Your browser doesn't support javascript.
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 11.692
Filtrar
1.
J Environ Sci (China) ; 85: 168-176, 2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-31471023

RESUMO

Cadmium (Cd) and arsenic (As) are two of the most toxic elements. However, the chemical behaviors of these two elements are different, making it challenging to utilize a single adsorbent with high adsorption capacity for both Cd(II) and As(V) removal. To solve this problem, we synthesized HA/Fe-Mn oxides-loaded biochar (HFMB), a novel ternary material, to perform this task, wherein scanning electron microscopy (SEM) combined with EDS (SEM-EDS) was used to characterize its morphological and physicochemical properties. The maximum adsorption capacity of HFMB was 67.11 mg/g for Cd(II) and 35.59 mg/g for As(V), which is much higher compared to pristine biochar (11.06 mg/g, 0 mg/g for Cd(II) and As(V), respectively). The adsorption characteristics were investigated by adsorption kinetics and the effects of the ionic strength and pH of solutions. X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FT-IR) revealed that chelation and deposition were the adsorption mechanisms that bound Cd(II) to HFMB, while ligand exchange was the adsorption mechanism that bound As(V).


Assuntos
Arsênico/química , Cádmio/química , Poluentes Ambientais/química , Carvão Vegetal , Óxidos/química
2.
J Enzyme Inhib Med Chem ; 34(1): 1465-1473, 2019 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-31411081

RESUMO

In this investigation, we studied a family of compounds with an oxathiazolidine-4-one-2,2-dioxide skeleton and their amide synthetic precursors as new anticonvulsant drugs. The cyclic structures were synthesized using a three-step protocol that include solvent-free reactions and microwave-assisted heating. The compounds were tested in vivo through maximal electroshock seizure test in mice. All the structures showed activity at the lower doses tested (30 mg/Kg) and no signs of neurotoxicity were detected. Compound encoded as 1g displayed strong anticonvulsant effects in comparison with known anticonvulsants (ED50 = 29 mg/Kg). First approximations about the mechanisms of action of the cyclic structures were proposed by docking simulations and in vitro assays against sodium channels (patch clamp methods).


Assuntos
Anticonvulsivantes/química , Anticonvulsivantes/farmacologia , Desenho de Drogas , Imidas/química , Imidas/farmacologia , Tiazóis/química , Animais , Anticonvulsivantes/administração & dosagem , Anticonvulsivantes/síntese química , Espectroscopia de Ressonância Magnética Nuclear de Carbono-13 , Relação Dose-Resposta a Droga , Células HEK293 , Humanos , Imidas/síntese química , Masculino , Camundongos , Canal de Sódio Disparado por Voltagem NAV1.1/efeitos dos fármacos , Óxidos/química , Técnicas de Patch-Clamp , Espectroscopia de Prótons por Ressonância Magnética
3.
Chem Commun (Camb) ; 55(66): 9857-9860, 2019 Aug 25.
Artigo em Inglês | MEDLINE | ID: mdl-31364637

RESUMO

A novel fluorescent sensing platform for telomerase activity assay was developed by coupling a three-dimensional (3D) DNA walker with the MnO2 nanosheet-upconversion nanoparticle (UCNPs) complex-based fluorescence resonance energy-transfer (FRET) system.


Assuntos
Técnicas Biossensoriais/métodos , DNA/química , Transferência Ressonante de Energia de Fluorescência/instrumentação , Compostos de Manganês/química , Nanoestruturas/química , Óxidos/química , Telomerase/metabolismo , Limite de Detecção
4.
Bioresour Technol ; 291: 121838, 2019 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-31344635

RESUMO

Replacing fossil energy by utilizing biomass as carbon source to convert metal oxides has meaning for reduction of minerals. Microwave pyrolysis of walnut shell for reduction process of low-grade pyrolusite was proposed. Thermogravimetric analysis indicated biomass pyrolysis process for reduction of pyrolusite was divided into four phases identified by temperatures: dehydration stage (<150 °C), pre-pyrolysis stage (150 °C-290 °C), curing decomposition stage (290 °C-480 °C) and carbonization stage (>480 °C), and manganese recovery reached 92.01% at 650 °C for 30 min with 18% walnut shell. The strongest preferential orientation of MnO was appeared, with good crystalline structure and no MnO2 and FeO peaks detected. The product surface became loose and porous with numerous cracks, pits and holes, and molten granules were interconnected and stacked with regular shape. The methods propose new idea of selective reduction of pyrolusite based on biomass pyrolysis by microwave heating.


