus Tipo 2/tratamento farmacológico , Cápsulas , Estudos Prospectivos , Hipertensão/tratamento farmacológico , Folhas de Planta
6.
Pak J Pharm Sci ; 36(3(Special)): 927-934, 2023 May.
Artigo em Inglês | MEDLINE | ID: mdl-37587700

RESUMO

Aspergillus fumigatus is a green echinulate with greenish phialides and 2.5-3 mm conidia. The diverse biological functions of A. fumigatus secondary metabolites make them interesting. The ethyl acetate extract of A. fumigatus was tested for antibacterial activity. Culture media, temperature, incubation and pH were optimized for A. fumigatus growth. Continuous 150rpm agitation incubated the fungus at 28°C for 10 days. Potato Dextrose Broth at 28°C in shaking incubator at pH 04 produced the most biomass and secondary metabolites. Metabolite antibacterial activity was tested. Salmonella flexneri had the greatest zone of inhibition at 100µl (25.66mm) while Staphylococcus aureus had the least (16.33mm). At 75µg/mL, S. flexneri showed 23.66mm activity and S. typhi 14.66mm. At 50µg/mL, S. flexneri was 21.33mm and S. typhi 12.33mmMBC was 0.01µg/µl and MIC50 varied. At 100µg/mL, the metabolites showed antifungal efficacy against Penicillium chrysogenum (26.33mm) but not A. flavus (21.33mm). A. oryzae was significantly inhibited at 75µg/mL (26.33mm) and 50µg/mL (20.33mm). 1000µl demonstrated 100% phytotoxicity, 100µl 60% and 10µl 50%. Bactrocera cucurbitae, Sitotroga cerealella and Callosobruchus maculatus were killed at 150, 100 and 75µl. Metabolites and antibiotics synergized well. Metabolites have alkanes, esters and ethers in their infrared spectra.


Assuntos
Alcanos , Aspergillus fumigatus , Antibacterianos/farmacologia , Antifúngicos/farmacologia , Biomassa
7.
Pak J Pharm Sci ; 36(3(Special)): 1009-1015, 2023 May.
Artigo em Inglês | MEDLINE | ID: mdl-37587711

RESUMO

Cirrhosis and liver cancer are both caused by hepatitis C virus (HCV) infection of the liver. Patients with HCV cirrhosis may be treated with one of many antiviral medications, depending on their specific genotype. Samples of cirrhotic HCV were obtained from 190 people at the Khyber Teaching Hospital and the Hayatabad Medical Complex in Peshawar, Pakistan. Multiplex and real-time PCR were used to assess the genotypes and viral loads of the samples, respectively. Sixty patients were given sofosbuvir plus daclatasvir with ribavirin, while the remaining 56 patients were given sofosbuvir with ribavirin for a period of 12-24 weeks. LFTs were also tracked both before and after therapy. Group I (sofosbuvir + daclatasvir) had a sustained virological response of 82.70 percent. Group II (sofosbuvir + daclatasvir with ribavirin) had an 86% sustained virological response, whereas group III (84% sustained virological response) received only ribavirin. When compared to other genotypes, genotype 3 showed the most impressive sustained virologic response (SVR) to the antiviral medicines. Based on the results of this trial, we propose sofosbuvir + daclatasvir ribavirin for the treatment of cirrhotic patients with various HCV genotypes since it produces the greatest sustained virological response.


Assuntos
Antivirais , Hepatite C , Humanos , Antivirais/uso terapêutico , Genótipo , Hepacivirus/genética , Hepatite C/tratamento farmacológico , Cirrose Hepática/tratamento farmacológico , Ribavirina/uso terapêutico , Sofosbuvir/uso terapêutico , Resposta Viral Sustentada
8.
Pak J Pharm Sci ; 36(2(Special)): 601-605, 2023 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-37548196

