Effect of structure, morphology and chemical composition of Zn-Al, Mg/Zn-Al and Cu/Zn-Al hydrotalcites on their antifungal activity against A. niger

Velázquez-Herrera, Franchescoli D.; Fetter, Geolar; Rosato, Vilma Gabriela; Pereyra, Andrea M.; Basaldella, Elena Isabel

doi:10.1016/j.jece.2018.04.069

Cited by 22 publications

(11 citation statements)

References 33 publications

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“…Elaboration of such material is feasible by inserting Zn 2+ ions in anionic type materials by sorption. The antibacterial activity of Zn 2+ liberated from clays and alginates was recently demonstrated in the biomedical domain against bacteria and fungi [8,9] For the assessment of bioactivity against microfouling organisms, both the inhibition of cell adhesion and growth were evaluated [11]. The strains used for the experimental work are two model species commonly used in biofouling studies: Halamphora coffeaeformis (AC713) and Cylindrotheca closterium (AC170) [12].…”

Section: Introductionmentioning

confidence: 99%

Development of alginate hydrogels active against adhesion of microalgae

et al. 2019

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Microorganisms have the ability to settle on nearly all man-made surfaces in contact with seawater and subsequently to form biofilm. Biofilms control and removal is necessary in the sectors of maritime transport, energy... In this work, we present the development of new pure calcium, zinc or copper alginate, but also mixed Ca/Cu and Ca/Zn alginate hydrogels. These materials have been evaluated for their potential inhibition of adhesion of two key biofilm-forming microalgae Halamphora coffeaeformis and Cylindrotheca closterium). All the tested materials have presented high adhesion inhibition about 80%). Copper-base materials present a high toxicity against H. coffeaeformis. Pure zinc alginate is also toxic for this strain. However, the addition of calcium in zinc alginate leads to the toxicity reduction. The toxicity of these materials differs according to the strains. Consequently, mixed zinc/calcium alginate are efficient at inhibiting microalgal adhesion with a low level of cells toxicity. These alginate hydrogels are promising materials because they are efficient, cheap, easy to develop and eco-friendly.

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Section: Introductionmentioning

confidence: 99%

Development of alginate hydrogels active against adhesion of microalgae

et al. 2019

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“…Figure illustrates the SEM images of the various synthesized hydrotalcites samples. The morphology of Mg 1 Al 1 LDH, Mg 2 Al 1 LDH, Mg 3 Al 1 LDH and Mg 4 Al 1 LDH are of loosely packed layered structure (Figure a‐d), consisting of irregular stacked flakes . At Mg/Al=1, the flakes were agglomerated to be particles of 1–2 μm in diameter.…”

Section: Resultsmentioning

confidence: 76%

Isomerization Kinetics of Glucose to Fructose in Aqueous Solution with Magnesium‐Aluminum Hydrotalcites

Wang

Zhang

et al. 2020

ChemistrySelect

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Mg−Al hydrotalcites for catalyzing glucose isomerization to fructose are prepared. Effects of atom ratios of Mg/Al ranging from 1 to 4 and calcination temperatures from 250–650 °C on catalytic performance were examined systematically. It was found that the hydrotalcite (Mg2Al1LDH) calcined at 450 °C with an atom ratio of Mg/Al=2 is an excellent catalyst for glucose isomerization. Characterizations by SEM, EDS, TEM, XRD, FTIR, TG and BET demonstrated that the formed oxide condensed phase as well as the interaction with the alumina helps promote glucose isomerization reaction due to their appropriate basic sites at high calcination temperature. With Mg2Al1‐450 as the catalyst, kinetic model analysis confirmed that the reaction of glucose isomerization to fructose was an exothermal reversible reaction; both the forward and reverse reactions are quasi‐first‐order reactions with activation energies of 71.82 kJ/mol and 48.15 kJ/mol, respectively, while the side reaction is a zero‐order reaction with an activation energy of 94.22 kJ/mol. Therefore, high isomerization reaction temperature is not beneficial to enhance the yield and selectivity of fructose.

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“…A suitable method, leading to materials with different structure, surface physicochemical and textural properties, can show better performance in antimicrobial activity. It is known that the method of preparation plays an important role in the antimicrobial performance of ZnAl hydroxides [54,55,56]. The reaction conditions of this study were as follows: zinc chloride and aluminum at a ratio of 5:2 were dissolved in 200 mL of distilled water, at a final pH of 10, under nitrogen atmosphere with magnetic stirring at 60 °C and finally, the precipitate was dried at 40 °C.…”

Section: Resultsmentioning

confidence: 99%

Optimization of ZnAl/Chitosan Supra-Nano Hybrid Preparation as Efficient Antibacterial Material

Gohi

Zeng

et al. 2019

IJMS

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The menace of antimicrobial resistance continues to increase and hence the need to discover new antibiotics, especially alternative and effective sources such as hybrid organic-inorganic, organic-organic materials, and other combinations. In this study, an antimicrobial hybrid supra-nano material was prepared by the bi-titration synthesis method of chitosan (CS) and ZnAl layered double hydroxide. Fourier-transform infrared spectrometer (FTIR), thermogravimetric and differential thermal gravimetric (TGA/DTG), ultraviolet-visible (UV-Vis), X-ray diffraction (XRD), and scanning electron microscopy (SEM) analyses indicated that the ZnAl/CS hybrid exhibited low crystallinity with high thermal stability. The results of ZnAl/CS characterization showed the characteristic properties of the individual components ZnAl and CS, indicating a successful preparation of the ZnAl/CS hybrid. The antibacterial tests revealed that the ZnAl/CS hybrid possessed an enhanced antimicrobial effect against both Escherichia coli (E. coli, MTCC 739) and Penicilliumcyclopium (P. cyclopium, AS 3.4513). Under the central composite design (CCD) of the response surface methodology (RSM) tool, the parameters of the hybrid synthesis reaction were optimized and the result obtained was as follows: reaction pH was 11.3, reagent Zn/Al ratio was 3.27, and chitosan concentration was 1.07 g/L. After optimization, it was found that the antibacterial activity of ZnAl/CS was strengthened against E. coli as evidenced by a widening of the inhibition zone of about 41.6%. The antibacterial activity of ZnAl/CS was mainly due to the reactivation of the antibacterial activity of CS associated with the release of Zn2+ and Al3+ metal ions in addition to ZnO, Al2O3, and ZnAl2O4 compounds resulting from the method of preparation.

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Effect of structure, morphology and chemical composition of Zn-Al, Mg/Zn-Al and Cu/Zn-Al hydrotalcites on their antifungal activity against A. niger

Cited by 22 publications

References 33 publications

Development of alginate hydrogels active against adhesion of microalgae

Development of alginate hydrogels active against adhesion of microalgae

Isomerization Kinetics of Glucose to Fructose in Aqueous Solution with Magnesium‐Aluminum Hydrotalcites

Optimization of ZnAl/Chitosan Supra-Nano Hybrid Preparation as Efficient Antibacterial Material

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