Assuntos
Juglans/química , Biomassa , Carbono/química , Temperatura Alta , Compostos de Manganês/química , Micro-Ondas , Óxidos/química , Pirólise
6.
Chem Pharm Bull (Tokyo) ; 67(6): 519-526, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31155556

RESUMO

Chiral phosphine oxides successfully catalyze asymmetric cross-aldol reactions of various carbonyl compounds in a highly enantioselective manner. The phosphine oxide catalysts coordinate to chlorosilanes to form chiral hypervalent silicon complexes in situ, which activate both aldol donors and acceptors, thus realizing cross-aldol reactions between a ketone and an aldehyde, between two aldehydes, between two ketones, and of 2,6-diketones. The use of phosphine oxide catalysis can be further extended to achieve the first catalytic enantioselective double aldol reactions, realizing one-pot stereoselective construction of up to four stereogenic centers.


Assuntos
Aldeídos/química , Fosfinas/química , Catálise , Ciclização , Cetonas/química , Óxidos/química , Silício/química , Estereoisomerismo
7.
Talanta ; 202: 591-599, 2019 Sep 01.
Artigo em Inglês | MEDLINE | ID: mdl-31171226

RESUMO

Photodynamic therapy (PDT) was considered as an effective treatment. Whereas only PDT is not enough to achieve effective therapy on account of irradiation intensity decreases as depth increases as well as tumor hypoxia. Combination with gene therapy and photodynamic therapy have emerged as an effective strategy to improve therapeutic effectiveness. In the present study, a GSH responsive MnO2 was employed to delivery TB and DNAzyme for cancer imaging and PDT-gene combination treatment. TB, a photosensiters with aggregation-induced emission characteristic, was employed for photodynamic therapy, while DNAzyme, acting as catalysts for the degradation of EGR-1 mRNA, was exploited for gene silencing. All of the results of tumor treatment in vitro have implied that MnO2-DNAzyme-TB nanocomposite (MDT) can internalize into cells. Subsequently, MDT could decrease the expression of EGR-1 by gene silencing that enabling inhibition of cell growth. In addition, the singlet oxygen which was generated by the aggregated TB were able to further suppress cell growth. Combination therapy of photodynamic as well as gene therapy greatly enhanced antitumor efficiencies. Furthermore, in vivo tumor treatment experiments demonstrated that MDT under illumination can effectively inhibit the tumor growth of MCF-7 tumor-bearing mice by photodynamic and gene silencing combination therapy.


Assuntos
Antineoplásicos/farmacologia , DNA Catalítico/metabolismo , Terapia Genética , Compostos de Manganês/farmacologia , Óxidos/farmacologia , Fotoquimioterapia , Fármacos Fotossensibilizantes/farmacologia , Animais , Antineoplásicos/síntese química , Antineoplásicos/química , Proliferação de Células/efeitos dos fármacos , Sobrevivência Celular/efeitos dos fármacos , DNA Catalítico/química , Relação Dose-Resposta a Droga , Ensaios de Seleção de Medicamentos Antitumorais , Proteína 1 de Resposta de Crescimento Precoce/antagonistas & inibidores , Proteína 1 de Resposta de Crescimento Precoce/genética , Feminino , Humanos , Células MCF-7 , Neoplasias Mamárias Experimentais/diagnóstico por imagem , Neoplasias Mamárias Experimentais/tratamento farmacológico , Neoplasias Mamárias Experimentais/metabolismo , Compostos de Manganês/síntese química , Compostos de Manganês/química , Camundongos , Camundongos Nus , Nanocompostos , Imagem Óptica , Óxidos/síntese química , Óxidos/química , Tamanho da Partícula , Fármacos Fotossensibilizantes/síntese química , Fármacos Fotossensibilizantes/química , RNA Mensageiro/antagonistas & inibidores , RNA Mensageiro/genética , Relação Estrutura-Atividade , Propriedades de Superfície
9.
Ultrason Sonochem ; 57: 22-28, 2019 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-31208615