RESUMO

Type 2 diabetes mellitus is characterized by hyperglycemia and insulin resistance. It is spreading around the globe like a pandemic. Major factors behind the development of diabetes can be genetics, environmental factors, dietary choices and obesity. Many medicinal plants have anti-diabetic potential. This study has investigated the anti-diabetic effect of curry leaves extract. This study also investigated the chemical characterization of curry leaves. Phytochemicals including saponins, tannins, alkaloids, flavonoids, phenols and glycosides were also investigated. Encapsulated 5mg per kg of the body weight and 10mg per kg of the body weight were given to treatment groups I and II. Random blood sugar, fasting blood sugar and HbA1c of 45 diabetic female adults were measured on the 0-day and 45th days. All results were analyzed using the two-sample t-test in IBM SPSS Statistics 20. Curry leaves contained moisture (24.1±1.78)%, ash (17.82±2.13)%, nitrogen free extract (36.12±3.52)%, crude protein (8.32±0.83)%, crude fiber (6.98±2.31)% and crude fat (6.87±0.21)%. Mineral analysis showed that magnesium and calcium were major minerals present in curry leaves. Curry leaves extract contained saponins 2.71±0.23, flavonoids 7.84±0.42, tannins 0.91±0.09, glycosides 0.17±0.01, phenols 3.89±0.12, alkaloids 2.01±0.87. These phytochemicals were expressed in mg/100 g of the sample. Curry leaf extract showed a significant (p<0.05) reduction in fasting blood sugar, random blood sugar and glycated hemoglobin in both treatment groups.


Assuntos
Alcaloides , Diabetes Mellitus Tipo 2 , Murraya , Saponinas , Adulto , Humanos , Diabetes Mellitus Tipo 2/tratamento farmacológico , Glicemia/metabolismo , Murraya/química , Taninos/análise , Extratos Vegetais/farmacologia , Extratos Vegetais/uso terapêutico , Extratos Vegetais/análise , Alcaloides/análise , Compostos Fitoquímicos/uso terapêutico , Compostos Fitoquímicos/análise , Flavonoides/uso terapêutico , Flavonoides/análise , Fenóis/análise , Suplementos Nutricionais/análise , Glicosídeos , Saponinas/uso terapêutico , Saponinas/análise , Peso Corporal , Folhas de Planta/química
9.
Pak J Pharm Sci ; 36(2(Special)): 613-617, 2023 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-37548198

RESUMO

Citrus sinensis is an important member of the genus Citrus which contains phenolic compounds and bioflavonoids which have antihyperlipidemic and antiatherogenic effects. It also has the potential to reduce oxidative stress. To investigate the antihyperlipidemic effect of orange peel powder was encapsulated and analyzed in hyperlipidemic patients. Results showed that it contains moisture (12.2%), ash content (7.9%), crude fat (0.78%), crude protein (12.37%) and crude fiber (13.2%). Total phenolic content and total flavonoid content were observed as 163.17 mg and 17.23mg in quercetin equivalent per gram a dry weight basis. Furthermore, the Orange peel powder was given in the form of medicinal capsules to hyperlipidemia male subjects. The experimental groups (G1 and G2) were given orange peel powder in capsules 400mg/d to the G1 group and 800mg/d to the G2 group for the time of 45 days. The serum lipid profile of patients was measured before and after the experimental trial. The result showed that G1 and G2 showed a decrease in plasma lipid parameters and increased high-density lipoprotein content in blood substantially as compared to G0. Thus, it was concluded from the results that orange peel powder depicts a significant impact on treating hyperlipidemia.


Assuntos
Citrus sinensis , Citrus , Hiperlipidemias , Humanos , Masculino , Cápsulas , Citrus/química , Citrus sinensis/química , Flavonoides , Hiperlipidemias/tratamento farmacológico , Hipolipemiantes/farmacologia , Hipolipemiantes/uso terapêutico , Lipídeos , Fenóis , Pós
10.
Pak J Pharm Sci ; 36(2(Special)): 625-629, 2023 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-37548200

