Chitosan/mangiferin particles for Cr(VI) reduction and removal

Sampaio, Caroline de Goes; Frota, Lucas S.; Magalhães, Herbert S.; Dutra, Lilian M.U.; Queiroz, Danilo C.; Araújo, Rinaldo dos Santos; Becker, Helena; Souza, José Roberto Rodrigues de; Ricardo, Nágila M.P.S.; Trevisan, Maria Teresa

doi:10.1016/j.ijbiomac.2015.03.038

Cited by 28 publications

(10 citation statements)

References 34 publications

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“…Today, the removal of metal ions from industrial wastewaters remains problematic. Various techniques can be applied for the removal of heavy metals, including spray-drying [7], precipitation polymerization [8], ion-exchange [9], electrochemical reaction [10], reverse osmosis and adsorption [11,12]. Adsorption is considered as one of the most cost-effective methods, considering investment costs, energy consumption, throughput capacity, emission standards and toxic by-products generation [13].…”

Section: Introductionmentioning

confidence: 99%

Selective heavy metal removal and water purification by microfluidically-generated chitosan microspheres: Characteristics, modeling and application

Wang

Bai

Jiang

et al. 2019

Journal of Hazardous Materials

130

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Many industrial wastewater streams contain heavy metals, posing serious and irreversible damage to humans and living organisms, even at low concentrations due to their high toxicity and persistence in the environment. In this study, high-performance monodispersed chitosan (CS) microspheres were prepared using a simple microfluidic method and evaluated for metal removal from contaminated water. Batch experiments were carried out to evaluate the adsorption characteristics for the removal of copper ions, one representative heavy metal, from aqueous solutions. The inherent advantages of microfluidics enabled a precise control of particle size (CV=2.3%), while exhibiting outstanding selectivity towards target ions (adsorption capacity 75.52 mg g-1) and fair regeneration (re-adsorption efficiency 74% after 5 cycles). An integrated adsorption mechanism analytic system was developed based on different adsorption kinetics and isotherms models, providing an excellent adsorption prediction model with pseudo-second order kinetics (R 2 = 0.999), while the isotherm was fitted best to the Langmuir model (R 2 = 0.998). The multi-step adsorption process was revealed via quantitative measurements and schematically described. Selective adsorption performance of CS microspheres in the present of other competitive metal ions with different valence states has been demonstrated and studied by both experimental and density functional theory (DFT) analysis.

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Section: Introductionmentioning

confidence: 99%

Selective heavy metal removal and water purification by microfluidically-generated chitosan microspheres: Characteristics, modeling and application

Wang

Bai

Jiang

et al. 2019

Journal of Hazardous Materials

130

View full text Add to dashboard Cite

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“…[66] It is important to note that CS-based encapsulation systems reported in literature, usually involved CS of low molecular weight (<100KDa). For instance, a protein was added into aqueous mixtures containing CS-Tripolyphosphate (TPP)-Vitamin C. [67] Other examples include CS-Tween 80-Mangiferin, [68] CS-Mannitol-Calcitonin, [69] etc. The reader should take into account that the examples cited are ternary systems.…”

Section: Ftirmentioning

confidence: 99%

High molecular weight chitosan based particles for insulin encapsulation obtained via nanospray technology