RESUMO

Bisphenol A (BPA) is an important emerging contaminant with endocrine-disrupting potential that has frequently been detected in aquatic environments. In this study, two types of hierarchically structured manganese dioxide/biochar nanocomposites (MnO2/BCs) were prepared for the first time via facile hydrothermal synthesis. The hydrothermal reaction was maintained at 100 °C for 6 h or 12 h, after which an ultrasound-assisted heterogeneous Fenton-like process was used to catalyze the removal of BPA under neutral pH condition. The characterization results indicated that MnO2 nanoparticles were successfully formed on the nanocomposite surfaces and had flower-like (δ-MnO2, 6 h) and urchin-like (α-MnO2, 12 h) morphology. This enabled a significant improvement in the catalytic activity of BPA removal by the reversible redox reaction. A series of experiments confirmed that the crystalline properties of the nanocomposites affected their catalytic activity. In particular, the α-MnO2/BCs exhibited catalytic activity in the ultrasound-assisted heterogeneous Fenton-like process and completely removed BPA within 20 min under the following conditions: [BPA]0 = 100 µM; [H2O2]0 = 10 mM; [catalyst]0 = 0.5 g/L; ultrasound = 20 kHz (130 W) at 40% amplitude; pH = 7.0 ±â€¯0.1; and temperature = 25 ±â€¯1 °C. This efficiency may have been due to the synergistic effect of ultrasound and α-MnO2/BCs, which simultaneously induce the effective generation of reactive free radicals and increase the mass transfer rate at the solid-liquid interface. Overall, these results demonstrated that hierarchical urchin-like α-MnO2/BCs have significant potential as an efficient and low-cost catalyst in ultrasound-assisted heterogeneous Fenton-like systems.


Assuntos
Compostos Benzidrílicos/isolamento & purificação , Carvão Vegetal/química , Compostos de Manganês/química , Nanocompostos/química , Óxidos/química , Fenóis/isolamento & purificação , Ondas Ultrassônicas , Catálise , Peróxido de Hidrogênio/química , Cinética , Oxirredução
10.
Chem Commun (Camb) ; 55(56): 8076-8078, 2019 Jul 18.
Artigo em Inglês | MEDLINE | ID: mdl-31225560

RESUMO

We developed a novel "signal-on" photoelectrochemical (PEC) aptasensor with a near-zero background signal by using AgVO3 as a single photoactive material for the sensitive detection of vascular endothelial growth factor (VEGF165).


Assuntos
Técnicas Biossensoriais , Técnicas Eletroquímicas/métodos , Óxidos/química , Processos Fotoquímicos , Prata/química , Compostos de Vanádio/química , Fator A de Crescimento do Endotélio Vascular/análise , Humanos , Limite de Detecção
11.
Environ Pollut ; 246: 990-998, 2019 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-31159148

RESUMO

Birnessites are abundant naturally occurring minerals with high sorption and oxidation capacity that could therefore play an important role in antimony (Sb) migration and transformation. There are various types of birnessites in the environment. However, little is known about the similarities and differences in Sb oxidation and sorption on birnessites with different properties. In this study, the behavior of Sb oxidation and sorption on two contrasting birnessites (δ-MnO2 and triclinic birnessite (TrBir)) were investigated via batch and kinetic experiments and various spectroscopic techniques. Our results showed that the reaction mechanisms between Sb and the two birnessites were similar. The edge sites of birnessites were responsible for Sb(III) oxidation. Mn(IV) was reduced to Mn(III) and Mn(II), bound with birnessites and released to the solution, respectively. Because of the rapid rate of electron transfer of adsorbed Sb(III) to birnessites, the only Sb species on δ-MnO2 after the oxidation reaction was Sb(V). Sb(V) was adsorbed at the edge sites of birnessites by replacing the OH group of birnessites, forming corner-sharing complexes with birnessites. However, the Sb sorption and oxidation capacities of the two birnessites were significantly different. Poorly-crystallized δ-MnO2 exhibited a much higher oxidation and sorption capacity than well-crystallized TrBir because the former had many more edge sites than the latter. This study reveals the general mechanism of the reaction between Sb and birnessite and indicates that birnessite with a high number of edge sites would exhibit a huge capacity in Sb oxidation and sorption.