RESUMO

Hyperglycemia is a condition often observed in diabetics, dyslipidemia and obese. It is a major factor behind the development of diabetes and the reasons can be genetics, environmental factors, dietary choices and obesity. Many medicinal plants have anti-diabetic potential. This study investigated the anti-hyperglycemic effect of apple peel extract. This study also investigated the chemical characterization of apple peel. Phytochemicals including total phenolics and flavonoids were determined. Encapsulated 350mg/day was given to treatment groups. Random blood sugar, fasting blood sugar and HbA1c of 45 diabetic female adults was measured on the 0-day and 45th day. Results showed that apple peel contained moisture (14.71±3.57)%, ash (17.82±2.13)%, nitrogen free extract (32.12±3.52)%, crude protein (6.89±0.83)%, crude fiber (19.17±0.21)% and crude fat (9.91±2.31)%. Findings showed that apple peel contains magnesium (6.61±1.088), calcium (8.17±0.32), zinc (14.08±1.21) and potassium (67.21±1.86). These findings were shown in mg in kg. Apple peel extract contained total phenolic content (TPC) of 8.14±1.07 and total phenolic content (TFC) of 4.89±1.81. Apple peel extract showed a significant reduction in all blood parameters of hyperglycemia. All results were significant at p<0.05.


Assuntos
Hiperglicemia , Malus , Humanos , Malus/química , Frutas/química , Antioxidantes/química , Glicemia/análise , Fenóis/análise , Suplementos Nutricionais , Hiperglicemia/tratamento farmacológico
11.
Nanomaterials (Basel) ; 13(13)2023 Jul 05.
Artigo em Inglês | MEDLINE | ID: mdl-37446527

RESUMO

Water electrolysis is an important alternative technology for large-scale hydrogen production to facilitate the development of green energy technology. As such, many efforts have been devoted over the past three decades to producing novel electrocatalysis with strong electrochemical (EC) performance using inexpensive electrocatalysts. Transition metal oxyhydroxide (OxH)-based electrocatalysts have received substantial interest, and prominent results have been achieved for the hydrogen evolution reaction (HER) under alkaline conditions. Herein, the extensive research focusing on the discussion of OxH-based electrocatalysts is comprehensively highlighted. The general forms of the water-splitting mechanism are described to provide a profound understanding of the mechanism, and their scaling relation activities for OxH electrode materials are given. This paper summarizes the current developments on the EC performance of transition metal OxHs, rare metal OxHs, polymers, and MXene-supported OxH-based electrocatalysts. Additionally, an outline of the suggested HER, OER, and water-splitting processes on transition metal OxH-based electrocatalysts, their primary applications, existing problems, and their EC performance prospects are discussed. Furthermore, this review article discusses the production of energy sources from the proton and electron transfer processes. The highlighted electrocatalysts have received substantial interest to boost the synergetic electrochemical effects to improve the economy of the use of hydrogen, which is one of best ways to fulfill the global energy requirements and address environmental crises. This article also provides useful information regarding the development of OxH electrodes with a hierarchical nanostructure for the water-splitting reaction. Finally, the challenges with the reaction and perspectives for the future development of OxH are elaborated.

12.
Sci Rep ; 13(1): 7640, 2023 05 11.
Artigo em Inglês | MEDLINE | ID: mdl-37169860

RESUMO

Patients with device detected atrial high-rate episodes (AHRE) have an increased risk of MACE. The R2CHA2DS2-VASc, CHADS2, R2CHADS2 and CHA2DS2-VASc score have been investigated for predicting major adverse cardiovascular events (MACE) in different groups of patients. We aimed to evaluate the R2CHA2DS2-VASc score in combination with AHRE ≥ 6 min for predicting MACE in patients with dual-chamber PPM but no prior atrial fibrillation (AF). We retrospectively enrolled 376 consecutive patients undergoing dual-chamber PPM implantation and no prior AF. The primary endpoint was subsequent MACE. For all patients in the cohort, CHADS2, R2CHADS2, CHA2DS2-VASc, R2CHA2DS2-VASc scores and AHRE ≥ or < 6 min were determined. AHRE was recorded as a heart rate > 175 bpm (Medtronic) or > 200 bpm (Biotronik) lasting ≥ 30 s. Multivariate Cox regression analysis with time-dependent covariates was used to determine the independent predictors of MACE. ROC-AUC analysis was performed for CHADS2, R2CHADS2, CHA2DS2-VASc, and R2CHA2DS2-VASc scores and then adding AHRE ≥ 6 min to the four scores. The median age was 77 years, and 107 patients (28.5%) developed AHRE ≥ 6 min. After a median follow-up of 32 months, 46 (12.2%) MACE occurred. Multivariate Cox regression analysis showed that R2CHA2DS2-VASc score (HR, 1.485; 95% CI, 1.212-1.818; p < 0.001) and AHRE ≥ 6 min (HR, 2.125; 95% CI, 1.162-3.887; p = 0.014) were independent predictors for MACE. The optimal R2CHA2DS2-VASc score cutoff value was 4.5 (set at ≥ 5), with the highest Youden index (AUC, 0.770; 95% CI, 0.709-0.831; p < 0.001). ROC-AUC analysis of the four risk scores separately combined with AHRE ≥ 6 min all showed better discriminatory power than the four scores alone (All Z-statistic p < 0.05). In patients with PPM who develop AHRE ≥ 6 min, it is crucial to perform risk assessment with either four scores to further stratify risk for MACE.