et al. 2020

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The objective of this work was to obtain Chitosan (CS) based particles for Insulin (INS) encapsulation, via nanospray drying of a feeding solution containing equal amounts of both components (0.1% w/v total solids content). The process was performed at pH 3 which is out of the range for electrostatic interactions to occur. The analysis involved the nanoparticles (NP) characterization in the solution before drying (pH 3) by dynamic light scattering (DLS) and after re-hydration at different pHs (3< pH < 11). The dried product was characterized by Fourier-transform spectroscopy (FTIR), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). FTIR allowed detecting the chemical groups involved in INS-CS interactions. The encapsulation efficiency of the glassy NP was 62.3 ± 0.32% as determined by HPLC. Upon powder re-hydration, NP of diameter <200 nm were obtained, with a minority of them exceeding the micron. The change in the shape and temperature of the main endothermic DSC peak and the higher T g value of the NP would confirm the increase in INS thermal stability when entrapped in a CS matrix. In terms of biological activity an in-vitro system was assayed. 3T3-L1 fibroblasts were exposed to INS and Insulin-Chitosan nanoparticles (INS-CS NP). Both treatments showed AKT phosphorylation, which is an indication of AKT activation. The activity of AKT plays an essential role in cell metabolism (lipid and glucose), growth, proliferation, polarity, among others. This activity is a measure of the upstream cell signals, i.e. INS's receptor activity. Phosphorylated AKT was detected during the assay time for INS-CS NP, showing remarkable differences respect to single INS. Nanodrying technology could be used to trap INS into CS matrix keeping the specific hormone functions and protecting it from the hostile conditions of the body.

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“…A mesma foi obtida a partir de extração do caule da planta Mangifera indica L. (mangueira), utilizando o etanol como solvente extrator. O procedimento de obtenção e purificação da Mangiferina está devidamente apresentada na literatura [11].…”

Section: Materiais E Métodosunclassified

Estudo da Inibição de Corrosão do aço carbono em ácido clorídricona presença de mangiferina

Santos

Barroso

Parente³

et al. 2016

Matéria (Rio J.)

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RESUMOControlar, ou inibir cineticamente o processo corrosivo tem sido um grande desafio para a ciência. Desta forma, tem-se buscado estudar os diversos tipos de interações entre material e meio. A utilização de inibidores constitui um dos métodos usuais de proteção contra a corrosão. No entanto, há uma preocupação crescente sobre a toxicidade da maior parte dos inibidores de corrosão. Vários trabalhos científicos têm sido realizados que comprovam a ação inibidora de extratos de plantas frente à corrosão de metais. Este estudo tem por objetivo verificar efeito inibidor da Mangiferina, substância obtida a partir da extração do caule da planta Mangifera indica L, frente ao processo corrosivo em aço carbono. Para isso, foram realizados ensaios de perda de massa coadjuvados com técnicas eletroquímicas em meio de ácido clorídrico. Os resultados obtidos mostraram que aço carbono exposto neste meio adicionado de Mangiferina apresentou uma redução no processo de perda de massa e um comportamento eletroquímico superior em relação às amostras de aço carbono expostas no mesmo meio na ausência dessa substância em estudo. Estes resultados sugerem que a Mangiferina apresenta ação inibidora no processo corrosivo do aço carbono nas condições estudadas. Palavras-chaves: Corrosão, Inibidor, Mangiferina. ABSTRACTTo control or to kinetically inhibit corrosive process has become a major challenge for science. Because of this, researchers have tried to study the various types of interactions between the material and the environment. The use of inhibitors is one of the usual methods of corrosion protection. However, there is growing concern about the toxicity of most corrosion inhibitors. Several studies have been conducted that demonstrate the inhibitory action of plants' extracts on the corrosion of metals. This study aims to verify the inhibitory effect of Mangiferin, substance obtained from the extraction of the plant stem of Mangifera indica L, against the corrosive process in carbon steel. In this study, weight loss tests were carried out assisted by electrochemical techniques in acidic chloride. The results showed that carbon steel exposed in this medium containing Mangiferin had a reduction in mass loss process and a higher electrochemical behavior relative to the carbon steel samples exposed in the same medium in the absence of Mangiferin. These results suggest that Mangiferin shows inhibitory action on the corrosion process of carbon steel in the studied conditions.

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Chitosan/mangiferin particles for Cr(VI) reduction and removal

Cited by 28 publications

References 34 publications

Selective heavy metal removal and water purification by microfluidically-generated chitosan microspheres: Characteristics, modeling and application

Selective heavy metal removal and water purification by microfluidically-generated chitosan microspheres: Characteristics, modeling and application

High molecular weight chitosan based particles for insulin encapsulation obtained via nanospray technology

Estudo da Inibição de Corrosão do aço carbono em ácido clorídricona presença de mangiferina

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