Assuntos
Antimônio/química , Poluentes Ambientais/química , Óxidos/química , Adsorção , Cinética , Minerais/química , Oxirredução
12.
J Nanobiotechnology ; 17(1): 75, 2019 Jun 13.
Artigo em Inglês | MEDLINE | ID: mdl-31196217

RESUMO

BACKGROUND: To improve the outcome of cancer treatment, the combination of multiple therapy models has proved to be effective and promising. Gas therapy (GT) and chemodynamic therapy (CDT), mainly targeting the mitochondrion and nucleus, respectively, are two emerging strategy for anti-cancer. The development of novel nanomedicine for integrating these new therapy models is greatly significant and highly desired. METHODS: A new nanomedicine is programmed by successive encapsulation of MnO2 nanoparticles and iron carbonyl (FeCO) into mesoporous silica nanoparticle. By decoding the nanomedicine, acidity in the lysosome drives MnO2 to generate ROS, ·OH among which further triggers the decomposition of FeCO into CO, realizing the effective combination of chemodynamic therapy with gas therapy for the first time. RESULTS: Acidity in the TEM drives MnO2 to generate ROS, ∙OH among which further triggers the decomposition of FeCO into CO, realizing the effective combination of CDT and CDGT. The co-released ROS and CO do damage to DNA and mitochondria of various cancer cells, respectively. The mitochondrial damage can effectively cut off the ATP source required for DNA repair, causing a synergetic anti-cancer effect in vitro and in vivo. CONCLUSIONS: The combination of CDT and CDGT causing a synergetic anti-cancer effect in vitro and in vivo. The proposed therapy concept and nanomedicine designing strategy might open a new window for engineering high-performance anti-cancer nanomedicine.


Assuntos
Monóxido de Carbono/química , Compostos Carbonílicos de Ferro/química , Compostos de Manganês/química , Nanopartículas/química , Óxidos/química , Espécies Reativas de Oxigênio/química , Dióxido de Silício/química , Animais , Monóxido de Carbono/administração & dosagem , Linhagem Celular Tumoral , Sobrevivência Celular , Humanos , Camundongos Endogâmicos BALB C , Nanomedicina , Oxirredução , Porosidade , Espécies Reativas de Oxigênio/administração & dosagem
13.
Chem Commun (Camb) ; 55(54): 7836-7839, 2019 Jul 02.
Artigo em Inglês | MEDLINE | ID: mdl-31215559

RESUMO

It is of great importance to determine the superoxide anion (O2˙-), a kind of active free radical that plays important roles in catalytic and biological processes. We present here a high-energy-state biomimetic enzyme with extraordinary activity for O2˙- by inducing surface oxygen defects in MnTiO3 nanodiscs. Oxygen defects enable surface rich active Mn sites with high oxidation ability, which significantly promote the adsorption and electro-oxidation of O2˙-. The oxygen deficient MnTiO3 towards O2˙- exhibits a sensitivity of 126.48 µA µM-1 cm-2 and a detection limit of 1.54 nM, among the best performance of O2˙- sensing platforms.


Assuntos
Materiais Biomiméticos/química , Compostos de Manganês/química , Nanoestruturas/química , Óxidos/química , Superóxidos/análise , Titânio/química , Técnicas Eletroquímicas/métodos , Limite de Detecção , Oxirredução , Oxirredutases/química
14.
Braz Oral Res ; 33: e049, 2019 May 27.
Artigo em Inglês | MEDLINE | ID: mdl-31141039

RESUMO

The aim of the present study was to assess the penetration capacity of two endodontic cements, Endosequence BC Sealer and AH Plus, in artificial lateral canals. Twenty-six two-rooted, maxillary first premolars were instrumented to size 40.06 using K3 files. In each root, six lateral canals of two diameters (0.06 and 0.10 mm) were created with a working length of 2, 4, and 6 mm. The specimens were randomly divided into two groups according to the endodontic cement to be used (Endosequence BC Sealer and AH Plus) and obturated by the single-cone technique. The specimens were imaged by digital periapical radiography and scores from 0 to 4 were attributed according to the degree of penetration by sealers into the lateral canals. Data were analyzed statistically by Kruskal-Wallis and Student-Newman-Keuls tests, and a significance level of p < 0.05 was adopted. No significant difference was observed between the two endodontic cements used to fill the simulated lateral canals (p > 0.05). The diameter of lateral canals only influenced the capacity of the Endosequence BC Sealer in filling the canals, and presented greater penetration in the lateral canals of diameter 0.10 mm (p < 0.05). We concluded that the bioceramic endodontic cement Endosequence BC Sealer presented similar ability as AH Plus to fill simulated lateral canals.