Assuntos
Fibrilação Atrial , Acidente Vascular Cerebral , Humanos , Idoso , Prognóstico , Estudos Retrospectivos , Acidente Vascular Cerebral/etiologia , Valor Preditivo dos Testes , Fatores de Risco , Medição de Risco
13.
J Colloid Interface Sci ; 643: 600-612, 2023 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-37003869

RESUMO

Engineering the nanostructure of an electrocatalyst is crucial in developing a high-performance electrochemical sensor. This work exhibits the hydrothermal followed by annealing synthesis of niobium oxide/niobium carbide/reduced graphene oxide (NbO/NbC/rGO) ternary nanocomposite. The oval-shaped NbO/NbC nanoparticles cover the surface of rGO evenly, and the rGO nanosheets are interlinked to produce a micro-flower-like architecture. The NbO/NbC/rGO nanocomposite-modified electrode is presented here for the first time for the rapid and sensitive electrochemical detection of the anticancer drug methotrexate (MTX). Down-sized NbO/NbC nanoparticles and rGO's high surface area provide many active sites with a rapid electron transfer rate, making them ideal for MTX detection. In comparison to previously reported MTX sensors, the developed drug sensor exhibits a lower oxidation potential and a higher peak current responsiveness. The constructed sensors worked analytically well under optimal conditions, as shown by a low detection limit of 1.6 nM, a broad linear range of 0.1-850 µM, and significant recovery findings (∼98 %, (n = 3)) in real samples analysis. Thus, NbO/NbC/rGO nanocomposite material for high-performance electrochemical applications seems promising.


Assuntos
Antineoplásicos , Grafite , Nanocompostos , Óxidos/química , Nióbio/química , Metotrexato , Técnicas Eletroquímicas , Grafite/química , Nanocompostos/química
14.
Inorg Chem ; 62(4): 1437-1446, 2023 Jan 30.
Artigo em Inglês | MEDLINE | ID: mdl-36652943

RESUMO

An electrocatalyst with a large active site is critical for the development of a high-performance electrochemical sensor. This work demonstrates the fabrication of an iron diselenide (FeSe2)-modified screen-printed carbon electrode (SPCE) for the electrochemical determination of furaltadone (FLD). It has been prepared by the facile method and systematically characterized with various microscopic/spectroscopic approaches. Due to advantageous physiochemical properties, the FeSe2/SPCE showed a low charge-transfer resistance value of 200 Ω in 5.0 mM [Fe(CN)6]3-/4- containing 0.1 M KCl. More importantly, the FeSe2/SPCE exhibited superior catalytic performance compared to the bare SPCE for FLD sensing based on the electrochemical response in terms of a peak potential of -0.44 V (vs Ag/AgCl (sat. KCl)) and cathodic response current of -22.8 µA. Operating at optimal conditions, the FeSe2-modified electrode showed wide linearity from 0.01 to 252.2 µM with a limit of detection of 0.002 µM and sensitivity of 1.15 µA µM-1 cm-2. The analytical performance of the FeSe2-based platform is significantly higher than many previously reported FLD electrochemical sensors. Furthermore, the FeSe2/SPCE also has a promising platform for FLD detection with high sensitivity, good selectivity, excellent stability, and robust reproducibility. Thus, the finding above shows that the FeSe2/SPCE is a highly suitable candidate for the electrochemical determination of glucose levels for real-time applications such as in human urine and river water samples.