Assuntos
Fosfatos de Cálcio/química , Cerâmica/química , Cavidade Pulpar/efeitos dos fármacos , Resinas Epóxi/química , Óxidos/química , Materiais Restauradores do Canal Radicular/química , Silicatos/química , Combinação de Medicamentos , Humanos , Teste de Materiais , Distribuição Aleatória , Valores de Referência , Reprodutibilidade dos Testes , Obturação do Canal Radicular/métodos , Estatísticas não Paramétricas
15.
Environ Monit Assess ; 191(6): 358, 2019 May 09.
Artigo em Inglês | MEDLINE | ID: mdl-31073910

RESUMO

Coal fly ash (CFA), a by-product generated from coal-burning power plants, readily leaches toxic elements into aquatic environments. The present study describes a classification system for CFA based on the chemical composition of CFA and leachability of toxic elements, which can promote the safe and effective utilization of CFA for uses such as fly ash cement. To classify CFA samples, the CaO content, leachate pH, leachability of toxic elements such as B, As, and Se, and the acid- and alkali-soluble Si and Al in glassy components were determined for ten types of CFA samples produced in Japan. The results indicated that the CFA samples could be grouped into three groups: group A, which was characterized by low CaO content, low leachate pH, and a relatively high amount of alkaline-soluble Al; group B, which was characterized by low CaO content, low leachate pH, and relatively low amount of alkaline-soluble Al; and group C, which was characterized by high CaO content, high leachate pH, and relatively low amount of alkaline-soluble Al. Characteristic of group A CFA was the simultaneous leaching of Al and the minor elements along with a gradual increase in pH. This type of CFA carries the risk of leaching toxic substances upon contact with alkali solutions. These results can aid the discovery and separation of safe and unsafe CFA, allowing the safe CFA to be used in cement to produce concrete under alkali conditions.


Assuntos
Cinza de Carvão/química , Monitoramento Ambiental , Substâncias Perigosas/análise , Compostos de Cálcio/química , Carvão Mineral , Materiais de Construção , Concentração de Íons de Hidrogênio , Japão , Óxidos/química , Fosfatos , Centrais Elétricas
16.
Environ Monit Assess ; 191(6): 389, 2019 May 22.
Artigo em Inglês | MEDLINE | ID: mdl-31119483

RESUMO

The purpose of this study was to determine the remediation effect of various substances (manure, clay, charcoal, zeolite and calcium oxide) on limiting the influence of high cobalt doses (0, 20, 40, 80, 160 and 320 mg/kg of soil) on the content of macroelements in grain, straw and roots of oat. The doses of cobalt applied in this experiment as well as soil amendments such as manure, clay, charcoal, zeolite and calcium oxide had a significant effect on the content of the analysed macronutrients in grain, straw and roots of oat. In the series without any neutralising substances, the soil contamination with cobalt caused an increase in the content of nitrogen, phosphorus, sodium, calcium and, partly, potassium, in grain, straw and roots of oat. Among the neutralising substances tested, the most unambiguous effect was produced by manure, which raised the content of all macronutrients (except calcium and magnesium) in oat grain, straw and roots. The influence of the other substances on the content of macronutrients in oat plants was less equivocal. However, all of them, especially calcium oxide, tended to induce a decrease in the content of most macronutrients in grain, straw and roots of oat.


Assuntos
Avena/química , Biodegradação Ambiental , Cobalto/análise , Grão Comestível/química , Monitoramento Ambiental/métodos , Nutrientes/análise , Poaceae/química , Poluentes do Solo/análise , Compostos de Cálcio/química , Carvão Vegetal/química , Argila/química , Esterco/análise , Nitrogênio , Óxidos/química , Fósforo , Raízes de Plantas/química , Solo , Zeolitas/química
17.
Chem Commun (Camb) ; 55(43): 6006-6009, 2019 May 28.
Artigo em Inglês | MEDLINE | ID: mdl-31049505

RESUMO

Herein, we report a dual-activatable MRI/PAI strategy for bimodal tumor imaging using an intelligent platform based on degradable MnO2 and a near-infrared absorptive polymer conjugated with BODIPY molecules. We believe the smart platform could promote the advance of numerous dual-activatable bimodal imaging techniques for biological applications.