15.
Chemosphere ; 318: 137948, 2023 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-36716937

RESUMO

This study demonstrates a hydrothermal method to prepare perovskite-type potassium niobate (KNbO3) through deep eutectic solvent (DES), which is further used as an electrode material for the determination of bisphenol A (BPA). The as-synthesized KNbO3 was systematically characterized by different microscopic and spectroscopic techniques. The KNbO3-modified electrode demonstrates excellent electrocatalytic activity for BPA compared to the pristine electrode. The enhanced performance of the proposed sensor is attributed to the numerous active sites, large electrochemical surface area, high electrical conductivity, and rapid electron transfer. The fabricated sensor shows a wide detection range (0.01-84.3 µM), a low limit of detection (0.003 µM), a high sensitivity (0.51 µA µM-1 cm-2), and good anti-interference abilities towards the BPA detection by linear sweep voltammetry method. Besides, it was successfully applied to determining BPA in food samples, demonstrating good practicability. This design paves a new way to fabricate efficient electrode material for various electrochemical applications using a DES medium.


Assuntos
Solventes Eutéticos Profundos , Técnicas Eletroquímicas , Eletrodos , Técnicas Eletroquímicas/métodos
16.
Chemosphere ; 313: 137553, 2023 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-36521748

RESUMO

Boosting catalytic performance as a vital role for an electrochemical sensor for monitoring various hazardous nitro drugs. Herein, an inexpensive, facile, and eco-friendly construction of praseodymium tungstate decorated on three dimensional porous biocarbon (PrW/3D-PBC) for electrochemical determination of carcinogenic residue furazolidone (FZ). The nanostructured PrW nanoparticles were prepared by solvent evaporation from peroxo-tungstic acid and 3D-PBC was prepared from biomass precursor under the carbonization method. Furthermore, the composite of PrW decorated on 3D-PBC was prepared by an ultrasonic-assisted wet chemical approach. Besides, the composite characterization of crystalline, functional group, degree of carbonization, chemical states, and morphology were utilized by theXRD, FTIR, RAMAN, XPS, and FESEM analysis. These 3D porous carbon decorated PrW nanoparticles facilitate the electrochemical anchoring sites, surface area, and ease of diffusion layers towards the detection of hazardous nitro pollutant FZ by using CV analysis. The low LOD and high sensitivity were achieved by FZ determination through using LSV and DPV techniques. The practical capability of the PrW/3D-PBC/GCE sensor was determined by using aquatic samples to achieve a good recovery result. These results instigate that the PrW/3D-PBC will be an efficient electrocatalytic material for FZ sensor in environmental aquatic samples.


Assuntos
Furazolidona , Praseodímio , Eletrodos , Técnicas Eletroquímicas/métodos , Porosidade
17.
Food Chem ; 404(Pt A): 134516, 2023 Mar 15.
Artigo em Inglês | MEDLINE | ID: mdl-36240561

RESUMO

2,4,6-Trichlorophenol (TCP) is the most widely used pesticide in the world and has a devastating effect on the environment and human health. As a result of the use of pyrochlore type La2Sn2O7 hexagonal nanosheet (La2Sn2O7 HNS) modified electrode, this work reports on the quick and sensitive electrochemical detection of TCP. The La2Sn2O7 HNS is reported here for the first time and has been made using a simple precipitation and calcination technique. The crystal structure and surface morphologies of La2Sn2O7 HNS have been characterized using XRD, XPS, HR-TEM, and FE-SEM analyses. Detection limits of 0.074 µM and sensitivity of 1.5 µA µM-1 cm-2 were achieved using the La2Sn2O7 HNS for TCP detection. It also showed decent selectivity among the common interfering molecules. Additionally, the La2Sn2O7 HNS/GCE sensor was able to detect TCP in water and vegetable samples with >90 % recovery, proving its appropriateness for quick TCP detection.


Assuntos
Clorofenóis , Praguicidas , Humanos , Lantânio/química , Técnicas Eletroquímicas/métodos , Eletrodos
18.
RSC Adv ; 12(43): 28227-28244, 2022 Sep 28.
Artigo em Inglês | MEDLINE | ID: mdl-36320254

RESUMO

Water electrolysis is the most promising method for the production of large scalable hydrogen (H2), which can fulfill the global energy demand of modern society. H2-based fuel cell transportation has been operating with zero greenhouse emission to improve both indoor and outdoor air quality, in addition to the development of economically viable sustainable green energy for widespread electrochemical applications. Many countries have been eagerly focusing on the development of renewable as well as H2-based energy storage infrastructure to fulfill their growing energy demands and sustainable goals. This review article mainly discusses the development of different kinds of fuel cell electrocatalysts, and their application in H2 production through various processes (chemical, refining, and electrochemical). The fuel cell parameters such as redox properties, cost-effectiveness, ecofriendlyness, conductivity, and better electrode stability have also been highlighted. In particular, a detailed discussion has been carried out with sufficient insights into the sustainable development of future green energy economy.

19.
Chemosphere ; 307(Pt 3): 136014, 2022 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-35970216

RESUMO

Polycyclic aromatic hydrocarbons (PAHs) are environmentally recalcitrant contaminants formed from naturally or incomplete combustion of organic materials and some of them are difficult to degrade due to their hydrophobicity and persistency. Benzo [a]pyrene (BaP), is one of PAHs that having five fused benzene and reported as mutagenic, carcinogenic and teratogenic compounds. Biodegradation is one of promising techniques due to its relatively low economic cost and microorganism is a natural capacity to consume hydrocarbons. In this investigation, Pleurotus eryngii F032 was grown in 20 mL of modified mineral salt broth (MSB) supplemented with BaP under static and agitated culture. Within 20 days, static culture removed 59% of BaP, whereas agitated culture removed the highest amount (73%). To expedite BaP elimination, the mechanism and behavior of BaP biosorption and biotransformation by Pleurotus eryngii F032 were additionally examined by gas chromatography-mass spectrometer (GC-MS). The optimal conditions for P. eryngii F032 to eliminate BaP were 25 °C, a C/N ratio of 8, pH 3 and 0.2% inoculum concentration. At an initial BaP content of 10 mg/L, more than 50% was effectively eliminated within 20 days under these conditions. Salinity, glucose, and rhamnolipids were the most important factors impacting BaP biodegradation. GC-MS found degradation products such as BaP-3,6-quinone, indicating plausible metabolic routes. Finally, it may be assumed that the primary mechanism by which white-rot fungi eliminate BaP is by the utilization of biotransformation enzymes such as laccase to mineralize the PAHs. Hence, Pleurotus eryngii F032 could be an ideal candidate to treat PAHs contaminated soils.


Assuntos
Pleurotus , Hidrocarbonetos Policíclicos Aromáticos , Benzeno/metabolismo , Benzo(a)pireno/metabolismo , Benzo(a)pireno/toxicidade , Biodegradação Ambiental , Glucose/metabolismo , Lacase/metabolismo , Minerais/metabolismo , Pleurotus/metabolismo , Hidrocarbonetos Policíclicos Aromáticos/química , Quinonas/metabolismo , Solo
20.
Food Chem ; 397: 133791, 2022 Dec 15.
Artigo em Inglês | MEDLINE | ID: mdl-35917784

RESUMO

Herein we report the ternary hybrid nanocomposite of iron oxide @ molybdenum carbide micro flowers decorated graphitic-carbon nitride (Fe3O4@MoC MFs/g-CN), as a catalyst for the detection of organophosphorus pesticide, parathion (PAT), for the first time. The growth of hierarchical nanostructure from the core level will facilitate easy diffusion of analyte and interact more effectively with the reactive catalytic sites. Thus, Fe3O4 NFs architecture was hydrothermally grown over MoC flakes from the core level, which further hybridized with g-CN to ensure electrical conductivity and mechanical stability. Experimental results demonstrate that Fe3O4@MoC MFs/g-CN/GCE has superior catalytic efficacy for PAT reduction. At optimum conditions, the proposed sensor exhibits a low detection limit (7.8 nM), high sensitivity, and wide linear range (0.5-600 µM) toward PAT detection. The satisfactory test results of the food samples indicate that the Fe3O4@MoC MFs/g-CN/GCE sensor can be used as an excellent candidate for real-time PAT detection.


Assuntos
Inseticidas , Nanocompostos , Praguicidas , Técnicas Eletroquímicas/métodos , Compostos Férricos/química , Flores/química , Grafite , Inseticidas/análise , Molibdênio , Nanocompostos/química , Compostos de Nitrogênio , Organofosfatos , Compostos Organofosforados
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