Assuntos
Imagem por Ressonância Magnética/métodos , Compostos de Manganês/química , Óxidos/química , Técnicas Fotoacústicas/métodos , Polímeros/química , Animais , Compostos de Boro/química , Camundongos , Neoplasias Experimentais/metabolismo
18.
Chem Commun (Camb) ; 55(44): 6241-6244, 2019 May 28.
Artigo em Inglês | MEDLINE | ID: mdl-31086880

RESUMO

Glutathione (GSH) in tumors consumes 1O2 and seriously inhibits the PDT effect. MnO2-coated porphyrin metal-organic frameworks are developed to realize the oxidation of GSH by MnO2 for enhanced PDT, activated MR imaging, and controllable release of DOX as magnetic resonance imaging guided drug-PDT dual-therapy.


Assuntos
Glutationa/metabolismo , Imagem por Ressonância Magnética/métodos , Compostos de Manganês/química , Estruturas Metalorgânicas/química , Óxidos/química , Fotoquimioterapia/métodos , Porfirinas/química , Terapia Combinada
19.
Ultrason Sonochem ; 56: 134-142, 2019 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-31101247

RESUMO

Herein, we have reported a simple sonochemical synthesis of multi-layer graphene covered tungsten trioxide nanoballs (WO3 NBs) and the nanocomposite was characterized by FESEM, HRTEM, XRD, XPS, CV and EIS. Furthermore, progesterone (PGT) is a preferred marker for various biological problems like pregnancy problem, mood swings, anxiety, depression, nervousness and body pain. Therefore, its selective and sensitive determination in various biological fluids is beneficial for the evaluation of malformation problems. We describe the fabrication of an amperometric and non-enzymatic biosensor based on WO3 NBs@GR nanocomposite modified electrode for nanomolar detection of PGT. The results showed that the nanocomposite modified electrode exhibit well-defined electro-oxidation peak compared to bare and control electrodes, demonstrating the superior electrocatalytic ability and performances. The fabricated modified sensor was facilitates the analysis of PGT in the concentration ranges of 0.025-1792.5 µM with a low detection limit of 4.28 nM. Further, the as-prepared WO3 NBs@GR electrode has been applied to determination of PGT in human blood samples with outstanding recovery results and more importantly, the facile and environment-friendly sonochemical construction strategy extended here, may be open a cost-effective way for setting up the nanocomposites based (bio) sensing platform.


Assuntos
Eletroquímica/instrumentação , Grafite/química , Limite de Detecção , Óxidos/química , Tungstênio/química , Ondas Ultrassônicas , Catálise , Técnicas de Química Sintética , Eletrodos , Oxirredução , Propriedades de Superfície , Temperatura Ambiente
20.
Ultrason Sonochem ; 56: 318-326, 2019 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-31101269

RESUMO

A simple and facile ultrasound based sonochemical method to incorporate Perovskite-type barium titanate (BaTiO3) nanoparticles inside the layered and reduced graphene oxide sheets (rGOs) is reported. BaTiO3@rGOs nanocomposite was characterized by FESEM, HRTEM, EDX, mapping, XRD, XPS and EIS. The results show that the decoration and also incorporation of BaTiO3 nanoparticles in the multi-layered and ultrasound reduced graphene oxide matrix. Non-enzymatic and differential pulse voltammetric sensor of ractopamine (food toxic) based on the BaTiO3@rGOs nanocomposite modified screen printed carbon electrode is developed. Compared with the original BaTiO3/SPCE and rGOs/SPCE, the BaTiO3@rGOs/SPCE displays excellent current response towards ractopamine and gives linearity in the range of 0.01-527.19 µM ractopamine in neutral phosphate buffer (pH 7.0). The BaTiO3@rGOs nanocomposite modified sensor also exhibits valuable ability of anti-interference to electroactive analytes. Furthermore, the as-prepared BaTiO3 NPs@rGOs/SPCE has been applied to the determination of ractopamine in pork and chicken samples.


Assuntos
Compostos de Cálcio/química , Grafite/química , Carne/análise , Nanopartículas/química , Óxidos/química , Fenetilaminas/análise , Titânio/química , Ondas Ultrassônicas , Técnicas de Química Sintética , Eletroquímica , Eletrodos , Análise de Alimentos , Contaminação de Alimentos/análise , Modelos Moleculares , Conformação Molecular , Oxirredução , Propriedades de Superfície , Fatores de Tempo
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA